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Performance

· 27 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
80
GRADE
B
FIX
4
REVIEW
7
PASS
12
INFO
4

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

Mobile Desktop
56
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.
81
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.

2.82 s

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

4.90 s

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

793 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.

4.75 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.

12.80 s

Page Load Progression

452 ms
904 ms
1.4 s
1.8 s
2.3 s
2.7 s
3.2 s
3.6 s
Checks
27
12 PASS 7 REVIEW 4 FIX
D
JS Execution Cost
Action
3309ms total JS execution
FIX
3309ms total JS execution
Warning::
https://www.sazimebudoucnost.cz/: 1293ms CPU time
Warning::
https://www.sazimebudoucnost.cz/App_Themes/Common/...: 428ms CPU time
Warning::
Unattributable: 377ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-N0TR...: 292ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-5VR...: 265ms CPU time
Info::
Third-party scripts: 1092ms (33% of total)

Main Thread Breakdown

Script Evaluation 35% Other 25% Style & Layout 20% Rendering 9% Script Parsing & Compilation 7%
ScriptTotalScriptingParse/CompileParty
https://www.sazimebudoucnost.cz/1293ms23ms7ms1st
https://www.sazimebudoucnost.cz/App_Themes/Common/js/jquery-1.12.0.min.js428ms198ms8ms1st
Unattributable377ms8ms0ms1st
https://www.googletagmanager.com/gtag/js?id=G-N0TREDT34H&cx=c&gtm=4e68q1292ms233ms52ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5VR2TV4265ms219ms42ms3rd
https://www.googletagmanager.com/gtag/js?id=GT-MBLW7787&cx=c&gtm=4e68q1196ms158ms37ms3rd
https://www.googletagmanager.com/gtag/destination?id=AW-788450732&cx=c&gtm=4e68q1140ms110ms29ms3rd
https://c.seznam.cz/js/rc.js100ms84ms15ms3rd
https://www.googletagmanager.com/gtag/js?id=AW-788450732&cx=c&gtm=4e68q199ms71ms27ms3rd
https://www.sazimebudoucnost.cz/App_Themes/Global/lazysizes.min.js61ms24ms1ms1st

Showing top 10 of 11 scripts

F
JS Bundles
Action
24 scripts, 645 KB unused
FIX
24 scripts, 645 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/destination?...: 72 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-N0TR...: 72 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-5VR...: 70 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 645 KB
645 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/destination?id=AW-788450732&cx=c&gtm=4e68q1146 KB72 KB (49%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-N0TREDT34H&cx=c&gtm=4e68q1181 KB72 KB (40%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5VR2TV4167 KB70 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/Bootstrap-4.3.1/js/bootstrap.min.js57 KB43 KB (75%)✓1st
https://www.sazimebudoucnost.cz/App_Themes/Common/js/jquery-1.12.0.min.js95 KB42 KB (44%)✓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
49 resources · 1.7 MB · 645 KB savings available
FIX
49 resources · 1.7 MB · 645 KB savings available
Warning::
Page weight 1.7 MB exceeds 1 MB target by 762 KB
Got: 1.7 MB Expected: ≤ 1 MB
Info::
~645 KB of savings available
Warning::
16 third-party resources (53% of weight)
49 resources · 1.7 MiB · 16 third-party 762.0 KiB over 1MB target
JavaScript 74% · 1.3 MiB
Image 15% · 263.9 KiB
Font 6% · 101.4 KiB
CSS 3% · 58.7 KiB
Document 2% · 39.4 KiB
Other 0% · 1.9 KiB

~645.2 KiB of savings available

Remove unused JavaScript: 645.2 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
C
Page Weight Budget
Action
1.7 MB transferred, 49 requests
REVIEW
1.7 MB transferred, 49 requests
Info::
Page weighs 3.9 MB (1.7 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::
49 HTTP requests
Info::
Estimated 0.37 g CO2 per page load
1.7 MB / 2.4 MB budget
1.7 MB transferred
49 requests
0.37 g CO2 per page load
JavaScript 1.3 MiB 74%
Images 249.1 KiB 14%
Fonts 101.4 KiB 6%
CSS 58.7 KiB 3%
HTML 39.4 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

B
Third-Party Impact
53% third-party, 0 ms blocking
REVIEW
53% third-party, 0 ms blocking
Warning::
Third-party code accounts for 53% of page weight (946.2 KiB of 1.7 MiB)
Info::
Third-party blocking time is low (0 ms)
47%
53%
First-party Third-party
B
Image Optimization
11 images, 0 KB saveable
REVIEW
11 images, 0 KB saveable
Warning::
is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
11 images 249 KB
0 oversized -0 KB
10 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
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 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 2.8 s LCP 4.9 shttps://fonts.gstatic.com/s/montserrat/v31/JTUSjIg1_i6t8kCHKm459WlhyyTh89Y.woff2JTUSjIg1_i6t8kCHKm459Wl... https://fonts.gstatic.com/s/montserrat/v31/JTUSjIg1_i6t8kCHKm459WlhyyTh89Y.woff2 — 34.7 KiB — 38 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 — 54 ms — font-display: swap
JTUSjIg1_i6t8kCHKm459Wl... woff2 swap
Size 35 KB
Load time 38 ms
Start 702 ms
Risk FOUT — text flashes from fallback to web font
JTUSjIg1_i6t8kCHKm459Wd... woff2 swap
Size 67 KB
Load time 54 ms
Start 702 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
6 hints, 0 missing preconnects
PASS
6 hints, 0 missing preconnects
Info::
Page uses 6 resource hint(s)

Current Resource Hints

preconnect
—
preload
6
dns-prefetch
—
prefetch
—

6 resource hints configured

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.
A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
A
JavaScript Blocking
1 JS blocking issue(s) detected
PASS
1 JS blocking issue(s) detected
Warning::
4 render-blocking <script src> tag(s) without async/defer
Each `<script src=...>` without `async`, `defer`, or `type="module"` blocks HTML parsing while the browser fetches and executes it. The block lasts the entire round-trip + execution time -- on slow networks this translates directly into LCP delay. Add `defer` (executes after parse, in source order) for scripts that interact with the DOM, or `async` (executes whenever ready) for analytics / independent scripts. Module scripts (`type="module"`) are deferred by default.
A
CSS Performance Depth
1 CSS depth issue(s) detected
PASS
1 CSS depth issue(s) detected
Warning::
6 render-blocking stylesheet(s) -- recommended: <=3
Each `<link rel="stylesheet">` without a non-blocking `media` attribute holds up the first paint. Browsers download all of them before painting any content. Consolidate into 1-2 critical-path stylesheets; defer non-critical CSS via `<link rel="stylesheet" media="print" onload="this.media='all'">` or via the loadCSS pattern; inline above-the-fold CSS in `<style>` to short-circuit the request entirely.
Network Waterfall
49 requests over 1317ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 2.8 s LCP 4.9 shttps://www.sazimebudoucnost.cz// https://www.sazimebudoucnost.cz/ — 200 — 39.4 KiB — 516 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 — 102 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 — 48 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 — 55 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 — 567 B — 45 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 — 885 B — 42 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 — 91 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 — 95.2 KiB — 84 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 — 47 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 — 49 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 — 57 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 — 63 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 — 9.8 KiB — 60 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 — 139 ms — h2https://www.sazimebudoucnost.cz/getattachment/1acf4715-ec70-4362-a41a-581be1fdb615/bg?width=800/getattachment/1acf4715-ec70-4362-a... 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h3https://region1.google-analytics.com/g/collect?v=2&tid=G-N0TREDT34H&gtm=45je68q1v878113023z8813070017za20gzb813070017zd813070017&_p=1787919116868&gcs=G100&gcd=13p3pPp2p5l1&npa=1&dma_cps=-&dma=1&_eu=EAAAACAC&are=1&cid=1533189010.1787919117&frm=0&ibt=1&ir=1&ngs=1&pscdl=denied&rcb=19&sr=412x823&uaa=&uab=64&uafvl=Chromium%3B151.0.7922.173%7CNot%253DA%253FBrand%3B99.0.0.0&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=115938466~115938469~118897920~118897930~120213116~120385423~120420415&sid=1787919117&sct=1&seg=0&dl=https%3A%2F%2Fwww.sazimebudoucnost.cz%2F&dt=S%C3%A1z%C3%ADme%20budoucnost%20%E2%80%93%20S%C3%A1z%C3%ADme%20budoucnost%20-%20Pro%20odoln%C3%A1%20m%C4%9Bsta%20a%20zdravou%20krajinu&en=page_view&_fv=1&_nsi=1&_ss=1&tfd=1145region1.google-analytics.com/g/coll... https://region1.google-analytics.com/g/collect?v=2&tid=G-N0TREDT34H&gtm=45je68q1v878113023z8813070017za20gzb813070017zd813070017&_p=1787919116868&gcs=G100&gcd=13p3pPp2p5l1&npa=1&dma_cps=-&dma=1&_eu=EAAAACAC&are=1&cid=1533189010.1787919117&frm=0&ibt=1&ir=1&ngs=1&pscdl=denied&rcb=19&sr=412x823&uaa=&uab=64&uafvl=Chromium%3B151.0.7922.173%7CNot%253DA%253FBrand%3B99.0.0.0&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=115938466~115938469~118897920~118897930~120213116~120385423~120420415&sid=1787919117&sct=1&seg=0&dl=https%3A%2F%2Fwww.sazimebudoucnost.cz%2F&dt=S%C3%A1z%C3%ADme%20budoucnost%20%E2%80%93%20S%C3%A1z%C3%ADme%20budoucnost%20-%20Pro%20odoln%C3%A1%20m%C4%9Bsta%20a%20zdravou%20krajinu&en=page_view&_fv=1&_nsi=1&_ss=1&tfd=1145 — 204 — 555 B — 113 ms — h2https://www.googletagmanager.com/td?id=G-N0TREDT34H&mde=AW-788450732;0_1&v=3&t=t&pid=887313052&gtm=45je68q1v878113023za20gzb813070017zd813070017&seq=1&exp=115938466~115938469~118897920~118897930~120213116~120385423~120420415&dl=www.sazimebudoucnost.cz%2F&tdp=G-N0TREDT34H;78113023;1;6;0&frm=0&rtg=13070017&slo=13&hlo=2&lst=1&pcid=13070017&bt=0&ct=3&jsp=11~12~17&z=0www.googletagmanager.com/td?id=G-N0... https://www.googletagmanager.com/td?id=G-N0TREDT34H&mde=AW-788450732;0_1&v=3&t=t&pid=887313052&gtm=45je68q1v878113023za20gzb813070017zd813070017&seq=1&exp=115938466~115938469~118897920~118897930~120213116~120385423~120420415&dl=www.sazimebudoucnost.cz%2F&tdp=G-N0TREDT34H;78113023;1;6;0&frm=0&rtg=13070017&slo=13&hlo=2&lst=1&pcid=13070017&bt=0&ct=3&jsp=11~12~17&z=0 — 204 — 18 B — 127 ms — h3https://c.seznam.cz/retargeting?id=115684&url=https%3A%2F%2Fwww.sazimebudoucnost.cz%2F&consent=0c.seznam.cz/retargeting?id=115684&u... https://c.seznam.cz/retargeting?id=115684&url=https%3A%2F%2Fwww.sazimebudoucnost.cz%2F&consent=0 — 200 — 308 B — 38 ms — h2https://pagead2.googlesyndication.com/ccm/collect?rcb=11&frm=0&apvc=0&ae=g&tid=AW-788450732&dl=https%3A%2F%2Fwww.sazimebudoucnost.cz%2F&scrsrc=www.googletagmanager.com&rnd=125136411.1787919117&navt=n&npa=1&_tu=CA&gtm=45be68q1v9244455294z8813070017za20gzb813070017zd813070017xea&gcs=G100&gcd=13p3p3p2p5l1&dma_cps=-&dma=1&tag_exp=115938466~115938468~118897920~118897930~120385422~120474862&tft=1787919117611&tfd=1257&tids=AW-788450732&fmt=8pagead2.googlesyndication.com/ccm/c... https://pagead2.googlesyndication.com/ccm/collect?rcb=11&frm=0&apvc=0&ae=g&tid=AW-788450732&dl=https%3A%2F%2Fwww.sazimebudoucnost.cz%2F&scrsrc=www.googletagmanager.com&rnd=125136411.1787919117&navt=n&npa=1&_tu=CA&gtm=45be68q1v9244455294z8813070017za20gzb813070017zd813070017xea&gcs=G100&gcd=13p3p3p2p5l1&dma_cps=-&dma=1&tag_exp=115938466~115938468~118897920~118897930~120385422~120474862&tft=1787919117611&tfd=1257&tids=AW-788450732&fmt=8 — 200 — 21 B — 30 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
33% of JavaScript execution is third-party
First-party Third-party 1092ms · 843KB · Kč135/mo
Google Tag Manager
Tag Manager
Costly
Execution 292ms
Transfer 181 KB
Unused 40%
Monthly Cost Kč36/mo
Google Tag Manager
Tag Manager
Costly
Execution 265ms
Transfer 167 KB
Unused 42%
Monthly Cost Kč33/mo
Google Tag Manager
Tag Manager
Optional
Execution 196ms
Transfer 155 KB
Unused 44%
Monthly Cost Kč24/mo
Google Tag Manager
Tag Manager
Optional
Execution 140ms
Transfer 146 KB
Unused 49%
Monthly Cost Kč17/mo
c.seznam.cz
Other
Optional
Execution 100ms
Transfer 51 KB
Unused 60%
Monthly Cost Kč12/mo
Google Tag Manager
Tag Manager
Optional
Execution 99ms
Transfer 143 KB
Unused 61%
Monthly Cost Kč12/mo

These scripts may cost more than they're worth

  • Google Tag Manager adds 292ms and costs ~Kč36/month
  • Google Tag Manager adds 265ms and costs ~Kč33/month

Google Tag Manager takes 292ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

Google Tag Manager takes 265ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

60% of c.seznam.cz's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

61% of Google Tag Manager's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

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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