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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
78
GRADE
C
FIX
4
REVIEW
1
PASS
10
INFO
2

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

Mobile Desktop
45
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
79
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
65
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
91
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.

9.15 s

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

10.15 s

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

466 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.

9.15 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.

10.16 s

Page Load Progression

574 ms
1.1 s
1.7 s
2.3 s
2.9 s
3.4 s
4.0 s
4.6 s
Checks
17
10 PASS 1 REVIEW 4 FIX
F
Page Weight Budget
Action
3.4 MB transferred, 48 requests
FIX
3.4 MB transferred, 48 requests
Warning::
Page weighs 12.9 MB (3.4 MB transferred)
Warning::
JavaScript is 1.2 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.2 MB
Info::
48 HTTP requests
Info::
Estimated 0.71 g CO2 per page load
3.4 MB / 2.4 MB budget
3.4 MB transferred
48 requests
0.71 g CO2 per page load
Other 1.7 MiB 51%
JavaScript 1.2 MiB 37%
Fonts 188.2 KiB 5%
Other 127.8 KiB 4%
CSS 69.6 KiB 2%
HTML 31.2 KiB 1%
Images 9.0 KiB 0%
Other 1.3 KiB 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

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

D
JS Execution Cost
Action
2824ms total JS execution
FIX
2824ms total JS execution
Warning::
https://jsfiddle.net/js/lib/monaco-editor/min/vs/e...: 1267ms CPU time
Warning::
https://jsfiddle.net/: 904ms CPU time
Warning::
Unattributable: 274ms CPU time
Warning::
https://jsfiddle.net/cdn-cgi/challenge-platform/sc...: 264ms CPU time
Info::
https://jsfiddle.net/js/_dist-editor.js?a5d18b050a...: 60ms CPU time
Info::
Third-party scripts: 274ms (10% of total)

Main Thread Breakdown

Script Evaluation 56% Other 14% Style & Layout 12% Script Parsing & Compilation 11% Parse HTML & CSS 5%
ScriptTotalScriptingParse/CompileParty
https://jsfiddle.net/js/lib/monaco-editor/min/vs/editor/editor.main.js?a5d18b050a5a2ca908634e556824833385a8472d1267ms683ms330ms1st
https://jsfiddle.net/904ms472ms6ms1st
Unattributable274ms16ms0ms3rd
https://jsfiddle.net/cdn-cgi/challenge-platform/scripts/jsd/main.js264ms247ms3ms1st
https://jsfiddle.net/js/_dist-editor.js?a5d18b050a5a2ca908634e556824833385a8472d60ms8ms6ms1st
https://jsfiddle.net/js/lib/monaco-editor/min/vs/language/css/cssMode.js56ms52ms3ms1st
F
JS Bundles
Action
30 scripts, 616 KB unused
FIX
30 scripts, 616 KB unused
Warning::
https://jsfiddle.net/js/lib/monaco-editor/min/vs/e...: 616 KB unused (57%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 616 KB
616 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://jsfiddle.net/js/lib/monaco-editor/min/vs/editor/editor.main.js?a5d18b050a5a2ca908634e556824833385a8472d1080 KB616 KB (57%)✓1st
https://cdn.jsdelivr.net/npm/@popperjs/core@2.11.8/+esm8 KB—✓3rd
https://cdn.jsdelivr.net/npm/@popperjs/core@2.10.2/+esm8 KB—✓3rd
https://cdn.carbonads.com/carbon.js?serve=CW7DC2JY&placement=jsfiddlenet&format=cover10 KB—✓3rd
https://m.servedby-buysellads.com/monetization.js17 KB—✓3rd
https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da177152312451611 KB—✓3rd
https://unpkg.com/external-svg-loader@1.7.1/svg-loader.min.js4 KB—✓3rd
https://jsfiddle.net/js/lib/monaco-editor/min/vs/basic-languages/javascript/javascript.js3 KB—✓1st
https://jsfiddle.net/js/lib/monaco-editor/min/vs/language/typescript/tsMode.js8 KB—✓1st
https://cdn.jsdelivr.net/npm/emmet-monaco-es@5.5.0/+esm32 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

D
Page Weight Inventory
Action
48 resources · 3.4 MB · 616 KB savings available
FIX
48 resources · 3.4 MB · 616 KB savings available
Warning::
Page weight 2.4 MB over 1MB target
Got: 3.4 MB Expected: ≤ 1 MB
Info::
~616 KB of savings available
Info::
18 third-party resources (3% of weight)
Info::
2 resources over 200KB
48 resources · 3.4 MiB · 18 third-party 2.4 MiB over 1MB target
JavaScript 91% · 3.1 MiB
Font 5% · 188.2 KiB
CSS 2% · 69.6 KiB
Document 1% · 31.2 KiB
Image 0% · 11.0 KiB
Other 0% · 3.6 KiB

~616.5 KiB of savings available

Remove unused JavaScript: 616.5 KiB
B
HTTP Caching
max-age=0, private, must-revalidate
REVIEW
max-age=0, private, must-revalidate
Info::
Cache-Control header is set
Got: max-age=0, private, must-revalidate
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=0, private, must-revalidate

DirectiveValueMeaning
max-age0Cache for 0 seconds
private—Only browser cache, not CDN/proxy
must-revalidate—Must recheck with server after expiry
A+
Third-Party Impact
3% third-party, 0 ms blocking
PASS
3% third-party, 0 ms blocking
Info::
Third-party code accounts for 3% of page weight (108.8 KiB of 3.4 MiB)
Info::
Third-party blocking time is low (0 ms)
97%
First-party Third-party
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+
Image Optimization
1 images, 0 KB saveable
PASS
1 images, 0 KB saveable
Info::
All images are well-optimized
1 images 9 KB
0 oversized -0 KB
1 legacy format
0 missing dimensions CLS risk
A+
Font Loading
2 fonts (188 KB)
PASS
2 fonts (188 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

188 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 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 9.1 s LCP 10.1 shttps://jsfiddle.net/cf-fonts/v/inter/5.0.16/latin/wght/normal.woff2normal.woff2 https://jsfiddle.net/cf-fonts/v/inter/5.0.16/latin/wght/normal.woff2 — 47.6 KiB — 55 ms — font-display: swaphttps://jsfiddle.net/font/MonaspaceArgonVarVF[wght,wdth,slnt].woff2MonaspaceArgonVarVF[wgh... https://jsfiddle.net/font/MonaspaceArgonVarVF[wght,wdth,slnt].woff2 — 140.6 KiB — 54 ms — font-display: swap
normal.woff2 woff2 swap
Size 48 KB
Load time 55 ms
Start 580 ms
Risk FOUT — text flashes from fallback to web font
MonaspaceArgonVarVF[wgh... woff2 swap
Size 141 KB
Load time 54 ms
Start 813 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
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 ~70 KB and ~140 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
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Network Waterfall
48 requests over 2426ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 9.1 s LCP 10.1 shttps://jsfiddle.net// https://jsfiddle.net/ — 200 — 31.2 KiB — 192 ms — h2https://jsfiddle.net/cdn-cgi/speculation/cdn-cgi/speculation https://jsfiddle.net/cdn-cgi/speculation — 200 — 445 B — 21 ms — h2https://jsfiddle.net/css/dist-skeleton.css?a5d18b050a5a2ca908634e556824833385a8472d/css/dist-skeleton.css?a5d18b050a5a... https://jsfiddle.net/css/dist-skeleton.css?a5d18b050a5a2ca908634e556824833385a8472d — 200 — 4.1 KiB — 31 ms — h2https://jsfiddle.net/css/dist-editor.css?a5d18b050a5a2ca908634e556824833385a8472d/css/dist-editor.css?a5d18b050a5a2c... https://jsfiddle.net/css/dist-editor.css?a5d18b050a5a2ca908634e556824833385a8472d — 200 — 13.9 KiB — 33 ms — h2https://jsfiddle.net/js/_dist-editor.js?a5d18b050a5a2ca908634e556824833385a8472d/js/_dist-editor.js?a5d18b050a5a2ca... https://jsfiddle.net/js/_dist-editor.js?a5d18b050a5a2ca908634e556824833385a8472d — 200 — 23.4 KiB — 36 ms — h2https://jsfiddle.net/js/lib/monaco-editor/min/vs/editor/editor.main.css?a5d18b050a5a2ca908634e556824833385a8472d/js/lib/monaco-editor/min/vs/editor... https://jsfiddle.net/js/lib/monaco-editor/min/vs/editor/editor.main.css?a5d18b050a5a2ca908634e556824833385a8472d — 200 — 25.6 KiB — 47 ms — h2https://jsfiddle.net/js/lib/monaco-editor/min/vs/loader.js?a5d18b050a5a2ca908634e556824833385a8472d/js/lib/monaco-editor/min/vs/loader... https://jsfiddle.net/js/lib/monaco-editor/min/vs/loader.js?a5d18b050a5a2ca908634e556824833385a8472d — 200 — 10.4 KiB — 33 ms — h2https://jsfiddle.net/js/lib/monaco-editor/min/vs/editor/editor.main.js?a5d18b050a5a2ca908634e556824833385a8472d/js/lib/monaco-editor/min/vs/editor... https://jsfiddle.net/js/lib/monaco-editor/min/vs/editor/editor.main.js?a5d18b050a5a2ca908634e556824833385a8472d — 200 — 1.1 MiB — 114 ms — h2https://cdn.carbonads.com/carbon.js?serve=CW7DC2JY&placement=jsfiddlenet&format=covercdn.carbonads.com/carbon.js?serve=C... https://cdn.carbonads.com/carbon.js?serve=CW7DC2JY&placement=jsfiddlenet&format=cover — 200 — 10.1 KiB — 55 ms — h2https://m.servedby-buysellads.com/monetization.jsm.servedby-buysellads.com/monetizat... https://m.servedby-buysellads.com/monetization.js — 200 — 16.8 KiB — 56 ms — h2https://unpkg.com/external-svg-loader@latest/svg-loader.min.jsunpkg.com/external-svg-loader@lates... https://unpkg.com/external-svg-loader@latest/svg-loader.min.js — 302 — 310 B — 252 ms — h3https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da1771523124516static.cloudflareinsights.com/beaco... https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da1771523124516 — 200 — 10.7 KiB — 102 ms — h2https://jsfiddle.net/js/lib/monaco-editor/min/vs/editor/editor.main.css/js/lib/monaco-editor/min/vs/editor... https://jsfiddle.net/js/lib/monaco-editor/min/vs/editor/editor.main.css — 200 — 25.9 KiB — 62 ms — h3https://unpkg.com/external-svg-loader@1.7.1/svg-loader.min.jsunpkg.com/external-svg-loader@1.7.1... https://unpkg.com/external-svg-loader@1.7.1/svg-loader.min.js — 200 — 3.5 KiB — 38 ms — h3https://jsfiddle.net/cf-fonts/v/inter/5.0.16/latin/wght/normal.woff2/cf-fonts/v/inter/5.0.16/latin/wght... https://jsfiddle.net/cf-fonts/v/inter/5.0.16/latin/wght/normal.woff2 — 200 — 47.6 KiB — 55 ms — h3https://srv.buysellads.com/ads/CKYD52JI.json?segment=placement:jsfiddlenet-customsrv.buysellads.com/ads/CKYD52JI.jso... https://srv.buysellads.com/ads/CKYD52JI.json?segment=placement:jsfiddlenet-custom — 200 — 0 B — 196 ms — h2https://jsfiddle.net/cdn-cgi/challenge-platform/scripts/jsd/main.js/cdn-cgi/challenge-platform/scripts... https://jsfiddle.net/cdn-cgi/challenge-platform/scripts/jsd/main.js — 302 — 223 B — 172 ms — h3https://jsfiddle.net/js/lib/monaco-editor/min/vs/basic-languages/javascript/javascript.js/js/lib/monaco-editor/min/vs/basic-... https://jsfiddle.net/js/lib/monaco-editor/min/vs/basic-languages/javascript/javascript.js — 200 — 3.3 KiB — 35 ms — h3https://jsfiddle.net/js/lib/monaco-editor/min/vs/language/typescript/tsMode.js/js/lib/monaco-editor/min/vs/langua... https://jsfiddle.net/js/lib/monaco-editor/min/vs/language/typescript/tsMode.js — 200 — 8.0 KiB — 34 ms — h3https://cdn.jsdelivr.net/npm/emmet-monaco-es@5.5.0/+esmcdn.jsdelivr.net/npm/emmet-monaco-e... https://cdn.jsdelivr.net/npm/emmet-monaco-es@5.5.0/+esm — 200 — 32.4 KiB — 38 ms — h2https://jsfiddle.net/js/lib/monaco-editor/min/vs/basic-languages/html/html.js/js/lib/monaco-editor/min/vs/basic-... https://jsfiddle.net/js/lib/monaco-editor/min/vs/basic-languages/html/html.js — 200 — 2.4 KiB — 27 ms — h3https://jsfiddle.net/js/lib/monaco-editor/min/vs/language/html/htmlMode.js/js/lib/monaco-editor/min/vs/langua... https://jsfiddle.net/js/lib/monaco-editor/min/vs/language/html/htmlMode.js — 200 — 10.7 KiB — 27 ms — h3https://jsfiddle.net/js/lib/monaco-editor/min/vs/basic-languages/css/css.js/js/lib/monaco-editor/min/vs/basic-... https://jsfiddle.net/js/lib/monaco-editor/min/vs/basic-languages/css/css.js — 200 — 2.4 KiB — 30 ms — h3https://jsfiddle.net/js/lib/monaco-editor/min/vs/language/css/cssMode.js/js/lib/monaco-editor/min/vs/langua... https://jsfiddle.net/js/lib/monaco-editor/min/vs/language/css/cssMode.js — 200 — 10.5 KiB — 28 ms — h3https://cdn.jsdelivr.net/npm/@popperjs/core@2.11.8/+esmcdn.jsdelivr.net/npm/@popperjs/core... https://cdn.jsdelivr.net/npm/@popperjs/core@2.11.8/+esm — 200 — 7.9 KiB — 4 ms — h2https://jsfiddle.net/font/MonaspaceArgonVarVF[wght,wdth,slnt].woff2/font/MonaspaceArgonVarVF[wght,wdth... https://jsfiddle.net/font/MonaspaceArgonVarVF[wght,wdth,slnt].woff2 — 200 — 140.6 KiB — 54 ms — h3https://jsfiddle.net/cdn-cgi/challenge-platform/h/b/scripts/jsd/0b8fb825cb67/main.js?/cdn-cgi/challenge-platform/h/b/scr... https://jsfiddle.net/cdn-cgi/challenge-platform/h/b/scripts/jsd/0b8fb825cb67/main.js? — 200 — 13.3 KiB — 23 ms — h3https://jsfiddle.net/cdn-cgi/rum?/cdn-cgi/rum? https://jsfiddle.net/cdn-cgi/rum? — 204 — 469 B — 40 ms — h3https://srv.buysellads.com/ads/CKYD52JI.json?segment=placement:jsfiddlenet-customsrv.buysellads.com/ads/CKYD52JI.jso... https://srv.buysellads.com/ads/CKYD52JI.json?segment=placement:jsfiddlenet-custom — 200 — 627 B — 41 ms — h2blob:https://jsfiddle.net/1a179645-3ffd-4379-89b1-0984fe6c5fa5jsfiddle.net/1a179645-3ffd-4379-89b... blob:https://jsfiddle.net/1a179645-3ffd-4379-89b1-0984fe6c5fa5 — 200 — -1 B — 132 ms — blob
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 9.1 s LCP 10.1 shttps://jsfiddle.net// https://jsfiddle.net/ — 200 — 31.2 KiB — 192 ms — h2https://jsfiddle.net/cdn-cgi/speculation/cdn-cgi/speculation https://jsfiddle.net/cdn-cgi/speculation — 200 — 445 B — 21 ms — h2https://jsfiddle.net/css/dist-skeleton.css?a5d18b050a5a2ca908634e556824833385a8472d/css/dist-skeleton.css?a5d18b050a5a... https://jsfiddle.net/css/dist-skeleton.css?a5d18b050a5a2ca908634e556824833385a8472d — 200 — 4.1 KiB — 31 ms — h2https://jsfiddle.net/css/dist-editor.css?a5d18b050a5a2ca908634e556824833385a8472d/css/dist-editor.css?a5d18b050a5a2c... https://jsfiddle.net/css/dist-editor.css?a5d18b050a5a2ca908634e556824833385a8472d — 200 — 13.9 KiB — 33 ms — h2https://jsfiddle.net/js/_dist-editor.js?a5d18b050a5a2ca908634e556824833385a8472d/js/_dist-editor.js?a5d18b050a5a2ca... https://jsfiddle.net/js/_dist-editor.js?a5d18b050a5a2ca908634e556824833385a8472d — 200 — 23.4 KiB — 36 ms — h2https://jsfiddle.net/js/lib/monaco-editor/min/vs/editor/editor.main.css?a5d18b050a5a2ca908634e556824833385a8472d/js/lib/monaco-editor/min/vs/editor... https://jsfiddle.net/js/lib/monaco-editor/min/vs/editor/editor.main.css?a5d18b050a5a2ca908634e556824833385a8472d — 200 — 25.6 KiB — 47 ms — h2https://jsfiddle.net/js/lib/monaco-editor/min/vs/loader.js?a5d18b050a5a2ca908634e556824833385a8472d/js/lib/monaco-editor/min/vs/loader... https://jsfiddle.net/js/lib/monaco-editor/min/vs/loader.js?a5d18b050a5a2ca908634e556824833385a8472d — 200 — 10.4 KiB — 33 ms — h2https://jsfiddle.net/js/lib/monaco-editor/min/vs/editor/editor.main.js?a5d18b050a5a2ca908634e556824833385a8472d/js/lib/monaco-editor/min/vs/editor... https://jsfiddle.net/js/lib/monaco-editor/min/vs/editor/editor.main.js?a5d18b050a5a2ca908634e556824833385a8472d — 200 — 1.1 MiB — 114 ms — h2https://cdn.carbonads.com/carbon.js?serve=CW7DC2JY&placement=jsfiddlenet&format=covercdn.carbonads.com/carbon.js?serve=C... https://cdn.carbonads.com/carbon.js?serve=CW7DC2JY&placement=jsfiddlenet&format=cover — 200 — 10.1 KiB — 55 ms — h2https://m.servedby-buysellads.com/monetization.jsm.servedby-buysellads.com/monetizat... https://m.servedby-buysellads.com/monetization.js — 200 — 16.8 KiB — 56 ms — h2https://unpkg.com/external-svg-loader@latest/svg-loader.min.jsunpkg.com/external-svg-loader@lates... https://unpkg.com/external-svg-loader@latest/svg-loader.min.js — 302 — 310 B — 252 ms — h3https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da1771523124516static.cloudflareinsights.com/beaco... https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da1771523124516 — 200 — 10.7 KiB — 102 ms — h2https://jsfiddle.net/js/lib/monaco-editor/min/vs/editor/editor.main.css/js/lib/monaco-editor/min/vs/editor... https://jsfiddle.net/js/lib/monaco-editor/min/vs/editor/editor.main.css — 200 — 25.9 KiB — 62 ms — h3https://unpkg.com/external-svg-loader@1.7.1/svg-loader.min.jsunpkg.com/external-svg-loader@1.7.1... https://unpkg.com/external-svg-loader@1.7.1/svg-loader.min.js — 200 — 3.5 KiB — 38 ms — h3https://jsfiddle.net/cf-fonts/v/inter/5.0.16/latin/wght/normal.woff2/cf-fonts/v/inter/5.0.16/latin/wght... https://jsfiddle.net/cf-fonts/v/inter/5.0.16/latin/wght/normal.woff2 — 200 — 47.6 KiB — 55 ms — h3https://srv.buysellads.com/ads/CKYD52JI.json?segment=placement:jsfiddlenet-customsrv.buysellads.com/ads/CKYD52JI.jso... https://srv.buysellads.com/ads/CKYD52JI.json?segment=placement:jsfiddlenet-custom — 200 — 0 B — 196 ms — h2https://jsfiddle.net/cdn-cgi/challenge-platform/scripts/jsd/main.js/cdn-cgi/challenge-platform/scripts... https://jsfiddle.net/cdn-cgi/challenge-platform/scripts/jsd/main.js — 302 — 223 B — 172 ms — h3https://jsfiddle.net/js/lib/monaco-editor/min/vs/basic-languages/javascript/javascript.js/js/lib/monaco-editor/min/vs/basic-... 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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
10% of JavaScript execution is third-party
First-party Third-party 274ms · 0KB · $4/mo
Unattributable
Other
Costly
Execution 274ms
Transfer 0 KB
Monthly Cost $4/mo

These scripts may cost more than they're worth

  • Unattributable adds 274ms and costs ~$4/month

Unattributable takes 274ms 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

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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