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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
76
GRADE
C
FIX
5
REVIEW
3
PASS
7
INFO
2

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

Mobile Desktop
44
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
89
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
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.

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

Page Load Progression

690 ms
1.4 s
2.1 s
2.8 s
3.4 s
4.1 s
4.8 s
5.5 s
Checks
17
7 PASS 3 REVIEW 5 FIX
D
Page Weight Budget
Action
2.2 MB transferred, 83 requests
FIX
2.2 MB transferred, 83 requests
Info::
Page weighs 2.6 MB (2.2 MB transferred)
Warning::
Images are 1.4 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.4 MB
Info::
83 HTTP requests
Info::
Estimated 0.46 g CO2 per page load
2.2 MB / 2.4 MB budget
2.2 MB transferred
83 requests
0.46 g CO2 per page load
Images 1.4 MiB 62%
JavaScript 490.1 KiB 22%
CSS 185.6 KiB 8%
HTML 86.2 KiB 4%
Fonts 72.4 KiB 3%
Other 15.8 KiB 1%
Other 363 B 0%
0 2.4 MB 4.9 MB
Approaching limit

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (2.2 MiB of 2.2 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
3474ms total JS execution
FIX
3474ms total JS execution
Warning::
https://www.avcr.cz/cs/: 1349ms CPU time
Warning::
https://ajax.googleapis.com/ajax/libs/jquery/1.11....: 987ms CPU time
Warning::
Unattributable: 675ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-ETQE...: 239ms CPU time
Info::
https://www.avcr.cz/system/modules/cz.nelasoft.ope...: 111ms CPU time
Warning::
Third-party scripts: 3474ms (100% of total)

Main Thread Breakdown

Style & Layout 29% Script Evaluation 29% Other 27% Rendering 8% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://www.avcr.cz/cs/1349ms499ms9ms3rd
https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js987ms170ms13ms3rd
Unattributable675ms11ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-ETQEE59TKV239ms189ms48ms3rd
https://www.avcr.cz/system/modules/cz.nelasoft.opencms.avcr/resources/js/modernizr.js111ms67ms2ms3rd
https://www.avcr.cz/system/modules/cz.nelasoft.opencms.avcr/resources/js/cookieconsent-init.js58ms28ms2ms3rd
https://www.avcr.cz/system/modules/cz.nelasoft.opencms.avcr/resources/js/jquery-ui.min.js55ms32ms11ms3rd
D
Page Weight Inventory
Action
83 resources · 2.2 MB · 238 KB savings available
FIX
83 resources · 2.2 MB · 238 KB savings available
Warning::
Page weight 1.2 MB over 1MB target
Got: 2.2 MB Expected: ≤ 1 MB
Info::
~238 KB of savings available
Warning::
82 third-party resources (100% of weight)
83 resources · 2.2 MiB · 82 third-party 1.2 MiB over 1MB target
Image 63% · 1.4 MiB
JavaScript 22% · 490.1 KiB
CSS 8% · 185.6 KiB
Document 4% · 86.6 KiB
Font 3% · 72.7 KiB
Other 0% · 363 B

~237.7 KiB of savings available

Remove unused JavaScript: 237.7 KiB
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

C
Image Optimization
Action
51 images, 0 KB saveable
REVIEW
51 images, 0 KB saveable
Warning::
https://www.avcr.cz/export/sites/avcr.cz/.content/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.avcr.cz/export/sites/avcr.cz/.content/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.avcr.cz/export/sites/avcr.cz/.content/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.avcr.cz/export/sites/avcr.cz/.content/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.avcr.cz/export/sites/avcr.cz/.content/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.avcr.cz/export/sites/avcr.cz/.content/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.avcr.cz/export/sites/avcr.cz/.content/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.avcr.cz/export/sites/avcr.cz/.content/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.avcr.cz/export/sites/avcr.cz/.content/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.avcr.cz/.content/galerie-obrazku/aktua... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.avcr.cz/export/sites/avcr.cz/.content/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.avcr.cz/export/sites/avcr.cz/.content/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.avcr.cz/export/sites/avcr.cz/.content/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.avcr.cz/export/sites/avcr.cz/.content/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.avcr.cz/export/sites/avcr.cz/.content/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.avcr.cz/export/sites/avcr.cz/.content/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.avcr.cz/export/sites/avcr.cz/.content/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.avcr.cz/export/sites/avcr.cz/.content/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.avcr.cz/export/sites/avcr.cz/.content/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.avcr.cz/export/sites/avcr.cz/.content/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.avcr.cz/export/sites/avcr.cz/.content/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.avcr.cz/export/sites/avcr.cz/.content/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.avcr.cz/export/sites/avcr.cz/.content/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.avcr.cz/export/sites/avcr.cz/.content/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
51 images 1.4 MB
0 oversized -0 KB
51 legacy format
24 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

C
JS Bundles
Action
12 scripts, 238 KB unused
REVIEW
12 scripts, 238 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-ETQE...: 86 KB unused (55%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.avcr.cz/export/system/modules/cz.nelas...: 65 KB unused (82%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.avcr.cz/system/modules/cz.nelasoft.ope...: 65 KB unused (88%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.avcr.cz/system/modules/cz.nelasoft.ope...: 22 KB unused (93%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 238 KB
238 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-ETQEE59TKV157 KB86 KB (55%)✓3rd
https://www.avcr.cz/export/system/modules/cz.nelasoft.opencms.media/resources/build/mediaelement-and-player.min.js80 KB65 KB (82%)✓3rd
https://www.avcr.cz/system/modules/cz.nelasoft.opencms.avcr/resources/js/jquery-ui.min.js74 KB65 KB (88%)✓3rd
https://www.avcr.cz/system/modules/cz.nelasoft.opencms.avcr/resources/js/owl.carousel.min.js24 KB22 KB (93%)✓3rd
https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js33 KB—✓3rd
https://www.avcr.cz/system/modules/cz.nelasoft.opencms.avcr/resources/js/modernizr.js15 KB—✓3rd
https://www.avcr.cz/system/modules/cz.nelasoft.opencms.avcr/resources/js/dropdown.js5 KB—✓3rd
https://www.avcr.cz/system/modules/cz.nelasoft.opencms.avcr/resources/js/jquery.dotdotdot.min.js6 KB—✓3rd
https://www.avcr.cz/system/modules/cz.osw.opencms.types/resources/slick-photos/slick/slick.min.js52 KB—✓3rd
https://osw-analytics3.avcr.cz/js/plausible.manual.file-downloads.js3 KB—✓3rd

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

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
3 fonts (73 KB)
PASS
3 fonts (73 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

73 KB total

Render-blocking

0

of 3

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 6.0 s 7.0 s 8.0 s FCP 7.0 s LCP 8.2 shttps://netdna.bootstrapcdn.com/font-awesome/4.6.3/fonts/fontawesome-webfont.woff2?v=4.6.3fontawesome-webfont.woff2 https://netdna.bootstrapcdn.com/font-awesome/4.6.3/fonts/fontawesome-webfont.woff2?v=4.6.3 — 70.8 KiB — 35 ms — font-display: swaphttps://www.avcr.cz/system/modules/cz.osw.opencms.types/resources/slick-photos/slick/fonts/slick.woffslick.woff https://www.avcr.cz/system/modules/cz.osw.opencms.types/resources/slick-photos/slick/fonts/slick.woff — 300 B — 216 ms — font-display: swaphttps://www.avcr.cz/export/system/modules/cz.osw.opencms.types/resources/slick-photos/slick/fonts/slick.woffslick.woff https://www.avcr.cz/export/system/modules/cz.osw.opencms.types/resources/slick-photos/slick/fonts/slick.woff — 1.6 KiB — 161 ms — font-display: swap
fontawesome-webfont.woff2 woff2 swap
Size 71 KB
Load time 35 ms
Start 3.7 s
Risk FOUT — text flashes from fallback to web font
slick.woff woff swap
Size 0 KB
Load time 216 ms
Start 3.7 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
slick.woff woff swap
Size 2 KB
Load time 161 ms
Start 3.9 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
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)

Fixing the unchecked items could save ~1 KB and ~2 ms

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+
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
Network Waterfall
83 requests over 5517ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s FCP 7.0 s LCP 8.2 shttps://cas.cz// https://cas.cz/ — 301 — 279 B — 796 ms — http/1.1https://www.avcr.cz/www.avcr.cz/ https://www.avcr.cz/ — 301 — 174 B — 665 ms — http/1.1https://www.avcr.cz/cs/www.avcr.cz/cs/ https://www.avcr.cz/cs/ — 200 — 86.2 KiB — 1.2 s — http/1.1https://www.avcr.cz/export/system/modules/cz.nelasoft.opencms.avcr/resources/css/main.csswww.avcr.cz/export/system/modules/c... https://www.avcr.cz/export/system/modules/cz.nelasoft.opencms.avcr/resources/css/main.css — 200 — 71.4 KiB — 614 ms — http/1.1https://www.avcr.cz/export/system/modules/cz.nelasoft.opencms.avcr/resources/css/owl.carousel.csswww.avcr.cz/export/system/modules/c... https://www.avcr.cz/export/system/modules/cz.nelasoft.opencms.avcr/resources/css/owl.carousel.css — 200 — 1.7 KiB — 615 ms — http/1.1https://www.avcr.cz/export/system/modules/cz.nelasoft.opencms.avcr/resources/css/custom.csswww.avcr.cz/export/system/modules/c... https://www.avcr.cz/export/system/modules/cz.nelasoft.opencms.avcr/resources/css/custom.css — 200 — 33.5 KiB — 779 ms — http/1.1https://www.avcr.cz/export/system/modules/cz.nelasoft.opencms.avcr/resources/css/owl.theme.csswww.avcr.cz/export/system/modules/c... https://www.avcr.cz/export/system/modules/cz.nelasoft.opencms.avcr/resources/css/owl.theme.css — 200 — 1.9 KiB — 636 ms — http/1.1https://www.avcr.cz/export/system/modules/cz.nelasoft.opencms.avcr/resources/css/ukraine.csswww.avcr.cz/export/system/modules/c... https://www.avcr.cz/export/system/modules/cz.nelasoft.opencms.avcr/resources/css/ukraine.css — 200 — 3.0 KiB — 632 ms — http/1.1https://www.avcr.cz/export/system/modules/cz.nelasoft.opencms.avcr/resources/css/jeduvedu/jeduvedu.csswww.avcr.cz/export/system/modules/c... https://www.avcr.cz/export/system/modules/cz.nelasoft.opencms.avcr/resources/css/jeduvedu/jeduvedu.css — 200 — 15.8 KiB — 790 ms — http/1.1https://www.avcr.cz/export/system/modules/cz.nelasoft.opencms.avcr/resources/css/jeduvedu/jeduveduCustom.csswww.avcr.cz/export/system/modules/c... https://www.avcr.cz/export/system/modules/cz.nelasoft.opencms.avcr/resources/css/jeduvedu/jeduveduCustom.css — 200 — 392 B — 774 ms — http/1.1https://www.avcr.cz/export/system/modules/cz.osw.opencms.types/resources/slick-photos/slick-photos.min.csswww.avcr.cz/export/system/modules/c... https://www.avcr.cz/export/system/modules/cz.osw.opencms.types/resources/slick-photos/slick-photos.min.css — 200 — 5.0 KiB — 768 ms — http/1.1https://netdna.bootstrapcdn.com/font-awesome/4.6.3/css/font-awesome.cssnetdna.bootstrapcdn.com/font-awesom... https://netdna.bootstrapcdn.com/font-awesome/4.6.3/css/font-awesome.css — 200 — 7.4 KiB — 26 ms — h3https://www.avcr.cz/export/system/modules/cz.nelasoft.opencms.media/resources/build/mediaelementplayer.csswww.avcr.cz/export/system/modules/c... 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HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
100% of JavaScript execution is third-party
First-party Third-party 3474ms · 387KB · Kč429/mo
www.avcr.cz
Other
Costly
Execution 1349ms
Transfer 86 KB
Monthly Cost Kč166/mo
ajax.googleapis.com
Other
Costly
Execution 987ms
Transfer 33 KB
Monthly Cost Kč122/mo
Unattributable
Other
Costly
Execution 675ms
Transfer 0 KB
Monthly Cost Kč83/mo
Google Tag Manager
Tag Manager
Costly
Execution 239ms
Transfer 157 KB
Unused 55%
Monthly Cost Kč30/mo
www.avcr.cz
Other
Optional
Execution 111ms
Transfer 15 KB
Monthly Cost Kč14/mo
www.avcr.cz
Other
Optional
Execution 58ms
Transfer 21 KB
Monthly Cost Kč7/mo
www.avcr.cz
Other
Optional
Execution 55ms
Transfer 74 KB
Unused 88%
Monthly Cost Kč7/mo

These scripts may cost more than they're worth

  • www.avcr.cz adds 1349ms and costs ~Kč166/month
  • ajax.googleapis.com adds 987ms and costs ~Kč122/month
  • Unattributable adds 675ms and costs ~Kč83/month
  • Google Tag Manager adds 239ms and costs ~Kč30/month

100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

When third-party JS execution time exceeds your own, performance gains from frontend work are capped by code you don't own.

Learn more ▾

Every millisecond of third-party JS competes with your own for main-thread time. If their share is bigger than yours, optimization on your code base barely moves the needle. Audit, defer, or remove third-parties before further frontend optimization. Use Lighthouse's third-party audit to identify the worst offenders.

Source: web.dev

www.avcr.cz takes 1349ms 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

ajax.googleapis.com takes 987ms 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

Unattributable takes 675ms 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 239ms 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

55% 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

88% of www.avcr.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

How third-party costs are calculated

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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