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https://cas.cz

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
76
GRADE
C
FIX
4
REVIEW
4
PASS
5
INFO
2

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

Mobile Desktop
61
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
93
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
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.

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

Page Load Progression

714 ms
1.4 s
2.1 s
2.9 s
3.6 s
4.3 s
5.0 s
5.7 s
Checks
15
5 PASS 4 REVIEW 4 FIX
D
Page Weight Budget
Action
2.2 MB transferred, 85 requests
FIX
2.2 MB transferred, 85 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::
85 HTTP requests
Info::
Estimated 0.46 g CO2 per page load
2.2 MB / 2.4 MB budget
2.2 MB transferred
85 requests
0.46 g CO2 per page load
Images 1.4 MiB 63%
JavaScript 490.1 KiB 22%
CSS 185.6 KiB 8%
HTML 86.2 KiB 4%
Fonts 70.8 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
Page Weight Inventory
Action
85 resources · 2.2 MB · 258 KB savings available
FIX
85 resources · 2.2 MB · 258 KB savings available
Warning::
Page weight 1.2 MB over 1MB target
Got: 2.2 MB Expected: ≤ 1 MB
Info::
~258 KB of savings available
Warning::
84 third-party resources (100% of weight)
85 resources · 2.2 MiB · 84 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% · 70.8 KiB
Other 0% · 363 B

~257.9 KiB of savings available

Remove unused JavaScript: 257.9 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
54 images, 0 KB saveable
REVIEW
54 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/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.
54 images 1.4 MB
0 oversized -0 KB
54 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

B
JS Execution Cost
723ms total JS execution
REVIEW
723ms total JS execution
Warning::
https://www.avcr.cz/cs/: 304ms CPU time
Info::
https://ajax.googleapis.com/ajax/libs/jquery/1.11....: 201ms CPU time
Info::
Unattributable: 155ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-ETQE...: 63ms CPU time
Warning::
Third-party scripts: 723ms (100% of total)

Main Thread Breakdown

Other 29% Style & Layout 29% Script Evaluation 24% Rendering 13% Script Parsing & Compilation 3%
ScriptTotalScriptingParse/CompileParty
https://www.avcr.cz/cs/304ms65ms2ms3rd
https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js201ms35ms3ms3rd
Unattributable155ms3ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-ETQEE59TKV63ms50ms12ms3rd
C
JS Bundles
Action
12 scripts, 258 KB unused
REVIEW
12 scripts, 258 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.
Warning::
https://www.avcr.cz/system/modules/cz.osw.opencms....: 20 KB unused (39%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 258 KB
258 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://www.avcr.cz/system/modules/cz.osw.opencms.types/resources/slick-photos/slick/slick.min.js52 KB20 KB (39%)✓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://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

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
1 fonts (71 KB)
PASS
1 fonts (71 KB)
Info::
1 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

1

71 KB total

Render-blocking

0

of 1

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 FCP 3.3 s LCP 3.9 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 — 36 ms — font-display: swap
fontawesome-webfont.woff2 woff2 swap
Size 71 KB
Load time 36 ms
Start 3.8 s
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
Network Waterfall
85 requests over 5705ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 3.3 s LCP 3.9 shttps://cas.cz// https://cas.cz/ — 301 — 279 B — 806 ms — http/1.1https://www.avcr.cz/www.avcr.cz/ https://www.avcr.cz/ — 301 — 174 B — 680 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 — 609 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 — 632 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 — 789 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 — 634 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 — 637 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 — 807 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 — 762 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 — 792 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 — 25 ms — h3https://www.avcr.cz/export/system/modules/cz.nelasoft.opencms.media/resources/build/mediaelementplayer.csswww.avcr.cz/export/system/modules/c... https://www.avcr.cz/export/system/modules/cz.nelasoft.opencms.media/resources/build/mediaelementplayer.css — 200 — 24.4 KiB — 946 ms — http/1.1https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.jsajax.googleapis.com/ajax/libs/jquer... https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js — 200 — 33.4 KiB — 35 ms — h2https://www.avcr.cz/system/modules/cz.nelasoft.opencms.avcr/resources/js/jquery-ui.min.jswww.avcr.cz/system/modules/cz.nelas... https://www.avcr.cz/system/modules/cz.nelasoft.opencms.avcr/resources/js/jquery-ui.min.js — 200 — 74.3 KiB — 1.1 s — http/1.1https://www.avcr.cz/export/system/modules/cz.nelasoft.opencms.media/resources/build/mediaelement-and-player.min.jswww.avcr.cz/export/system/modules/c... https://www.avcr.cz/export/system/modules/cz.nelasoft.opencms.media/resources/build/mediaelement-and-player.min.js — 200 — 79.7 KiB — 1.1 s — 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https://www.avcr.cz/favicon.ico — 200 — 15.0 KiB — 167 ms — http/1.1
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 723ms · 277KB · Kč89/mo
www.avcr.cz
Other
Costly
Execution 304ms
Transfer 86 KB
Monthly Cost Kč37/mo
ajax.googleapis.com
Other
Costly
Execution 201ms
Transfer 33 KB
Monthly Cost Kč25/mo
Unattributable
Other
Optional
Execution 155ms
Transfer 0 KB
Monthly Cost Kč19/mo
Google Tag Manager
Tag Manager
Optional
Execution 63ms
Transfer 157 KB
Unused 55%
Monthly Cost Kč8/mo

These scripts may cost more than they're worth

  • www.avcr.cz adds 304ms and costs ~Kč37/month
  • ajax.googleapis.com adds 201ms and costs ~Kč25/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 304ms 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 201ms 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

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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