D — https://cas.cz | BeaverCheck Audit

Site Health

Score: 68 / 100

Based on 8 categories, 0 sections

Decent speed, but optimizing further could improve engagement.

Several missing protections leave your users and data exposed.

Major barriers for users with disabilities — up to 15% of your audience.

Well-optimized for search — your content is discoverable.

Good server performance with room for optimization.

Mostly compliant — a few items need attention.

Missing metadata means poor previews on social media and search.

Reasonable footprint with room for optimization.

How is this calculated?

The overall score is a weighted average of individual category scores. Categories with more impact on user experience and security carry more weight.

Performance 25%Security 25%Accessibility 15%SEO 10%Infrastructure 10%Compliance 8%Content 5%Sustainability 2%

Weights reflect general web best practices. Individual needs may differ.

How the composite score is calculated

How you compare

CMS · 1644 peers

You 68

Avg 73

At average

0 50 100

Better than 1% of CMS sites

CentOS · 11 peers

You 68

Avg 71

At average

0 50 100

Better than 9% of CentOS sites See full CentOS benchmark →

Top Priorities (5)

Content-Security-Policy header is missing

Security gaps expose your site and users to attacks, eroding trust.

Security › Security Headers

HSTS header is missing

Security gaps expose your site and users to attacks, eroding trust.

Security › Security Headers

No Content-Security-Policy header found

Security gaps expose your site and users to attacks, eroding trust.

Security › Content Security Policy

1 button(s) with no accessible text

Accessibility issues exclude users with disabilities — up to 15% of your potential audience.

Accessibility › Link & Button Quality

90 link(s) with no accessible text

Accessibility issues exclude users with disabilities — up to 15% of your potential audience.

Accessibility › Link & Button Quality

View fix priority matrix

Fix Priority Matrix

5 findings

Impact

Quick Wins

High impact, low effort — start here.

Strategic

High impact, requires investment.

Easy Improvements

Small gains, minimal effort.

Nothing in this quadrant — good news.

Deprioritize

Low impact, high effort — do last.

Nothing in this quadrant — good news.

← Low effort High effort →

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Markdown

[![BeaverCheck](https://beavercheck.com/badge?url=https%3A%2F%2Fcas.cz)](https://beavercheck.com/results/3767d21a-4091-45f7-8687-14243dcf63c2)

HTML

<a href="https://beavercheck.com/results/3767d21a-4091-45f7-8687-14243dcf63c2"><img src="https://beavercheck.com/badge?url=https%3A%2F%2Fcas.cz" alt="BeaverCheck Score"></a>

Image URL

https://beavercheck.com/badge?url=https%3A%2F%2Fcas.cz

This badge auto-updates with your latest scan result.

What fixing these means

Your site has several issues that may be affecting user experience and business outcomes. Accessibility issues exclude users who rely on assistive technology — an estimated 15% of your potential audience. Addressing the critical issues below would have the most immediate impact on your user trust.

3 security gaps detected — browsers may warn visitors about your site.

2 accessibility issues exclude users who rely on assistive technology.

Could reach Estimate based on resolving critical issues

Conversion Barriers

1 critical 8 warning

9 barrier(s) likely increasing bounce by ~27%.

Speed (2)

Page takes 8.2s to load

+12% bounce

Users abandon at ~3s — you're 5.7s over the 2.5s threshold

Fix: Optimize render-blocking resources, preload the hero image, and compress images

High main-thread blocking time

+2% bounce

Page is non-interactive for 496ms after first paint

Fix: Defer third-party scripts and split large bundles

Trust (2)

No HSTS header

+1% bounce

Returning visitors are briefly exposed to downgrade attacks on first request

Fix: Set Strict-Transport-Security: max-age=31536000; includeSubDomains

No Content-Security-Policy header

+1% bounce

Higher XSS blast radius — one compromised script can exfiltrate the checkout form

Fix: Ship a reporting-only CSP first, then enforce once violations are clean

Content (2)

No Open Graph tags

+2% bounce

Links shared on LinkedIn / Slack / Facebook show bare URLs — referral clicks drop

Fix: Add og:title, og:description, og:image, og:url to the page head

No structured data

+2% bounce

No rich-result eligibility in Google — lower SERP CTR vs competitors with stars and prices

Fix: Add JSON-LD for your page type (Product, Article, FAQPage, LocalBusiness, …)

Navigation (3)

90 link(s) with generic text ("click here", "read more")

+1% bounce

Screen-reader users navigating by link list see no context — and search engines can't infer relevance

Fix: Rewrite with descriptive phrases that identify the destination

No skip-to-content link

+1% bounce

Keyboard and screen-reader users must tab through the entire header on every page

Fix: Add a visible-on-focus <a href="#main">Skip to content</a> as the first focusable element

1 broken link(s) on the page

+2% bounce

Clicks land on 404s — trust drops and the session often ends

Fix: Fix or remove the broken destinations surfaced on the Content tab

Preliminary CRO audit — each barrier links to the tab with detailed analysis.

Return on Investment

CZK 4,950 investment → CZK 57,289/month returns + EUR 120,500,000 risk avoided

Payback period: < 1 month First-year ROI: +13788%

Investment

CZK 4,950

4h · 5 findings

Monthly returns

CZK 57,289 /mo

~CZK 687,463 / year

Conversions recovered CZK 57,276
Bandwidth savings CZK 13

Regulatory risk avoided

EUR 120,500,000

if kept compliant

ePrivacy Directive EUR 100,000,000
GDPR EUR 20,000,000
EAA EUR 500,000

Payback period

0 12mo 24mo

CZK 1,650 — in quick wins — start here for the fastest payback

Figures combine localized regulatory fine ceilings, search/conversion value priced against local CPC, and bandwidth waste estimates. Results depend on implementation quality and audience composition. Not legal or financial advice.

Full methodology & sources

Estimated Remediation Cost

Kč4,950

4.5 developer hours at Kč1100/hr

Based on Czech Republic rates (Kč1100/hr)

Quick wins

Kč1,650 3 fixes in ~90 minutes

Start here for the best return on investment

Cost by category

Cost by effort level

Adjust assumptions

Custom rate

Kč /hr

Rates reflect fully-loaded developer cost including overhead

How developer rates are sourced

What Inaction Is Costing You

CZK 10,041,680 / month at risk

~CZK 120,500,155 / year if left unfixed

Compliance Risk

€120,500,000

ePrivacy DirectiveGDPREAA

No privacy policy link detected
GDPR: EUR 10,000 – EUR 20,000,000
Trackers detected but no cookie policy found
GDPR: EUR 5,000 – EUR 10,000,000
Trackers detected but no cookie policy found
GDPR: EUR 10,000 – EUR 20,000,000

+8 more

Bandwidth Waste

CZK 13 /mo

6951.1 MB/mo × 1.860 CZK/GB

Optimize transfer: save ~695 KB per page load
Saves CZK 13/mo

Compliance figures represent the statutory maximum fine for the most severe triggered category, capped per regulation — not the sum of per-finding penalties. Based on published regulatory fine ranges. This is not legal advice.

Compliance methodology · SEO assumptions · Bandwidth model

Your performance is already good — improvements may show diminishing returns

Monthly visitors

Unique monthly visitors from your analytics

Conversion rate (%)

Purchases, signups, or key actions

Avg. order value

Optional — for revenue estimation

additional conversions/month

more engaged visitors from reduced bounce

potential monthly revenue

Current bounce (est.)

After fixes (est.)

Estimated bounce reduction

Fix 5 critical issues to capture this value

How this is calculated

Based on Google/Deloitte research ("Milliseconds Make Millions") showing a ~7% bounce rate increase per additional second of LCP above the 2.5s "Good" threshold.

Your site's LCP: → estimated after fixes.

These are estimates based on industry research — actual results vary

Bounce-rate model & assumptions

Your data stays in your browser — nothing is sent to our servers

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Lighthouse Scores

Industry-standard audits powered by Google Lighthouse.

Performance

Accessibility

Best Practices

100

SEO

Core Web Vitals

Key metrics that affect user experience.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

6.98 s

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

8.18 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

496 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.000

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

9.37 s

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

14.09 s

Detailed Report

Audit breakdown by category with detailed findings.

Performance

Insights

Remove large, duplicate JavaScript modules from bundles to reduce unnecessary bytes consumed by network activity.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Polyfills and transforms enable older browsers to use new JavaScript features. However, many aren't necessary for modern browsers. Consider modifying your JavaScript build process to not transpile Baseline features, unless you know you must support older browsers. Learn why most sites can deploy ES6+ code without transpiling

Why this matters

Shipping ES5 transpiled code to modern browsers wastes bytes — every user with an evergreen browser pays for compatibility you don't need.

Learn more ▾

Most users today run browsers that natively support ES6+, async/await, optional chaining, and the rest of modern JavaScript. Transpiling to ES5 'just in case' adds 20-40% to your bundle for no benefit. Configure your build to target a modern browserslist, or ship a differential bundle pair (modern + legacy) with the module/nomodule pattern.

Source: Google web.dev / Lighthouse

3rd party code can significantly impact load performance. Reduce and defer loading of 3rd party code to prioritize your page's content.

Why this matters

Performance issues directly impact user engagement and conversion rates.

A long cache lifetime can speed up repeat visits to your page. Learn more about caching.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Request	Cache TTL	Transfer Size
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	159.2 KiB
/export/system/modules/cz.nelasoft.opencms.media/resource...	0.0 ms	79.7 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	74.0 KiB
/export/system/modules/cz.nelasoft.opencms.avcr/resources...	0.0 ms	71.4 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	67.0 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	53.8 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	51.2 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	47.6 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	43.7 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	42.4 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	41.0 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	36.1 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	36.0 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	36.0 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	35.5 KiB
/export/system/modules/cz.nelasoft.opencms.avcr/resources...	0.0 ms	33.5 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	33.5 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	30.2 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	30.1 KiB
/export/system/modules/cz.nelasoft.opencms.avcr/resources...	0.0 ms	29.8 KiB
/system/modules/cz.nelasoft.opencms.avcr/resources/js/jqu...	86400.0 s	74.3 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	29.1 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	28.7 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	28.6 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	28.3 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	28.0 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	26.4 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	25.6 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	25.5 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	24.7 KiB
/export/system/modules/cz.nelasoft.opencms.media/resource...	0.0 ms	24.4 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	24.1 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	23.8 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	22.9 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	21.0 KiB
/system/modules/cz.osw.opencms.types/resources/slick-phot...	86400.0 s	52.3 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	20.8 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	20.8 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	20.3 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	19.4 KiB
/export/system/modules/cz.osw.opencms.types/elements/cook...	0.0 ms	18.8 KiB
/export/system/modules/cz.nelasoft.opencms.avcr/resources...	0.0 ms	15.8 KiB
/.content/galerie-obrazku/aktuality/2026/2026_04_21_Radim...	86400.0 s	37.9 KiB
/system/modules/cz.nelasoft.opencms.avcr/resources/js/owl...	86400.0 s	23.7 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	8.4 KiB
/system/modules/cz.nelasoft.opencms.avcr/resources/js/coo...	86400.0 s	20.8 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	8.1 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	8.1 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	8.0 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	7.6 KiB
/system/modules/cz.osw.opencms.types/elements/cookies/coo...	86400.0 s	18.8 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	7.3 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	7.3 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	7.0 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	6.9 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	6.8 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	6.7 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	6.4 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	6.3 KiB
www.avcr.cz/system/modules/cz.nelasoft.opencms.avcr/resources/js/modernizr.js	86400.0 s	15.2 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	6.0 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	5.6 KiB
/export/system/modules/cz.osw.opencms.types/resources/sli...	0.0 ms	5.0 KiB
/export/system/modules/cz.nelasoft.opencms.avcr/resources...	0.0 ms	3.0 KiB
/export/system/modules/cz.osw.opencms.types/resources/sli...	0.0 ms	2.8 KiB
/system/modules/cz.nelasoft.opencms.avcr/resources/js/jqu...	86400.0 s	6.4 KiB
/export/system/modules/cz.osw.opencms.types/resources/sli...	0.0 ms	2.2 KiB
www.avcr.cz/system/modules/cz.nelasoft.opencms.avcr/resources/js/dropdown.js	86400.0 s	5.0 KiB
/export/system/modules/cz.nelasoft.opencms.avcr/resources...	0.0 ms	1.9 KiB
/export/system/modules/cz.nelasoft.opencms.avcr/resources...	0.0 ms	1.7 KiB
/export/system/modules/cz.osw.opencms.types/resources/sli...	0.0 ms	1.6 KiB
/export/system/modules/cz.nelasoft.opencms.avcr/resources...	0.0 ms	392 B

Your first network request is the most important. Reduce its latency by avoiding redirects, ensuring a fast server response, and enabling text compression.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Consider setting font-display to swap or optional to ensure text is consistently visible. swap can be further optimized to mitigate layout shifts with font metric overrides.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Est Savings
/export/system/modules/cz.osw.opencms.types/resources/sli...	160 ms
/font-awesome/4.6.3/fonts/fontawesome-webfont.woff2?v=4.6.3	20 ms

A forced reflow occurs when JavaScript queries geometric properties (such as offsetWidth) after styles have been invalidated by a change to the DOM state. This can result in poor performance. Learn more about forced reflows and possible mitigations.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:source label:Top function call valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]

items: [map[reflowTime:36.265 source:map[column:4688 line:3 type:source-location url:https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js urlProvider:network]]]

headings: [map[key:source label:Source valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]

items: [map[reflowTime:20.29 source:map[column:24594 line:2 type:source-location url:https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js urlProvider:network]] map[reflowTime:125.551 source:map[column:30738 line:2 type:source-location url:https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js urlProvider:network]] map[reflowTime:0.663 source:map[column:27566 line:2 type:source-location url:https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js urlProvider:network]] map[reflowTime:0.171 source:map[column:27658 line:2 type:source-location url:https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js urlProvider:network]] map[reflowTime:6.441 source:map[column:24616 line:2 type:source-location url:https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js urlProvider:network]] map[reflowTime:0.031 source:map[type:text value:[unattributed]]] map[reflowTime:0.081 source:map[column:387 line:0 type:source-location url:https://osw-analytics3.avcr.cz/js/plausible.manual.file-downloads.js urlProvider:network]]]

Reducing the download time of images can improve the perceived load time of the page and LCP. Learn more about optimizing image size

Why this matters

Performance issues directly impact user engagement and conversion rates.

	URL	Resource Size	Est Savings
div.slide-item > a > div.img-wrapper > img.img-fluid `div.slide-item > a > div.img-wrapper > img.img-fluid`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	158.9 KiB	133.8 KiB
Na hradě Štamberk se zřejmě bydlelo pouhých 150 let. `div.content > div.thumbs > div.bigThumb > img`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	73.7 KiB	60.5 KiB
Hlavní dominantu Vyšehradu dnes tvoří kapitulní chrám sv. apoštolů Petra a Pavl… `div.content > div.thumbs > div.bigThumb > img`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	53.5 KiB	40.3 KiB
Na okraji Kroměříže se nacházejí dva Medkovy rybníky. Invazní sumeček černý se … `div.content > div.thumbs > div.bigThumb > img`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	50.8 KiB	37.6 KiB
Akademie věd České republiky `div.footer > div.logo > a > img`	/export/system/modules/cz.nelasoft.opencms.avcr/resources...	29.5 KiB	28.2 KiB
Centrum translačního výzkumu PharmTheon se nachází na pražské Harfě. Disponuje … `div.content > div.thumbs > div.bigThumb > img`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	40.7 KiB	27.5 KiB
Letiště Roudnice nad Labem. Odsud startovaly lety pro veřejnost v rámci Archeol… `div.content > div.thumbs > div.bigThumb > img`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	33.2 KiB	20.0 KiB
div.video-entry-inner > div.image > a > img.img-responsive `div.video-entry-inner > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	47.2 KiB	17.3 KiB
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	42.1 KiB	12.2 KiB
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/.content/galerie-obrazku/aktuality/2026/2026_04_21_Radim...	37.6 KiB	7.7 KiB
Sumeček černý pochází původně ze Severní Ameriky, do Evropy se dostal v 19. sto… `div.content > div.thumbs > div.thumb > img`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	8.1 KiB	6.7 KiB
Z hradu se zachoval kus vysoké jižní zdi, částečně odhalené stěny dvouprostorov… `div.content > div.thumbs > div.thumb > img`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	7.8 KiB	6.5 KiB
V roce 2003 povýšil papež Jan Pavel II. vyšehradský kapitulní chrám na papežsko… `div.content > div.thumbs > div.thumb > img`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	7.8 KiB	6.5 KiB
Zřícenina se nachází u Telče, která je nejen kulturní památkou zapsanou na Sezn… `div.content > div.thumbs > div.thumb > img`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	7.7 KiB	6.4 KiB
Čas jeho slávy se dá ohraničit poslední čtvrtinou 13. století a husitskými válk… `div.content > div.thumbs > div.thumb > img`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	7.3 KiB	6.0 KiB
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	35.7 KiB	5.8 KiB
Kromě letadla s pilotem potřebuje „nebeský“ archeolog i další vybavení. Dříve, … `div.content > div.thumbs > div.thumb > img`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	7.0 KiB	5.7 KiB
Pro vodní ekosystémy představuje tato rybka velkou hrozbu. Je všežravá, nemá mn… `div.content > div.thumbs > div.thumb > img`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	7.0 KiB	5.6 KiB
„Chovatelé mají s tímto druhem velký problém. Finanční ztráty se dají vyčíslit … `div.content > div.thumbs > div.thumb > img`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	6.7 KiB	5.4 KiB
V současné době výzkumníci rozvíjejí několik projektů, které se zaměřují předev… `div.content > div.thumbs > div.thumb > img`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	6.6 KiB	5.3 KiB
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	35.1 KiB	5.2 KiB
V kapli sv. Klimenta uvnitř chrámu se nachází románský sarkofág (v pravém dolní… `div.content > div.thumbs > div.thumb > img`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	6.5 KiB	5.2 KiB
Pod presbytářem kapitulního chrámu je dobře zachovaná románská apsida (půlkruho… `div.content > div.thumbs > div.thumb > img`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	6.4 KiB	5.1 KiB
Návštěvníci měli možnost zúčastnit se letu s nestorem české letecké archeologie… `div.content > div.thumbs > div.thumb > img`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	6.1 KiB	4.8 KiB
Při přenosu léků z laboratoře do klinické praxe je klíčová rychlost a preciznos… `div.content > div.thumbs > div.thumb > img`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	6.0 KiB	4.7 KiB
Pomocí NMR spektroskopie vědci v PharmTheonu zkoumají, jak přesně vypadají a fu… `div.content > div.thumbs > div.thumb > img`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	5.7 KiB	4.4 KiB

Each subpart has specific improvement strategies. Ideally, most of the LCP time should be spent on loading the resources, not within delays.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:label label:Subpart valueType:text] map[key:duration label:Duration valueType:ms]]

items: [map[duration:2298.3490001220703 label:Time to first byte subpart:timeToFirstByte] map[duration:1460.7989998779296 label:Element render delay subpart:elementRenderDelay]]

lhId: page-26-DIV

nodeLabel: O lesích a biodiverzitě s ekologem a botanikem Radimem Hédlem

path: 1,HTML,1,BODY,1,DIV,0,DIV,1,DIV,0,DIV,0,DIV,0,DIV,0,DIV,1,DIV,0,DIV,1,DIV,0,A,1,DIV,0,DIV

selector: div.slide-item > a > div.slide-text > div.slide-caption

snippet: <div class="slide-caption">

Avoid chaining critical requests by reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load.

Why this matters

Performance issues directly impact user engagement and conversion rates.

description: [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints help the browser establish a connection earlier in the page load, saving time when the first request for that origin is made. The following are the origins that the page preconnected to.

title: Preconnected origins

value: no origins were preconnected

description: Add [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints to your most important origins, but try to use no more than 4.

title: Preconnect candidates

value: No additional origins are good candidates for preconnecting

Requests are blocking the page's initial render, which may delay LCP. Deferring or inlining can move these network requests out of the critical path.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Transfer Size	Duration
/system/modules/cz.osw.opencms.types/resources/slick-phot...	52.3 KiB	1.2 s
/export/system/modules/cz.nelasoft.opencms.media/resource...	79.7 KiB	2.4 s
/system/modules/cz.nelasoft.opencms.avcr/resources/js/jqu...	74.3 KiB	2.1 s
/system/modules/cz.nelasoft.opencms.avcr/resources/js/jqu...	6.4 KiB	307 ms
www.avcr.cz/system/modules/cz.nelasoft.opencms.avcr/resources/js/dropdown.js	5.0 KiB	307 ms
/system/modules/cz.nelasoft.opencms.avcr/resources/js/owl...	23.7 KiB	910 ms
/export/system/modules/cz.nelasoft.opencms.media/resource...	24.4 KiB	1.2 s
www.avcr.cz/system/modules/cz.nelasoft.opencms.avcr/resources/js/modernizr.js	15.2 KiB	608 ms
/export/system/modules/cz.nelasoft.opencms.avcr/resources...	15.8 KiB	1.5 s
/export/system/modules/cz.nelasoft.opencms.avcr/resources...	33.5 KiB	2.1 s
/export/system/modules/cz.nelasoft.opencms.avcr/resources...	392 B	307 ms
/export/system/modules/cz.osw.opencms.types/resources/sli...	5.0 KiB	307 ms
/export/system/modules/cz.nelasoft.opencms.avcr/resources...	1.9 KiB	910 ms
/export/system/modules/cz.nelasoft.opencms.avcr/resources...	3.0 KiB	910 ms
/export/system/modules/cz.nelasoft.opencms.avcr/resources...	1.7 KiB	910 ms
/export/system/modules/cz.nelasoft.opencms.avcr/resources...	71.4 KiB	2.7 s
/export/system/modules/cz.osw.opencms.types/resources/sli...	2.2 KiB	307 ms
ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js	33.4 KiB	2.0 s
netdna.bootstrapcdn.com/font-awesome/4.6.3/css/font-awesome.css	7.4 KiB	1.1 s

HTTP/2 and HTTP/3 offer many benefits over HTTP/1.1, such as multiplexing. Learn more about using modern HTTP.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Protocol
www.avcr.cz/cs/	http/1.1
/export/system/modules/cz.nelasoft.opencms.avcr/resources...	http/1.1
/export/system/modules/cz.nelasoft.opencms.avcr/resources...	http/1.1
/export/system/modules/cz.nelasoft.opencms.avcr/resources...	http/1.1
/export/system/modules/cz.nelasoft.opencms.avcr/resources...	http/1.1
/export/system/modules/cz.nelasoft.opencms.avcr/resources...	http/1.1
/export/system/modules/cz.nelasoft.opencms.avcr/resources...	http/1.1
/export/system/modules/cz.nelasoft.opencms.avcr/resources...	http/1.1
/export/system/modules/cz.osw.opencms.types/resources/sli...	http/1.1
/export/system/modules/cz.nelasoft.opencms.media/resource...	http/1.1
/system/modules/cz.nelasoft.opencms.avcr/resources/js/jqu...	http/1.1
/export/system/modules/cz.nelasoft.opencms.media/resource...	http/1.1
www.avcr.cz/system/modules/cz.nelasoft.opencms.avcr/resources/js/modernizr.js	http/1.1
/system/modules/cz.nelasoft.opencms.avcr/resources/js/owl...	http/1.1
www.avcr.cz/system/modules/cz.nelasoft.opencms.avcr/resources/js/dropdown.js	http/1.1
/system/modules/cz.nelasoft.opencms.avcr/resources/js/jqu...	http/1.1
/system/modules/cz.osw.opencms.types/resources/slick-phot...	http/1.1
/export/system/modules/cz.nelasoft.opencms.avcr/resources...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/.content/galerie-obrazku/aktuality/2026/2026_04_21_Radim...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/system/modules/cz.osw.opencms.types/elements/cookies/coo...	http/1.1
/system/modules/cz.nelasoft.opencms.avcr/resources/js/coo...	http/1.1
/export/system/modules/cz.osw.opencms.types/resources/sli...	http/1.1
/export/system/modules/cz.osw.opencms.types/resources/sli...	http/1.1
/export/system/modules/cz.osw.opencms.types/resources/sli...	http/1.1
/export/system/modules/cz.osw.opencms.types/elements/cook...	http/1.1
www.avcr.cz/favicon.ico	http/1.1

These insights are also available in the Chrome DevTools Performance Panel - record a trace to view more detailed information.

Redirects introduce additional delays before the page can be loaded. Learn how to avoid page redirects.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 2.4 s

URL	Time Spent
cas.cz/	1.2 s
www.avcr.cz/	1.2 s
www.avcr.cz/cs/	0.0 ms

Time to Interactive is the amount of time it takes for the page to become fully interactive. Learn more about the Time to Interactive metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

TTI

The maximum potential First Input Delay that your users could experience is the duration of the longest task. Learn more about the Maximum Potential First Input Delay metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Diagnostics

Minifying CSS files can reduce network payload sizes. Learn how to minify CSS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 300 ms 33.5 KiB

URL	Transfer Size	Est Savings
/export/system/modules/cz.nelasoft.opencms.avcr/resources...	71.4 KiB	21.5 KiB
/export/system/modules/cz.nelasoft.opencms.avcr/resources...	33.5 KiB	5.1 KiB
/export/system/modules/cz.nelasoft.opencms.media/resource...	24.4 KiB	4.4 KiB
/export/system/modules/cz.nelasoft.opencms.avcr/resources...	15.8 KiB	2.6 KiB

Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. Learn how to reduce unused CSS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 600 ms 120.9 KiB

URL	Transfer Size	Est Savings
/export/system/modules/cz.nelasoft.opencms.avcr/resources...	71.1 KiB	64.9 KiB
/export/system/modules/cz.nelasoft.opencms.media/resource...	24.1 KiB	24.1 KiB
/export/system/modules/cz.nelasoft.opencms.avcr/resources...	33.2 KiB	16.3 KiB
/export/system/modules/cz.nelasoft.opencms.avcr/resources...	15.5 KiB	15.5 KiB

Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. Learn how to reduce unused JavaScript.

Why this matters

Multi-megabyte JavaScript bundles delay every interactive feature on the page.

Learn more ▾

This is the Lighthouse audit fired when too much JS is shipped relative to what executes. The fix isn't a config flag — it requires bundle analysis (webpack-bundle-analyzer, rollup-plugin-visualizer), splitting routes into chunks, lazy-loading off-screen components, and removing unused dependencies. Fundamentally different from minification: minifying reduces byte count, this reduces what's downloaded at all.

Source: Google web.dev / Lighthouse

Estimated savings: 910 ms 237.7 KiB

URL	Transfer Size	Est Savings
www.googletagmanager.com/gtag/js?id=G-ETQEE59TKV	156.8 KiB	85.7 KiB
/export/system/modules/cz.nelasoft.opencms.media/resource...	79.3 KiB	65.3 KiB
/system/modules/cz.nelasoft.opencms.avcr/resources/js/jqu...	74.0 KiB	65.1 KiB
/system/modules/cz.nelasoft.opencms.avcr/resources/js/owl...	23.3 KiB	21.6 KiB

Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to minimize main-thread work

Why this matters

Performance issues directly impact user engagement and conversion rates.

Category	Time Spent
Style & Layout	1.1 s
Script Evaluation	1.1 s
Other	985 ms
Rendering	305 ms
Parse HTML & CSS	134 ms
Script Parsing & Compilation	109 ms
Garbage Collection	7.6 ms

Minifying JavaScript files can reduce payload sizes and script parse time. Learn how to minify JavaScript.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 0.0 ms 11.1 KiB

URL	Transfer Size	Est Savings
/system/modules/cz.nelasoft.opencms.avcr/resources/js/coo...	20.5 KiB	11.1 KiB

Set an explicit width and height on image elements to reduce layout shifts and improve CLS. Learn how to set image dimensions

Why this matters

Performance issues directly impact user engagement and conversion rates.

	URL
div.slide-item > a > div.img-wrapper > img.img-fluid `div.slide-item > a > div.img-wrapper > img.img-fluid`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/.content/galerie-obrazku/aktuality/2026/2026_04_21_Radim...
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.video-entry-inner > div.image > a > img.img-responsive `div.video-entry-inner > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.video-entry-inner > div.image > a > img.img-responsive `div.video-entry-inner > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.video-entry-inner > div.image > a > img.img-responsive `div.video-entry-inner > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.video-entry-inner > div.image > a > img.img-responsive `div.video-entry-inner > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.video-entry-inner > div.image > a > img.img-responsive `div.video-entry-inner > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.video-entry-inner > div.image > a > img.img-responsive `div.video-entry-inner > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.video-entry-inner > div.image > a > img.img-responsive `div.video-entry-inner > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.video-entry-inner > div.image > a > img.img-responsive `div.video-entry-inner > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.video-entry-inner > div.image > a > img.img-responsive `div.video-entry-inner > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.video-entry-inner > div.image > a > img.img-responsive `div.video-entry-inner > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.video-entry-inner > div.image > a > img.img-responsive `div.video-entry-inner > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...

More information about the performance of your application. These numbers don't directly affect the Performance score.

●Layout shift culprits

●Optimize DOM size

●Optimize viewport for mobile

●Avoids enormous network payloads Total size was 2,263 KiB

●JavaScript execution time 1.1 s

●Avoid long main-thread tasks 10 long tasks found

●Avoid non-composited animations 1 animated element found

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 160 ms

●Server Backend Latencies 40 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Initial server response time was short Root document took 360 ms

○INP breakdown

○LCP request discovery

○User Timing marks and measures

○Avoid large layout shifts

Accessibility

These checks highlight opportunities to improve the accessibility of your web app. Automatic detection can only detect a subset of issues and does not guarantee the accessibility of your web app, so manual testing is also encouraged.

Names and labels

When a button doesn't have an accessible name, screen readers announce it as "button", making it unusable for users who rely on screen readers. Learn how to make buttons more accessible.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.header > div.header-base > div.header-toggle > button `div.header > div.header-base > div.header-toggle > button`

Link text (and alternate text for images, when used as links) that is discernible, unique, and focusable improves the navigation experience for screen reader users. Learn how to make links accessible.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div#list-iems-2029cc38-683b-11e9-ade2-005056bf6eb8 > div.col-xs-12 > div.image > a `div#list-iems-2029cc38-683b-11e9-ade2-005056bf6eb8 > div.col-xs-12 > div.image > a`
div#list-iems-2029cc38-683b-11e9-ade2-005056bf6eb8 > div.col-xs-12 > div.image > a `div#list-iems-2029cc38-683b-11e9-ade2-005056bf6eb8 > div.col-xs-12 > div.image > a`
div#list-iems-2029cc38-683b-11e9-ade2-005056bf6eb8 > div.col-xs-12 > div.image > a `div#list-iems-2029cc38-683b-11e9-ade2-005056bf6eb8 > div.col-xs-12 > div.image > a`
div#list-iems-2029cc38-683b-11e9-ade2-005056bf6eb8 > div.col-xs-12 > div.image > a `div#list-iems-2029cc38-683b-11e9-ade2-005056bf6eb8 > div.col-xs-12 > div.image > a`
div#list-iems-7dce9a82-51c2-11ec-bca5-005056bf6eb8 > div.col-xs-12 > div.image > a `div#list-iems-7dce9a82-51c2-11ec-bca5-005056bf6eb8 > div.col-xs-12 > div.image > a`
div#list-iems-7dce9a82-51c2-11ec-bca5-005056bf6eb8 > div.col-xs-12 > div.image > a `div#list-iems-7dce9a82-51c2-11ec-bca5-005056bf6eb8 > div.col-xs-12 > div.image > a`
div#list-iems-7dce9a82-51c2-11ec-bca5-005056bf6eb8 > div.col-xs-12 > div.image > a `div#list-iems-7dce9a82-51c2-11ec-bca5-005056bf6eb8 > div.col-xs-12 > div.image > a`
div#list-iems-7dce9a82-51c2-11ec-bca5-005056bf6eb8 > div.col-xs-12 > div.image > a `div#list-iems-7dce9a82-51c2-11ec-bca5-005056bf6eb8 > div.col-xs-12 > div.image > a`
div.video-entry > div.video-entry-inner > div.image > a `div.video-entry > div.video-entry-inner > div.image > a`
div.video-entry > div.video-entry-inner > div.image > a.play-button-videorep `div.video-entry > div.video-entry-inner > div.image > a.play-button-videorep`
div > div.col-xs-12 > div.image > a `div > div.col-xs-12 > div.image > a`
div.content > div.title > h3 > a `div.content > div.title > h3 > a`

These are opportunities to improve the semantics of the controls in your application. This may enhance the experience for users of assistive technology, like a screen reader.

Best practices

Touch targets with sufficient size and spacing help users who may have difficulty targeting small controls to activate the targets. Learn more about touch targets.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Část obsahu šířena pod licencí Creative commons `div.wrapper-footer > div.footer > div.footer-quote > a`
Prohlášení o přístupnosti `div.service-menu > ul > li > a`
Zpracování osobních údajů `div.service-menu > ul > li > a`

These items highlight common accessibility best practices.

○Interactive controls are keyboard focusable

○Interactive elements indicate their purpose and state

○The page has a logical tab order

○Visual order on the page follows DOM order

○User focus is not accidentally trapped in a region

○The user's focus is directed to new content added to the page

○HTML5 landmark elements are used to improve navigation

○Offscreen content is hidden from assistive technology

○Custom controls have associated labels

○Custom controls have ARIA roles

●`[aria-*]` attributes match their roles

●`[aria-hidden="true"]` is not present on the document `<body>`

●`[role]`s have all required `[aria-*]` attributes

●Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.

●`[role]`s are contained by their required parent element

●`[role]` values are valid

●`[aria-*]` attributes have valid values

●`[aria-*]` attributes are valid and not misspelled

●Image elements have `[alt]` attributes

●Form elements have associated labels

●`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.

●ARIA attributes are used as specified for the element's role

●Elements with `role="dialog"` or `role="alertdialog"` have accessible names.

●`[aria-hidden="true"]` elements do not contain focusable descendents

●Elements use only permitted ARIA attributes

●Background and foreground colors have a sufficient contrast ratio

●Document has a `<title>` element

●`<html>` element has a `[lang]` attribute

●`<html>` element has a valid value for its `[lang]` attribute

●Links are distinguishable without relying on color.

●Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).

●List items (`<li>`) are contained within `<ul>`, `<ol>` or `<menu>` parent elements

●No element has a `[tabindex]` value greater than 0

●Heading elements appear in a sequentially-descending order

●Document has a main landmark.

●Deprecated ARIA roles were not used

●All heading elements contain content.

●Identical links have the same purpose.

●Elements with visible text labels have matching accessible names.

○`[accesskey]` values are unique

○`button`, `link`, and `menuitem` elements have accessible names

○ARIA input fields have accessible names

○ARIA `meter` elements have accessible names

○ARIA `progressbar` elements have accessible names

○Elements with the `role=text` attribute do not have focusable descendents.

○ARIA toggle fields have accessible names

○ARIA `tooltip` elements have accessible names

○ARIA `treeitem` elements have accessible names

○The page contains a heading, skip link, or landmark region

○`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.

○Definition list items are wrapped in `<dl>` elements

○ARIA IDs are unique

○No form fields have multiple labels

○`<frame>` or `<iframe>` elements have a title

○`<html>` element has an `[xml:lang]` attribute with the same base language as the `[lang]` attribute.

○Input buttons have discernible text.

○`<input type="image">` elements have `[alt]` text

○The document does not use `<meta http-equiv="refresh">`

○`<object>` elements have alternate text

○Select elements have associated label elements.

○Skip links are focusable.

○Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.

○`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.

○`[lang]` attributes have a valid value

○`<video>` elements contain a `<track>` element with `[kind="captions"]`

○Tables have different content in the summary attribute and `<caption>`.

○Uses ARIA roles only on compatible elements

○Image elements do not have `[alt]` attributes that are redundant text.

○Tables use `<caption>` instead of cells with the `[colspan]` attribute to indicate a caption.

○`<td>` elements in a large `<table>` have one or more table headers.

Best Practices

User Experience

Image natural dimensions should be proportional to the display size and the pixel ratio to maximize image clarity. Learn how to provide responsive images.

Why this matters

Performance issues directly impact user engagement and conversion rates.

	URL	Displayed size	Actual size	Expected size
Akademie věd České republiky `div.header-base > div.logo > a > img`	/export/system/modules/cz.nelasoft.opencms.avcr/resources...	167 x 45	167 x 45	251 x 68

●Uses HTTPS

●Avoids deprecated APIs

●Avoids third-party cookies

●Allows users to paste into input fields

●Avoids requesting the geolocation permission on page load

●Avoids requesting the notification permission on page load

●Displays images with correct aspect ratio

●Page has the HTML doctype

●Properly defines charset

●No browser errors logged to the console

●No issues in the `Issues` panel in Chrome Devtools

●Ensure CSP is effective against XSS attacks

●Use a strong HSTS policy

●Ensure proper origin isolation with COOP

●Mitigate clickjacking with XFO or CSP

●Mitigate DOM-based XSS with Trusted Types

●Detected JavaScript libraries

●Page has valid source maps

○Redirects HTTP traffic to HTTPS

100

SEO

These checks ensure that your page is following basic search engine optimization advice. There are many additional factors Lighthouse does not score here that may affect your search ranking, including performance on Core Web Vitals. Learn more about Google Search Essentials.

○Structured data is valid

●Page isn’t blocked from indexing

●Document has a `<title>` element

●Document has a meta description

●Page has successful HTTP status code

●Links have descriptive text

●Links are crawlable

●robots.txt is valid

●Image elements have `[alt]` attributes

●Document has a valid `hreflang`

○Document has a valid `rel=canonical`

Lighthouse Scores

Industry-standard audits powered by Google Lighthouse. — Desktop

Performance

Accessibility

100

Best Practices

100

SEO

Core Web Vitals

Key metrics that affect user experience. — Desktop

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

3.31 s

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

3.88 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

0 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.042

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

4.08 s

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

3.88 s

Detailed Report

Audit breakdown by category with detailed findings.

Performance

Insights

Remove large, duplicate JavaScript modules from bundles to reduce unnecessary bytes consumed by network activity.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Why this matters

Shipping ES5 transpiled code to modern browsers wastes bytes — every user with an evergreen browser pays for compatibility you don't need.

Learn more ▾

Source: Google web.dev / Lighthouse

3rd party code can significantly impact load performance. Reduce and defer loading of 3rd party code to prioritize your page's content.

Why this matters

Performance issues directly impact user engagement and conversion rates.

A long cache lifetime can speed up repeat visits to your page. Learn more about caching.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Request	Cache TTL	Transfer Size
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	159.2 KiB
/export/system/modules/cz.nelasoft.opencms.media/resource...	0.0 ms	79.7 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	74.0 KiB
/export/system/modules/cz.nelasoft.opencms.avcr/resources...	0.0 ms	71.4 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	67.0 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	53.8 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	51.2 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	47.6 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	43.7 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	42.4 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	41.0 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	36.1 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	36.0 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	36.0 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	35.5 KiB
/export/system/modules/cz.nelasoft.opencms.avcr/resources...	0.0 ms	33.5 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	33.5 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	30.2 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	30.1 KiB
/export/system/modules/cz.nelasoft.opencms.avcr/resources...	0.0 ms	29.8 KiB
/system/modules/cz.nelasoft.opencms.avcr/resources/js/jqu...	86400.0 s	74.3 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	29.1 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	28.7 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	28.6 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	28.3 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	28.0 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	26.4 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	25.6 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	25.5 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	24.7 KiB
/export/system/modules/cz.nelasoft.opencms.media/resource...	0.0 ms	24.4 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	24.1 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	23.8 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	22.9 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	21.0 KiB
/system/modules/cz.osw.opencms.types/resources/slick-phot...	86400.0 s	52.3 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	20.8 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	20.8 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	20.3 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	19.4 KiB
/export/system/modules/cz.osw.opencms.types/elements/cook...	0.0 ms	18.8 KiB
/export/system/modules/cz.nelasoft.opencms.avcr/resources...	0.0 ms	15.8 KiB
/.content/galerie-obrazku/aktuality/2026/2026_04_21_Radim...	86400.0 s	37.9 KiB
/system/modules/cz.nelasoft.opencms.avcr/resources/js/owl...	86400.0 s	23.7 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	8.4 KiB
/system/modules/cz.nelasoft.opencms.avcr/resources/js/coo...	86400.0 s	20.8 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	8.1 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	8.1 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	8.0 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	7.6 KiB
/system/modules/cz.osw.opencms.types/elements/cookies/coo...	86400.0 s	18.8 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	7.3 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	7.3 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	7.0 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	6.9 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	6.8 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	6.7 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	6.4 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	6.3 KiB
www.avcr.cz/system/modules/cz.nelasoft.opencms.avcr/resources/js/modernizr.js	86400.0 s	15.2 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	6.0 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	0.0 ms	5.6 KiB
/export/system/modules/cz.osw.opencms.types/resources/sli...	0.0 ms	5.0 KiB
/export/system/modules/cz.nelasoft.opencms.avcr/resources...	0.0 ms	3.0 KiB
/export/system/modules/cz.osw.opencms.types/resources/sli...	0.0 ms	2.8 KiB
/system/modules/cz.nelasoft.opencms.avcr/resources/js/jqu...	86400.0 s	6.4 KiB
/export/system/modules/cz.osw.opencms.types/resources/sli...	0.0 ms	2.2 KiB
www.avcr.cz/system/modules/cz.nelasoft.opencms.avcr/resources/js/dropdown.js	86400.0 s	5.0 KiB
/export/system/modules/cz.nelasoft.opencms.avcr/resources...	0.0 ms	1.9 KiB
/export/system/modules/cz.nelasoft.opencms.avcr/resources...	0.0 ms	1.7 KiB
/export/system/modules/cz.nelasoft.opencms.avcr/resources...	0.0 ms	823 B
/export/system/modules/cz.nelasoft.opencms.avcr/resources...	0.0 ms	392 B
/system/modules/cz.nelasoft.opencms.avcr/resources/img/th...	86400.0 s	951 B
/system/modules/cz.nelasoft.opencms.avcr/resources/img/th...	86400.0 s	920 B

Your first network request is the most important. Reduce its latency by avoiding redirects, ensuring a fast server response, and enabling text compression.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Consider setting font-display to swap or optional to ensure text is consistently visible. swap can be further optimized to mitigate layout shifts with font metric overrides.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Est Savings
/font-awesome/4.6.3/fonts/fontawesome-webfont.woff2?v=4.6.3	25 ms

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:source label:Top function call valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]

items: [map[reflowTime:46.097 source:map[column:4688 line:3 type:source-location url:https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js urlProvider:network]]]

headings: [map[key:source label:Source valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]

items: [map[reflowTime:19.675 source:map[column:24594 line:2 type:source-location url:https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js urlProvider:network]] map[reflowTime:105.036 source:map[column:30738 line:2 type:source-location url:https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js urlProvider:network]] map[reflowTime:0.441 source:map[column:27566 line:2 type:source-location url:https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js urlProvider:network]] map[reflowTime:0.076 source:map[column:27658 line:2 type:source-location url:https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js urlProvider:network]] map[reflowTime:6.027 source:map[column:24616 line:2 type:source-location url:https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js urlProvider:network]] map[reflowTime:0.134 source:map[column:387 line:0 type:source-location url:https://osw-analytics3.avcr.cz/js/plausible.manual.file-downloads.js urlProvider:network]]]

Reducing the download time of images can improve the perceived load time of the page and LCP. Learn more about optimizing image size

Why this matters

Performance issues directly impact user engagement and conversion rates.

	URL	Resource Size	Est Savings
div.slide-item > a > div.img-wrapper > img.img-fluid `div.slide-item > a > div.img-wrapper > img.img-fluid`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	158.9 KiB	91.7 KiB
Na hradě Štamberk se zřejmě bydlelo pouhých 150 let. `div.content > div.thumbs > div.bigThumb > img`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	73.7 KiB	60.5 KiB
Hlavní dominantu Vyšehradu dnes tvoří kapitulní chrám sv. apoštolů Petra a Pavl… `div.content > div.thumbs > div.bigThumb > img`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	53.5 KiB	40.3 KiB
Na okraji Kroměříže se nacházejí dva Medkovy rybníky. Invazní sumeček černý se … `div.content > div.thumbs > div.bigThumb > img`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	50.8 KiB	37.6 KiB
div.video-entry-inner > div.image > a > img.img-responsive `div.video-entry-inner > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	47.2 KiB	34.2 KiB
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	42.1 KiB	33.6 KiB
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	35.8 KiB	30.6 KiB
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/.content/galerie-obrazku/aktuality/2026/2026_04_21_Radim...	37.6 KiB	29.2 KiB
Akademie věd České republiky `div.footer > div.logo > a > img`	/export/system/modules/cz.nelasoft.opencms.avcr/resources...	29.5 KiB	28.2 KiB
Centrum translačního výzkumu PharmTheon se nachází na pražské Harfě. Disponuje … `div.content > div.thumbs > div.bigThumb > img`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	40.7 KiB	27.5 KiB
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	35.7 KiB	27.2 KiB
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	35.1 KiB	26.7 KiB
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	28.4 KiB	24.1 KiB
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	29.9 KiB	21.5 KiB
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	25.3 KiB	21.4 KiB
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	25.2 KiB	21.4 KiB
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	24.4 KiB	20.7 KiB
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	28.3 KiB	20.3 KiB
Letiště Roudnice nad Labem. Odsud startovaly lety pro veřejnost v rámci Archeol… `div.content > div.thumbs > div.bigThumb > img`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	33.2 KiB	20.0 KiB
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	23.5 KiB	19.9 KiB
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	22.6 KiB	19.1 KiB
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	26.1 KiB	18.8 KiB
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	20.7 KiB	17.6 KiB
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	20.5 KiB	17.4 KiB
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	20.5 KiB	17.4 KiB
div.video-entry-inner > div.image > a > img.img-responsive `div.video-entry-inner > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	29.8 KiB	16.8 KiB
div.video-entry-inner > div.image > a > img.img-responsive `div.video-entry-inner > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	28.8 KiB	16.2 KiB
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	20.0 KiB	14.4 KiB
div.video-entry-inner > div.image > a > img.img-responsive `div.video-entry-inner > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	23.8 KiB	13.4 KiB
div.video-entry-inner > div.image > a > img.img-responsive `div.video-entry-inner > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	19.1 KiB	10.7 KiB
Sumeček černý pochází původně ze Severní Ameriky, do Evropy se dostal v 19. sto… `div.content > div.thumbs > div.thumb > img`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	8.1 KiB	6.7 KiB
Z hradu se zachoval kus vysoké jižní zdi, částečně odhalené stěny dvouprostorov… `div.content > div.thumbs > div.thumb > img`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	7.8 KiB	6.5 KiB
V roce 2003 povýšil papež Jan Pavel II. vyšehradský kapitulní chrám na papežsko… `div.content > div.thumbs > div.thumb > img`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	7.8 KiB	6.5 KiB
Zřícenina se nachází u Telče, která je nejen kulturní památkou zapsanou na Sezn… `div.content > div.thumbs > div.thumb > img`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	7.7 KiB	6.4 KiB
Čas jeho slávy se dá ohraničit poslední čtvrtinou 13. století a husitskými válk… `div.content > div.thumbs > div.thumb > img`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	7.3 KiB	6.0 KiB
Kromě letadla s pilotem potřebuje „nebeský“ archeolog i další vybavení. Dříve, … `div.content > div.thumbs > div.thumb > img`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	7.0 KiB	5.7 KiB
Pro vodní ekosystémy představuje tato rybka velkou hrozbu. Je všežravá, nemá mn… `div.content > div.thumbs > div.thumb > img`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	7.0 KiB	5.6 KiB
„Chovatelé mají s tímto druhem velký problém. Finanční ztráty se dají vyčíslit … `div.content > div.thumbs > div.thumb > img`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	6.7 KiB	5.4 KiB
V současné době výzkumníci rozvíjejí několik projektů, které se zaměřují předev… `div.content > div.thumbs > div.thumb > img`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	6.6 KiB	5.2 KiB
V kapli sv. Klimenta uvnitř chrámu se nachází románský sarkofág (v pravém dolní… `div.content > div.thumbs > div.thumb > img`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	6.5 KiB	5.2 KiB
Pod presbytářem kapitulního chrámu je dobře zachovaná románská apsida (půlkruho… `div.content > div.thumbs > div.thumb > img`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	6.4 KiB	5.1 KiB
Návštěvníci měli možnost zúčastnit se letu s nestorem české letecké archeologie… `div.content > div.thumbs > div.thumb > img`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	6.1 KiB	4.8 KiB
Při přenosu léků z laboratoře do klinické praxe je klíčová rychlost a preciznos… `div.content > div.thumbs > div.thumb > img`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	6.0 KiB	4.7 KiB
Pomocí NMR spektroskopie vědci v PharmTheonu zkoumají, jak přesně vypadají a fu… `div.content > div.thumbs > div.thumb > img`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	5.7 KiB	4.4 KiB

Each subpart has specific improvement strategies. Ideally, most of the LCP time should be spent on loading the resources, not within delays.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:label label:Subpart valueType:text] map[key:duration label:Duration valueType:ms]]

items: [map[duration:2374.843 label:Time to first byte subpart:timeToFirstByte] map[duration:154.982 label:Resource load delay subpart:resourceLoadDelay] map[duration:1400.465 label:Resource load duration subpart:resourceLoadDuration] map[duration:53.211 label:Element render delay subpart:elementRenderDelay]]

lhId: page-0-IMG

nodeLabel: div.slide-item > a > div.img-wrapper > img.img-fluid

path: 1,HTML,1,BODY,1,DIV,0,DIV,1,DIV,0,DIV,0,DIV,0,DIV,0,DIV,1,DIV,0,DIV,1,DIV,0,A,0,DIV,0,IMG

selector: div.slide-item > a > div.img-wrapper > img.img-fluid

snippet: <img src="/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/2026/2026_04_21_L…" alt="" class="img-fluid">

Optimize LCP by making the LCP image discoverable from the HTML immediately, and avoiding lazy-loading

Why this matters

Performance issues directly impact user engagement and conversion rates.

lhId: page-0-IMG

nodeLabel: div.slide-item > a > div.img-wrapper > img.img-fluid

path: 1,HTML,1,BODY,1,DIV,0,DIV,1,DIV,0,DIV,0,DIV,0,DIV,0,DIV,1,DIV,0,DIV,1,DIV,0,A,0,DIV,0,IMG

selector: div.slide-item > a > div.img-wrapper > img.img-fluid

snippet: <img src="/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/2026/2026_04_21_L…" alt="" class="img-fluid">

Avoid chaining critical requests by reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load.

Why this matters

Performance issues directly impact user engagement and conversion rates.

title: Preconnected origins

value: no origins were preconnected

description: Add [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints to your most important origins, but try to use no more than 4.

title: Preconnect candidates

Requests are blocking the page's initial render, which may delay LCP. Deferring or inlining can move these network requests out of the critical path.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Transfer Size	Duration
/system/modules/cz.osw.opencms.types/resources/slick-phot...	52.3 KiB	392 ms
/system/modules/cz.nelasoft.opencms.avcr/resources/js/jqu...	74.3 KiB	585 ms
/system/modules/cz.nelasoft.opencms.avcr/resources/js/jqu...	6.4 KiB	199 ms
www.avcr.cz/system/modules/cz.nelasoft.opencms.avcr/resources/js/dropdown.js	5.0 KiB	199 ms
/system/modules/cz.nelasoft.opencms.avcr/resources/js/owl...	23.7 KiB	392 ms
/export/system/modules/cz.nelasoft.opencms.media/resource...	79.7 KiB	585 ms
www.avcr.cz/system/modules/cz.nelasoft.opencms.avcr/resources/js/modernizr.js	15.2 KiB	199 ms
/export/system/modules/cz.nelasoft.opencms.media/resource...	24.4 KiB	392 ms
/export/system/modules/cz.nelasoft.opencms.avcr/resources...	15.8 KiB	778 ms
/export/system/modules/cz.osw.opencms.types/resources/sli...	5.0 KiB	199 ms
/export/system/modules/cz.nelasoft.opencms.avcr/resources...	33.5 KiB	778 ms
/export/system/modules/cz.nelasoft.opencms.avcr/resources...	392 B	199 ms
/export/system/modules/cz.nelasoft.opencms.avcr/resources...	3.0 KiB	585 ms
/export/system/modules/cz.nelasoft.opencms.avcr/resources...	1.9 KiB	585 ms
/export/system/modules/cz.nelasoft.opencms.avcr/resources...	1.7 KiB	585 ms
/export/system/modules/cz.nelasoft.opencms.avcr/resources...	71.4 KiB	585 ms
/export/system/modules/cz.osw.opencms.types/resources/sli...	2.2 KiB	199 ms
ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js	33.4 KiB	407 ms
netdna.bootstrapcdn.com/font-awesome/4.6.3/css/font-awesome.css	7.4 KiB	266 ms

HTTP/2 and HTTP/3 offer many benefits over HTTP/1.1, such as multiplexing. Learn more about using modern HTTP.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Protocol
www.avcr.cz/cs/	http/1.1
/export/system/modules/cz.nelasoft.opencms.avcr/resources...	http/1.1
/export/system/modules/cz.nelasoft.opencms.avcr/resources...	http/1.1
/export/system/modules/cz.nelasoft.opencms.avcr/resources...	http/1.1
/export/system/modules/cz.nelasoft.opencms.avcr/resources...	http/1.1
/export/system/modules/cz.nelasoft.opencms.avcr/resources...	http/1.1
/export/system/modules/cz.nelasoft.opencms.avcr/resources...	http/1.1
/export/system/modules/cz.nelasoft.opencms.avcr/resources...	http/1.1
/export/system/modules/cz.osw.opencms.types/resources/sli...	http/1.1
/export/system/modules/cz.nelasoft.opencms.media/resource...	http/1.1
/system/modules/cz.nelasoft.opencms.avcr/resources/js/jqu...	http/1.1
/export/system/modules/cz.nelasoft.opencms.media/resource...	http/1.1
www.avcr.cz/system/modules/cz.nelasoft.opencms.avcr/resources/js/modernizr.js	http/1.1
/system/modules/cz.nelasoft.opencms.avcr/resources/js/owl...	http/1.1
www.avcr.cz/system/modules/cz.nelasoft.opencms.avcr/resources/js/dropdown.js	http/1.1
/system/modules/cz.nelasoft.opencms.avcr/resources/js/jqu...	http/1.1
/system/modules/cz.osw.opencms.types/resources/slick-phot...	http/1.1
/export/system/modules/cz.nelasoft.opencms.avcr/resources...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/.content/galerie-obrazku/aktuality/2026/2026_04_21_Radim...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...	http/1.1
/system/modules/cz.osw.opencms.types/elements/cookies/coo...	http/1.1
/system/modules/cz.nelasoft.opencms.avcr/resources/js/coo...	http/1.1
/export/system/modules/cz.osw.opencms.types/resources/sli...	http/1.1
/export/system/modules/cz.nelasoft.opencms.avcr/resources...	http/1.1
/system/modules/cz.nelasoft.opencms.avcr/resources/img/th...	http/1.1
/system/modules/cz.nelasoft.opencms.avcr/resources/img/th...	http/1.1
/export/system/modules/cz.osw.opencms.types/resources/sli...	http/1.1
/export/system/modules/cz.osw.opencms.types/elements/cook...	http/1.1
www.avcr.cz/favicon.ico	http/1.1

These insights are also available in the Chrome DevTools Performance Panel - record a trace to view more detailed information.

Redirects introduce additional delays before the page can be loaded. Learn how to avoid page redirects.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 1.3 s

URL	Time Spent
cas.cz/	680 ms
www.avcr.cz/	665 ms
www.avcr.cz/cs/	0.0 ms

Time to Interactive is the amount of time it takes for the page to become fully interactive. Learn more about the Time to Interactive metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

TTI

Diagnostics

Minifying CSS files can reduce network payload sizes. Learn how to minify CSS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 190 ms 33.5 KiB

URL	Transfer Size	Est Savings
/export/system/modules/cz.nelasoft.opencms.avcr/resources...	71.4 KiB	21.5 KiB
/export/system/modules/cz.nelasoft.opencms.avcr/resources...	33.5 KiB	5.1 KiB
/export/system/modules/cz.nelasoft.opencms.media/resource...	24.4 KiB	4.4 KiB
/export/system/modules/cz.nelasoft.opencms.avcr/resources...	15.8 KiB	2.6 KiB

Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. Learn how to reduce unused CSS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 190 ms 118.6 KiB

URL	Transfer Size	Est Savings
/export/system/modules/cz.nelasoft.opencms.avcr/resources...	71.1 KiB	59.9 KiB
/export/system/modules/cz.nelasoft.opencms.media/resource...	24.1 KiB	24.1 KiB
/export/system/modules/cz.nelasoft.opencms.avcr/resources...	33.2 KiB	19.1 KiB
/export/system/modules/cz.nelasoft.opencms.avcr/resources...	15.5 KiB	15.5 KiB

Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. Learn how to reduce unused JavaScript.

Why this matters

Multi-megabyte JavaScript bundles delay every interactive feature on the page.

Learn more ▾

Source: Google web.dev / Lighthouse

Estimated savings: 190 ms 257.9 KiB

URL	Transfer Size	Est Savings
www.googletagmanager.com/gtag/js?id=G-ETQEE59TKV	156.8 KiB	85.7 KiB
/export/system/modules/cz.nelasoft.opencms.media/resource...	79.3 KiB	65.3 KiB
/system/modules/cz.nelasoft.opencms.avcr/resources/js/jqu...	74.0 KiB	65.1 KiB
/system/modules/cz.nelasoft.opencms.avcr/resources/js/owl...	23.3 KiB	21.6 KiB
/system/modules/cz.osw.opencms.types/resources/slick-phot...	51.9 KiB	20.2 KiB

Minifying JavaScript files can reduce payload sizes and script parse time. Learn how to minify JavaScript.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 0.0 ms 11.1 KiB

URL	Transfer Size	Est Savings
/system/modules/cz.nelasoft.opencms.avcr/resources/js/coo...	20.5 KiB	11.1 KiB

Set an explicit width and height on image elements to reduce layout shifts and improve CLS. Learn how to set image dimensions

Why this matters

Performance issues directly impact user engagement and conversion rates.

	URL
div.slide-item > a > div.img-wrapper > img.img-fluid `div.slide-item > a > div.img-wrapper > img.img-fluid`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/.content/galerie-obrazku/aktuality/2026/2026_04_21_Radim...
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive `div.col-xs-12 > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.video-entry-inner > div.image > a > img.img-responsive `div.video-entry-inner > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.video-entry-inner > div.image > a > img.img-responsive `div.video-entry-inner > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.video-entry-inner > div.image > a > img.img-responsive `div.video-entry-inner > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.video-entry-inner > div.image > a > img.img-responsive `div.video-entry-inner > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.video-entry-inner > div.image > a > img.img-responsive `div.video-entry-inner > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.video-entry-inner > div.image > a > img.img-responsive `div.video-entry-inner > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.video-entry-inner > div.image > a > img.img-responsive `div.video-entry-inner > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.video-entry-inner > div.image > a > img.img-responsive `div.video-entry-inner > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.video-entry-inner > div.image > a > img.img-responsive `div.video-entry-inner > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.video-entry-inner > div.image > a > img.img-responsive `div.video-entry-inner > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.video-entry-inner > div.image > a > img.img-responsive `div.video-entry-inner > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.video-entry-inner > div.image > a > img.img-responsive `div.video-entry-inner > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.video-entry-inner > div.image > a > img.img-responsive `div.video-entry-inner > div.image > a > img.img-responsive`	/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...

More information about the performance of your application. These numbers don't directly affect the Performance score.

●Layout shift culprits

●Optimize DOM size

●Optimize viewport for mobile

●Max Potential First Input Delay 40 ms

●Avoids enormous network payloads Total size was 2,264 KiB

●JavaScript execution time 0.2 s

●Minimizes main-thread work 0.8 s

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 160 ms

●Server Backend Latencies 30 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Initial server response time was short Root document took 420 ms

●Avoid large layout shifts 2 layout shifts found

○INP breakdown

○User Timing marks and measures

○Avoid long main-thread tasks

○Avoid non-composited animations

Accessibility

Names and labels

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div#list-iems-2029cc38-683b-11e9-ade2-005056bf6eb8 > div.col-xs-12 > div.image > a `div#list-iems-2029cc38-683b-11e9-ade2-005056bf6eb8 > div.col-xs-12 > div.image > a`
div#list-iems-2029cc38-683b-11e9-ade2-005056bf6eb8 > div.col-xs-12 > div.image > a `div#list-iems-2029cc38-683b-11e9-ade2-005056bf6eb8 > div.col-xs-12 > div.image > a`
div#list-iems-2029cc38-683b-11e9-ade2-005056bf6eb8 > div.col-xs-12 > div.image > a `div#list-iems-2029cc38-683b-11e9-ade2-005056bf6eb8 > div.col-xs-12 > div.image > a`
div#list-iems-2029cc38-683b-11e9-ade2-005056bf6eb8 > div.col-xs-12 > div.image > a `div#list-iems-2029cc38-683b-11e9-ade2-005056bf6eb8 > div.col-xs-12 > div.image > a`
div#list-iems-7dce9a82-51c2-11ec-bca5-005056bf6eb8 > div.col-xs-12 > div.image > a `div#list-iems-7dce9a82-51c2-11ec-bca5-005056bf6eb8 > div.col-xs-12 > div.image > a`
div#list-iems-7dce9a82-51c2-11ec-bca5-005056bf6eb8 > div.col-xs-12 > div.image > a `div#list-iems-7dce9a82-51c2-11ec-bca5-005056bf6eb8 > div.col-xs-12 > div.image > a`
div#list-iems-7dce9a82-51c2-11ec-bca5-005056bf6eb8 > div.col-xs-12 > div.image > a `div#list-iems-7dce9a82-51c2-11ec-bca5-005056bf6eb8 > div.col-xs-12 > div.image > a`
div#list-iems-7dce9a82-51c2-11ec-bca5-005056bf6eb8 > div.col-xs-12 > div.image > a `div#list-iems-7dce9a82-51c2-11ec-bca5-005056bf6eb8 > div.col-xs-12 > div.image > a`
div.video-entry > div.video-entry-inner > div.image > a `div.video-entry > div.video-entry-inner > div.image > a`
div.video-entry > div.video-entry-inner > div.image > a.play-button-videorep `div.video-entry > div.video-entry-inner > div.image > a.play-button-videorep`
div.video-entry > div.video-entry-inner > div.image > a `div.video-entry > div.video-entry-inner > div.image > a`
div.video-entry > div.video-entry-inner > div.image > a.play-button-videorep `div.video-entry > div.video-entry-inner > div.image > a.play-button-videorep`
div.video-entry > div.video-entry-inner > div.image > a `div.video-entry > div.video-entry-inner > div.image > a`
div.video-entry > div.video-entry-inner > div.image > a.play-button-videorep `div.video-entry > div.video-entry-inner > div.image > a.play-button-videorep`
div > div.col-xs-12 > div.image > a `div > div.col-xs-12 > div.image > a`
div.content > div.title > h3 > a `div.content > div.title > h3 > a`
div > div.col-xs-12 > div.image > a `div > div.col-xs-12 > div.image > a`
div.content > div.title > h3 > a `div.content > div.title > h3 > a`
div > div.col-xs-12 > div.image > a `div > div.col-xs-12 > div.image > a`
div.content > div.title > h3 > a `div.content > div.title > h3 > a`
div > div.col-xs-12 > div.image > a `div > div.col-xs-12 > div.image > a`
div.content > div.title > h3 > a `div.content > div.title > h3 > a`
div > div.col-xs-12 > div.image > a `div > div.col-xs-12 > div.image > a`
div.content > div.title > h3 > a `div.content > div.title > h3 > a`

These are opportunities to improve the semantics of the controls in your application. This may enhance the experience for users of assistive technology, like a screen reader.

Best practices

Touch targets with sufficient size and spacing help users who may have difficulty targeting small controls to activate the targets. Learn more about touch targets.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
zpracování osobních údajů `form#nwl_form > div.sk_col2 > div > a`
Poslání `div.footer-nav-col > ul > li > a`
Struktura `div.footer-nav-col > ul > li > a`
Ocenění `div.footer-nav-col > ul > li > a`
Historie `div.footer-nav-col > ul > li > a`
Výroční zpráva `div.footer-nav-col > ul > li > a`
Hodnocení `div.footer-nav-col > ul > li > a`
Kariéra `div.footer-nav-col > ul > li > a`
Kontakt `div.footer-nav-col > ul > li > a`
Podpora výzkumu `div.footer-nav-col > ul > li > a`
Vědecký titul DSc. `div.footer-nav-col > ul > li > a`
Pomoc Ukrajině `div.footer-nav-col > ul > li > a`
Spolupráce `div.footer-nav-col > ul > li > a`
Transfer technologií `div.footer-nav-col > ul > li > a`
Mezinárodní vztahy `div.footer-nav-col > ul > li > a`
Vědecké společnosti `div.footer-nav-col > ul > li > a`
Znalecká činnost `div.footer-nav-col > ul > li > a`
Výstavy `div.footer-nav-col > ul > li > a`
Časopisy `div.footer-nav-col > ul > li > a`
Podcasty `div.footer-nav-col > ul > li > a`
Videotvorba `div.footer-nav-col > ul > li > a`
NEZkreslená věda `div.footer-nav-col > ul > li > a`
Kurzy pro pedagogy `div.footer-nav-col > ul > li > a`
Stáže pro studenty `div.footer-nav-col > ul > li > a`
Občanská věda `div.footer-nav-col > ul > li > a`
Publikace ke stažení `div.footer-nav-col > ul > li > a`
Kontakty pro média `div.footer-nav-col > ul > li > a`
Časopis Živa `div.footer-nav-col > ul > li > a`
Knihovna AV ČR `div.footer-nav-col > ul > li > a`
Nakladatelství Academia `div.footer-nav-col > ul > li > a`
Týden Akademie věd ČR `div.footer-nav-col > ul > li > a`

These items highlight common accessibility best practices.

○Interactive controls are keyboard focusable

○Interactive elements indicate their purpose and state

○The page has a logical tab order

○Visual order on the page follows DOM order

○User focus is not accidentally trapped in a region

○The user's focus is directed to new content added to the page

○HTML5 landmark elements are used to improve navigation

○Offscreen content is hidden from assistive technology

○Custom controls have associated labels

○Custom controls have ARIA roles

●`[aria-*]` attributes match their roles

●`[aria-hidden="true"]` is not present on the document `<body>`

●`[role]`s have all required `[aria-*]` attributes

●`[role]` values are valid

●`[aria-*]` attributes have valid values

●`[aria-*]` attributes are valid and not misspelled

●Buttons have an accessible name

●Image elements have `[alt]` attributes

●Form elements have associated labels

●`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.

●ARIA attributes are used as specified for the element's role

●Elements with `role="dialog"` or `role="alertdialog"` have accessible names.

●`[aria-hidden="true"]` elements do not contain focusable descendents

●Elements use only permitted ARIA attributes

●Background and foreground colors have a sufficient contrast ratio

●Document has a `<title>` element

●`<html>` element has a `[lang]` attribute

●`<html>` element has a valid value for its `[lang]` attribute

●Links are distinguishable without relying on color.

●Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).

●List items (`<li>`) are contained within `<ul>`, `<ol>` or `<menu>` parent elements

●No element has a `[tabindex]` value greater than 0

●Heading elements appear in a sequentially-descending order

●Document has a main landmark.

●Deprecated ARIA roles were not used

●All heading elements contain content.

●Identical links have the same purpose.

○`[accesskey]` values are unique

○`button`, `link`, and `menuitem` elements have accessible names

○ARIA input fields have accessible names

○ARIA `meter` elements have accessible names

○ARIA `progressbar` elements have accessible names

○Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.

○`[role]`s are contained by their required parent element

○Elements with the `role=text` attribute do not have focusable descendents.

○ARIA toggle fields have accessible names

○ARIA `tooltip` elements have accessible names

○ARIA `treeitem` elements have accessible names

○The page contains a heading, skip link, or landmark region

○`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.

○Definition list items are wrapped in `<dl>` elements

○ARIA IDs are unique

○No form fields have multiple labels

○`<frame>` or `<iframe>` elements have a title

○`<html>` element has an `[xml:lang]` attribute with the same base language as the `[lang]` attribute.

○Input buttons have discernible text.

○`<input type="image">` elements have `[alt]` text

○The document does not use `<meta http-equiv="refresh">`

○`<object>` elements have alternate text

○Select elements have associated label elements.

○Skip links are focusable.

○Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.

○`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.

○`[lang]` attributes have a valid value

○`<video>` elements contain a `<track>` element with `[kind="captions"]`

○Tables have different content in the summary attribute and `<caption>`.

○Uses ARIA roles only on compatible elements

○Image elements do not have `[alt]` attributes that are redundant text.

○Elements with visible text labels have matching accessible names.

○Tables use `<caption>` instead of cells with the `[colspan]` attribute to indicate a caption.

○`<td>` elements in a large `<table>` have one or more table headers.

100

Best Practices

●Uses HTTPS

●Avoids deprecated APIs

●Avoids third-party cookies

●Allows users to paste into input fields

●Avoids requesting the geolocation permission on page load

●Avoids requesting the notification permission on page load

●Displays images with correct aspect ratio

●Serves images with appropriate resolution

●Page has the HTML doctype

●Properly defines charset

●No browser errors logged to the console

●No issues in the `Issues` panel in Chrome Devtools

●Ensure CSP is effective against XSS attacks

●Use a strong HSTS policy

●Ensure proper origin isolation with COOP

●Mitigate clickjacking with XFO or CSP

●Mitigate DOM-based XSS with Trusted Types

●Detected JavaScript libraries

●Page has valid source maps

○Redirects HTTP traffic to HTTPS

100

SEO

○Structured data is valid

●Page isn’t blocked from indexing

●Document has a `<title>` element

●Document has a meta description

●Page has successful HTTP status code

●Links have descriptive text

●Links are crawlable

●robots.txt is valid

●Image elements have `[alt]` attributes

●Document has a valid `hreflang`

○Document has a valid `rel=canonical`

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