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Performance

· 23 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
80
GRADE
B
FIX
4
REVIEW
7
PASS
8
INFO
4

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

Mobile Desktop
90
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
74
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
77
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
83
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

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

970 ms

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

1.68 s

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

4 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.

1.55 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.

2.71 s

Page Load Progression

394 ms
787 ms
1.2 s
1.6 s
2.0 s
2.4 s
2.8 s
3.1 s
Checks
23
8 PASS 7 REVIEW 4 FIX
D
Page Weight Budget
Action
2.1 MB transferred, 47 requests
FIX
2.1 MB transferred, 47 requests
Info::
Page weighs 4.3 MB (2.1 MB transferred)
Warning::
JavaScript is 1.3 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.3 MB
Info::
47 HTTP requests
Info::
Estimated 0.45 g CO2 per page load
2.1 MB / 2.4 MB budget
2.1 MB transferred
47 requests
0.45 g CO2 per page load
JavaScript 1.3 MiB 60%
Images 655.8 KiB 30%
Fonts 101.4 KiB 5%
CSS 58.7 KiB 3%
HTML 39.3 KiB 2%
Other 14.8 KiB 1%
Other 1.3 KiB 0%
Other 618 B 0%
0 2.4 MB 4.9 MB
Approaching limit

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

F
JS Bundles
Action
23 scripts, 648 KB unused
FIX
23 scripts, 648 KB unused
Warning::
https://www.sazimebudoucnost.cz/App_Themes/common/...: 141 KB unused (90%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=AW-788...: 87 KB unused (61%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-N0TR...: 74 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/destination?...: 72 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-5VR...: 69 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 648 KB
648 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.sazimebudoucnost.cz/App_Themes/common/js/angular.min.js156 KB141 KB (90%)✓1st
https://www.googletagmanager.com/gtag/js?id=AW-788450732&cx=c&gtm=4e68q1143 KB87 KB (61%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-N0TREDT34H&cx=c&gtm=4e68q1181 KB74 KB (41%)✓3rd
https://www.googletagmanager.com/gtag/destination?id=AW-788450732&cx=c&gtm=4e68q1146 KB72 KB (49%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5VR2TV4167 KB69 KB (42%)✓3rd
https://www.googletagmanager.com/gtag/js?id=GT-MBLW7787&cx=c&gtm=4e68q1155 KB68 KB (44%)✓3rd
https://www.sazimebudoucnost.cz/App_Themes/Common/js/jquery-1.12.0.min.js95 KB43 KB (45%)✓1st
https://www.sazimebudoucnost.cz/App_Themes/Bootstrap-4.3.1/js/bootstrap.min.js57 KB43 KB (75%)✓1st
https://c.seznam.cz/js/rc.js51 KB30 KB (60%)✓3rd
https://www.sazimebudoucnost.cz/WebResource.axd?d=pynGkmcFUV13He1Qd6_TZFA2g95lCOqoH6nSqbFTyLNf_7T9cbDkmHJKkgnp3zpS3JgvKJO8IuMIl0zH6Sk_7g2&t=63890160824815733223 KB20 KB (91%)✗1st

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

F
Page Weight Inventory
Action
47 resources · 2.1 MB · 648 KB savings available
FIX
47 resources · 2.1 MB · 648 KB savings available
Warning::
Page weight 2.1 MB exceeds 1 MB target by 1.1 MB
Got: 2.1 MB Expected: ≤ 1 MB
Info::
~648 KB of savings available
Warning::
14 third-party resources (43% of weight)
Info::
2 resources over 200KB
47 resources · 2.1 MiB · 14 third-party 1.1 MiB over 1MB target
JavaScript 60% · 1.3 MiB
Image 31% · 670.6 KiB
Font 5% · 101.4 KiB
CSS 3% · 58.7 KiB
Document 2% · 39.3 KiB
Other 0% · 1.9 KiB

~648.3 KiB of savings available

Remove unused JavaScript: 648.3 KiB
D
HTTP Caching
Action
no-store (uncacheable)
FIX
no-store (uncacheable)
Info::
Cache-Control: no-store prevents all caching
Intentional for dynamic content, but increases server load for every page view.
Got: no-cache, no-store, must-revalidate
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

no-cache, no-store, must-revalidate

DirectiveValueMeaning
no-cache—Cache but always revalidate first
no-store—Never cache this response
must-revalidate—Must recheck with server after expiry
B
Third-Party Impact
43% third-party, 0 ms blocking
REVIEW
43% third-party, 0 ms blocking
Info::
Third-party code accounts for 43% of page weight (946.2 KiB of 2.1 MiB)
Info::
Third-party blocking time is low (0 ms)
57%
43%
First-party Third-party
B
Image Optimization
10 images, 0 KB saveable
REVIEW
10 images, 0 KB saveable
Warning::
is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
10 images 656 KB
0 oversized -0 KB
9 legacy format
1 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

B
JS Execution Cost
545ms total JS execution
REVIEW
545ms total JS execution
Warning::
https://www.sazimebudoucnost.cz/: 276ms CPU time
Info::
https://www.sazimebudoucnost.cz/App_Themes/Common/...: 78ms CPU time
Info::
Unattributable: 66ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-5VR...: 65ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-N0TR...: 60ms CPU time
Info::
Third-party scripts: 125ms (23% of total)

Main Thread Breakdown

Script Evaluation 37% Other 23% Style & Layout 19% Rendering 9% Script Parsing & Compilation 8%
ScriptTotalScriptingParse/CompileParty
https://www.sazimebudoucnost.cz/276ms4ms2ms1st
https://www.sazimebudoucnost.cz/App_Themes/Common/js/jquery-1.12.0.min.js78ms35ms2ms1st
Unattributable66ms2ms0ms1st
https://www.googletagmanager.com/gtm.js?id=GTM-5VR2TV465ms53ms11ms3rd
https://www.googletagmanager.com/gtag/js?id=G-N0TREDT34H&cx=c&gtm=4e68q160ms51ms9ms3rd
B
HTTP/3 (QUIC)
HTTP/3 not advertised
REVIEW
HTTP/3 not advertised
Info::
HTTP/3 (QUIC) is not advertised
HTTP/3 isn't advertised via Alt-Svc and the worker didn't negotiate h3. HTTP/3 reduces handshake latency (1-RTT instead of 2-3 RTTs) and is more resilient on lossy connections. Most modern CDNs (Cloudflare, Fastly, AWS CloudFront, Google Cloud CDN) support HTTP/3 with a single config switch -- consider enabling for mobile-heavy workloads.
C
Compression Algorithm
Action
Main response uses legacy deflate; upgrade to brotli or gzip
REVIEW
Main response uses legacy deflate; upgrade to brotli or gzip
Info::
Main HTML response uses deflate (legacy; prefer brotli or gzip)
Raw deflate is rarely used today and not handled identically across browsers. Switch to brotli (best) or gzip (universal).
B
Server-Timing Observability
No Server-Timing header found
REVIEW
No Server-Timing header found
Info::
No Server-Timing header found
Server-Timing exposes backend timing breakdowns to browser DevTools (e.g., `db: 45ms; render: 120ms; cache: 2ms`). Useful for diagnosing slow pages without backend log access. Most modern frameworks (Next.js, Cloudflare Workers, Fastly) emit it automatically; absence on a managed platform usually means telemetry headers are stripped at the edge.
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+
Font Loading
2 fonts (101 KB)
PASS
2 fonts (101 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

101 KB total

Render-blocking

0

of 2

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s 1.5 s FCP 970 ms LCP 1.7 shttps://fonts.gstatic.com/s/montserrat/v31/JTUSjIg1_i6t8kCHKm459WlhyyTh89Y.woff2JTUSjIg1_i6t8kCHKm459Wl... https://fonts.gstatic.com/s/montserrat/v31/JTUSjIg1_i6t8kCHKm459WlhyyTh89Y.woff2 — 34.7 KiB — 28 ms — font-display: swaphttps://fonts.gstatic.com/s/montserrat/v31/JTUSjIg1_i6t8kCHKm459WdhyyTh89ZNpQ.woff2JTUSjIg1_i6t8kCHKm459Wd... https://fonts.gstatic.com/s/montserrat/v31/JTUSjIg1_i6t8kCHKm459WdhyyTh89ZNpQ.woff2 — 66.7 KiB — 37 ms — font-display: swap
JTUSjIg1_i6t8kCHKm459Wl... woff2 swap
Size 35 KB
Load time 28 ms
Start 293 ms
Risk FOUT — text flashes from fallback to web font
JTUSjIg1_i6t8kCHKm459Wd... woff2 swap
Size 67 KB
Load time 37 ms
Start 325 ms
Risk FOUT — text flashes from fallback to web font
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)
A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
A+
LCP Image Preload
LCP preload audit not available
PASS
LCP preload audit not available
Info::
LCP image preload audit not available for this scan
A+
Main HTML Cache-Control
Main HTML uses no-store -- correct for sensitive/dynamic content
PASS
Main HTML uses no-store -- correct for sensitive/dynamic content
Info::
Main HTML uses no-store -- correct for sensitive/dynamic content
Got: no-cache, no-store, must-revalidate
A+
Server Response Intelligence
2 server-response signal(s) detected
PASS
2 server-response signal(s) detected
Info::
`Vary` header declared: Accept-Encoding
The page declares a `Vary` header, telling downstream caches which request headers the response varies on. Critical for content-negotiated responses (compression, language, cookies, device class).
Info::
No `ETag` or `Last-Modified` -- conditional GET not supported
Without either header, browsers can't issue conditional GETs and refresh always re-downloads the full response body even when nothing changed. Add `ETag: "<hash>"` (or `Last-Modified: <date>`) on cacheable responses; the server returns 304 Not Modified when the client's cached copy is still valid, saving bandwidth.
Network Waterfall
47 requests over 883ms
INFO
0 ms 500 ms 1.0 s 1.5 s FCP 970 ms LCP 1.7 shttps://www.sazimebudoucnost.cz// https://www.sazimebudoucnost.cz/ — 200 — 39.3 KiB — 150 ms — h2https://fonts.googleapis.com/css?family=Istok+Web:300,400,700italic,700,900,400italic%7CMontserrat:300,400,500,700,800,900&subset=latin,latin-extfonts.googleapis.com/css?family=Ist... https://fonts.googleapis.com/css?family=Istok+Web:300,400,700italic,700,900,400italic%7CMontserrat:300,400,500,700,800,900&subset=latin,latin-ext — 200 — 1.4 KiB — 80 ms — h2https://www.sazimebudoucnost.cz/CMSPages/GetResource.ashx?stylesheetfile=/App_Themes/Bootstrap-4.3.1/css/bootstrap.min.css/CMSPages/GetResource.ashx?styleshe... https://www.sazimebudoucnost.cz/CMSPages/GetResource.ashx?stylesheetfile=/App_Themes/Bootstrap-4.3.1/css/bootstrap.min.css — 200 — 22.9 KiB — 50 ms — h2https://www.sazimebudoucnost.cz/CMSPages/GetResource.ashx?stylesheetfile=/App_Themes/Global/skin.css/CMSPages/GetResource.ashx?styleshe... https://www.sazimebudoucnost.cz/CMSPages/GetResource.ashx?stylesheetfile=/App_Themes/Global/skin.css — 200 — 15.4 KiB — 74 ms — h2https://www.sazimebudoucnost.cz/CMSPages/GetResource.ashx?stylesheetfile=/App_Themes/Common/css/slick.min.css/CMSPages/GetResource.ashx?styleshe... https://www.sazimebudoucnost.cz/CMSPages/GetResource.ashx?stylesheetfile=/App_Themes/Common/css/slick.min.css — 200 — 612 B — 46 ms — h2https://www.sazimebudoucnost.cz/CMSPages/GetResource.ashx?stylesheetfile=/App_Themes/Common/css/slick-theme.min.css/CMSPages/GetResource.ashx?styleshe... https://www.sazimebudoucnost.cz/CMSPages/GetResource.ashx?stylesheetfile=/App_Themes/Common/css/slick-theme.min.css — 200 — 840 B — 47 ms — h2https://www.sazimebudoucnost.cz/CMSPages/GetResource.ashx?stylesheetname=SB/CMSPages/GetResource.ashx?styleshe... https://www.sazimebudoucnost.cz/CMSPages/GetResource.ashx?stylesheetname=SB — 200 — 17.6 KiB — 51 ms — h2https://www.sazimebudoucnost.cz/App_Themes/Common/js/jquery-1.12.0.min.js/App_Themes/Common/js/jquery-1.12.0... https://www.sazimebudoucnost.cz/App_Themes/Common/js/jquery-1.12.0.min.js — 200 — 95.3 KiB — 92 ms — h2https://www.sazimebudoucnost.cz/app_themes/common/web-components/popup/popup-component.js?v=2026026041/app_themes/common/web-components/p... https://www.sazimebudoucnost.cz/app_themes/common/web-components/popup/popup-component.js?v=2026026041 — 200 — 1.9 KiB — 44 ms — h2https://www.sazimebudoucnost.cz/app_themes/common/web-components/cookies-consent/cookies-consent.js?v=2026026041/app_themes/common/web-components/c... https://www.sazimebudoucnost.cz/app_themes/common/web-components/cookies-consent/cookies-consent.js?v=2026026041 — 200 — 4.3 KiB — 47 ms — h2https://www.sazimebudoucnost.cz/WebResource.axd?d=pynGkmcFUV13He1Qd6_TZFA2g95lCOqoH6nSqbFTyLNf_7T9cbDkmHJKkgnp3zpS3JgvKJO8IuMIl0zH6Sk_7g2&t=638901608248157332/WebResource.axd?d=pynGkmcFUV13He1Q... https://www.sazimebudoucnost.cz/WebResource.axd?d=pynGkmcFUV13He1Qd6_TZFA2g95lCOqoH6nSqbFTyLNf_7T9cbDkmHJKkgnp3zpS3JgvKJO8IuMIl0zH6Sk_7g2&t=638901608248157332 — 200 — 22.7 KiB — 60 ms — h2https://www.sazimebudoucnost.cz/ScriptResource.axd?d=NJmAwtEo3Ipnlaxl6CMhvgMeG8D8ThhD1P0Pzsyjwpgj3MsPS8JNB9pScZ_ZCWoYqXLdT3YBN650L8BnvyBa1emY_Fqi2LE08z-Zqx4qH443tiMviplXhvCQttquaEQmxeVPP4vvTYQyDf4EPR8NzT4dF2X1aqSoX3-AuosObeY1&t=5c0e0825/ScriptResource.axd?d=NJmAwtEo3Ipnl... https://www.sazimebudoucnost.cz/ScriptResource.axd?d=NJmAwtEo3Ipnlaxl6CMhvgMeG8D8ThhD1P0Pzsyjwpgj3MsPS8JNB9pScZ_ZCWoYqXLdT3YBN650L8BnvyBa1emY_Fqi2LE08z-Zqx4qH443tiMviplXhvCQttquaEQmxeVPP4vvTYQyDf4EPR8NzT4dF2X1aqSoX3-AuosObeY1&t=5c0e0825 — 200 — 25.1 KiB — 94 ms — h2https://www.sazimebudoucnost.cz/ScriptResource.axd?d=dwY9oWetJoJoVpgL6Zq8OO8Gp-vUFKlsKvhnipRbKE4k3yKpgTUAjTmzN3lYHnVcTOIiu6jxD8qRXe5y7idjSEmIRlPkDTNzSy7uMokaqexnOulKPozBoijUfZZeSsOxPV9_M_1glotS4TNxXqRENw0ipnbNOKi4m3aVxBmx40k1&t=5c0e0825/ScriptResource.axd?d=dwY9oWetJoJoV... https://www.sazimebudoucnost.cz/ScriptResource.axd?d=dwY9oWetJoJoVpgL6Zq8OO8Gp-vUFKlsKvhnipRbKE4k3yKpgTUAjTmzN3lYHnVcTOIiu6jxD8qRXe5y7idjSEmIRlPkDTNzSy7uMokaqexnOulKPozBoijUfZZeSsOxPV9_M_1glotS4TNxXqRENw0ipnbNOKi4m3aVxBmx40k1&t=5c0e0825 — 200 — 9.9 KiB — 67 ms — h2https://www.sazimebudoucnost.cz/App_Themes/SazimeBudoucnost/favicons/site.webmanifest?v=kPv3qQQdJR/App_Themes/SazimeBudoucnost/favico... https://www.sazimebudoucnost.cz/App_Themes/SazimeBudoucnost/favicons/site.webmanifest?v=kPv3qQQdJR — 200 — 1.3 KiB — 138 ms — h2https://www.sazimebudoucnost.cz/getattachment/1acf4715-ec70-4362-a41a-581be1fdb615/bg?width=1600/getattachment/1acf4715-ec70-4362-a... https://www.sazimebudoucnost.cz/getattachment/1acf4715-ec70-4362-a41a-581be1fdb615/bg?width=1600 — 200 — 311.3 KiB — 132 ms — h2https://www.sazimebudoucnost.cz/getmedia/05a7c50f-ee5a-4c9e-956e-92c4ef587ce6/mapa-loading.jpg?width=1600/getmedia/05a7c50f-ee5a-4c9e-956e-9... https://www.sazimebudoucnost.cz/getmedia/05a7c50f-ee5a-4c9e-956e-92c4ef587ce6/mapa-loading.jpg?width=1600 — 200 — 253.9 KiB — 62 ms — h2https://www.sazimebudoucnost.cz/App_Themes/Bootstrap-4.3.1/js/bootstrap.min.js/App_Themes/Bootstrap-4.3.1/js/boot... https://www.sazimebudoucnost.cz/App_Themes/Bootstrap-4.3.1/js/bootstrap.min.js — 200 — 56.8 KiB — 52 ms — h2https://www.sazimebudoucnost.cz/App_Themes/Common/js/slick.min.js/App_Themes/Common/js/slick.min.js https://www.sazimebudoucnost.cz/App_Themes/Common/js/slick.min.js — 200 — 42.0 KiB — 43 ms — h2https://www.sazimebudoucnost.cz/App_Themes/common/js/angular.min.js/App_Themes/common/js/angular.min.j... https://www.sazimebudoucnost.cz/App_Themes/common/js/angular.min.js — 200 — 156.4 KiB — 44 ms — h2https://www.sazimebudoucnost.cz/App_Themes/common/js/underscore-min.js/App_Themes/common/js/underscore-mi... https://www.sazimebudoucnost.cz/App_Themes/common/js/underscore-min.js — 200 — 16.2 KiB — 38 ms — h2https://www.sazimebudoucnost.cz/App_Themes/common/js/si-table.min.js/App_Themes/common/js/si-table.min.... https://www.sazimebudoucnost.cz/App_Themes/common/js/si-table.min.js — 200 — 5.4 KiB — 45 ms — h2https://www.sazimebudoucnost.cz/App_Themes/common/js/angular-sanitize.js/App_Themes/common/js/angular-sanit... https://www.sazimebudoucnost.cz/App_Themes/common/js/angular-sanitize.js — 200 — 23.5 KiB — 44 ms — h2https://www.sazimebudoucnost.cz/App_Themes/SazimeBudoucnost/js/sb.js/App_Themes/SazimeBudoucnost/js/sb.... https://www.sazimebudoucnost.cz/App_Themes/SazimeBudoucnost/js/sb.js — 200 — 3.8 KiB — 48 ms — 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https://pagead2.googlesyndication.com/ccm/collect?rcb=17&frm=0&apvc=0&ae=g&tid=AW-788450732&dl=https%3A%2F%2Fwww.sazimebudoucnost.cz%2F&scrsrc=www.googletagmanager.com&rnd=2090185357.1787919132&navt=n&npa=1&_tu=CA&gtm=45be68q1v9244455294z8813070017za20gzb813070017zd813070017xea&gcs=G100&gcd=13p3p3p2p5l1&dma_cps=-&dma=1&tag_exp=115616986~115938465~115938469~118012008~118897920~118897930~120385423&tft=1787919132567&tfd=837&tids=AW-788450732&fmt=8 — 200 — 21 B — 28 ms — h3https://www.sazimebudoucnost.cz/App_Themes/SazimeBudoucnost/favicons/favicon.ico?v=kPv3qQQdJR/App_Themes/SazimeBudoucnost/favico... https://www.sazimebudoucnost.cz/App_Themes/SazimeBudoucnost/favicons/favicon.ico?v=kPv3qQQdJR — 200 — 14.8 KiB — 32 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
23% of JavaScript execution is third-party
First-party Third-party 125ms · 348KB · Kč15/mo
Google Tag Manager
Tag Manager
Optional
Execution 65ms
Transfer 167 KB
Unused 42%
Monthly Cost Kč8/mo
Google Tag Manager
Tag Manager
Optional
Execution 60ms
Transfer 181 KB
Unused 41%
Monthly Cost Kč7/mo

How third-party costs are calculated

Real-User Performance (CrUX)
Field metrics from the Chrome User Experience Report
INFO

Chrome User Experience (CrUX)

Real-user metrics from the Chrome UX Report (2026-07-30 — 2026-08-26)

LCP (p75)

1613 ms

86% good

INP (p75)

124 ms

92% good

CLS (p75)

0.010

98% good

FCP (p75)

1413 ms

TTFB (p75)

702 ms

This origin passes Core Web Vitals assessment
Image Optimization
62 images, 157 KB total, 0 KB wasted
INFO

Image Optimization Audit

Total Images

62

Total Size

157 KB

9 missing alt text 61 missing dimensions 61 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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