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https://youtube.com

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
79
GRADE
C
FIX
3
REVIEW
2
PASS
10
INFO
2

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

Mobile Desktop
43
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
83
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.

6.04 s

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

8.10 s

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

718 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.001

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

6.04 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.

11.16 s

Page Load Progression

375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 s
Checks
17
10 PASS 2 REVIEW 3 FIX
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 (1.3 MiB of 1.3 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
2979ms total JS execution
FIX
2979ms total JS execution
Warning::
https://m.youtube.com/s/_/ytmweb/_/js/k=ytmweb.c3_...: 1193ms CPU time
Warning::
Unattributable: 650ms CPU time
Warning::
https://m.youtube.com/: 446ms CPU time
Info::
https://m.youtube.com/s/_/ytmweb/_/js/k=ytmweb.c3_...: 230ms CPU time
Info::
https://m.youtube.com/s/player/b174a5bb/player-pla...: 167ms CPU time
Warning::
Third-party scripts: 2979ms (100% of total)

Main Thread Breakdown

Script Evaluation 63% Other 18% Script Parsing & Compilation 8% Style & Layout 4%
ScriptTotalScriptingParse/CompileParty
https://m.youtube.com/s/_/ytmweb/_/js/k=ytmweb.c3_base.en_US.4A446WuLG4I.2021.O/am=AAAAAAM/d=1/br=1/rs=ABnK5FJZV4rEcCtr4X3NAxTDzqJY2WgMxw/m=root,c3_base,zcskIc,SFvGjc,cDTHu,JoU6vf,Di4hBc,dpUCFd,Nuilue1193ms918ms120ms3rd
Unattributable650ms123ms0ms3rd
https://m.youtube.com/446ms139ms42ms3rd
https://m.youtube.com/s/_/ytmweb/_/js/k=ytmweb.c3_base.en_US.4A446WuLG4I.2021.O/am=AAAAAAM/d=1/exm=Di4hBc,ERsVff,JoU6vf,Nuilue,R3u7e,Rv3e3d,SFvGjc,c3_base,cDTHu,dpUCFd,hBod9c,root,zcskIc/ed=1/br=1/rs=ABnK5FJZV4rEcCtr4X3NAxTDzqJY2WgMxw/m=qiuJmb,hjrNn,tkEWoe,Cj1YCb,jVxNAb230ms189ms1ms3rd
https://m.youtube.com/s/player/b174a5bb/player-plasma-es6-en_US.vflset/base.js167ms56ms108ms3rd
https://m.youtube.com/static/r/072389cc/scheduler.vflset/scheduler.js106ms73ms1ms3rd
https://www.google.com/js/th/cdHZnmAh7yL5wO3Dlc3wxOFdaDuUvCTre1L4S51GVXg.js104ms93ms5ms3rd
https://m.youtube.com/s/_/ytmweb/_/js/k=ytmweb.c3_base.en_US.4A446WuLG4I.2021.O/am=AAAAAAM/d=1/exm=Di4hBc,JoU6vf,Nuilue,SFvGjc,c3_base,cDTHu,dpUCFd,root,zcskIc/ed=1/br=1/rs=ABnK5FJZV4rEcCtr4X3NAxTDzqJY2WgMxw/m=Rv3e3d81ms73ms7ms3rd
F
JS Bundles
Action
12 scripts, 598 KB unused
FIX
12 scripts, 598 KB unused
Warning::
https://m.youtube.com/s/player/b174a5bb/player-pla...: 308 KB unused (74%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://m.youtube.com/s/_/ytmweb/_/js/k=ytmweb.c3_...: 231 KB unused (53%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://m.youtube.com/s/_/ytmweb/_/js/k=ytmweb.c3_...: 59 KB unused (77%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 598 KB
598 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://m.youtube.com/s/player/b174a5bb/player-plasma-es6-en_US.vflset/base.js417 KB308 KB (74%)✓3rd
https://m.youtube.com/s/_/ytmweb/_/js/k=ytmweb.c3_base.en_US.4A446WuLG4I.2021.O/am=AAAAAAM/d=1/br=1/rs=ABnK5FJZV4rEcCtr4X3NAxTDzqJY2WgMxw/m=root,c3_base,zcskIc,SFvGjc,cDTHu,JoU6vf,Di4hBc,dpUCFd,Nuilue435 KB231 KB (53%)✓3rd
https://m.youtube.com/s/_/ytmweb/_/js/k=ytmweb.c3_base.en_US.4A446WuLG4I.2021.O/am=AAAAAAM/d=1/exm=Di4hBc,JoU6vf,Nuilue,Rv3e3d,SFvGjc,c3_base,cDTHu,dpUCFd,hBod9c,root,zcskIc/ed=1/br=1/rs=ABnK5FJZV4rEcCtr4X3NAxTDzqJY2WgMxw/m=ERsVff77 KB59 KB (77%)✓3rd
https://m.youtube.com/static/r/072389cc/scheduler.vflset/scheduler.js3 KB—✓3rd
https://m.youtube.com/static/r/072389cc/fetch_polyfill.vflset/fetch_polyfill.js3 KB—✓3rd
https://m.youtube.com/s/_/ytmweb/_/js/k=ytmweb.c3_base.en_US.4A446WuLG4I.2021.O/am=AAAAAAM/d=1/exm=Di4hBc,JoU6vf,Nuilue,SFvGjc,c3_base,cDTHu,dpUCFd,root,zcskIc/ed=1/br=1/rs=ABnK5FJZV4rEcCtr4X3NAxTDzqJY2WgMxw/m=Rv3e3d17 KB—✓3rd
https://www.google.com/js/th/cdHZnmAh7yL5wO3Dlc3wxOFdaDuUvCTre1L4S51GVXg.js23 KB—✓3rd
https://m.youtube.com/s/_/ytmweb/_/js/k=ytmweb.c3_base.en_US.4A446WuLG4I.2021.O/am=AAAAAAM/d=1/exm=Di4hBc,JoU6vf,Nuilue,Rv3e3d,SFvGjc,c3_base,cDTHu,dpUCFd,root,zcskIc/ed=1/br=1/rs=ABnK5FJZV4rEcCtr4X3NAxTDzqJY2WgMxw/m=hBod9c0 KB—✓3rd
https://m.youtube.com/s/_/ytmweb/_/js/k=ytmweb.c3_base.en_US.4A446WuLG4I.2021.O/am=AAAAAAM/d=1/exm=Di4hBc,ERsVff,JoU6vf,Nuilue,Rv3e3d,SFvGjc,c3_base,cDTHu,dpUCFd,hBod9c,root,zcskIc/ed=1/br=1/rs=ABnK5FJZV4rEcCtr4X3NAxTDzqJY2WgMxw/m=R3u7e1 KB—✓3rd
https://m.youtube.com/s/_/ytmweb/_/js/k=ytmweb.c3_base.en_US.4A446WuLG4I.2021.O/am=AAAAAAM/d=1/exm=Di4hBc,ERsVff,JoU6vf,Nuilue,R3u7e,Rv3e3d,SFvGjc,c3_base,cDTHu,dpUCFd,hBod9c,root,zcskIc/ed=1/br=1/rs=ABnK5FJZV4rEcCtr4X3NAxTDzqJY2WgMxw/m=qiuJmb,hjrNn,tkEWoe,Cj1YCb,jVxNAb2 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

B
Page Weight Budget
1.3 MB transferred, 79 requests
REVIEW
1.3 MB transferred, 79 requests
Info::
Page weighs 5.2 MB (1.3 MB transferred)
Warning::
JavaScript is 980 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 980 KB
Info::
79 HTTP requests
Info::
Estimated 0.27 g CO2 per page load
1.3 MB / 2.4 MB budget
1.3 MB transferred
79 requests
0.27 g CO2 per page load
JavaScript 980.3 KiB 75%
CSS 176.7 KiB 14%
HTML 65.2 KiB 5%
Fonts 28.1 KiB 2%
Other 26.3 KiB 2%
Other 18.5 KiB 1%
Other 5.6 KiB 0%
Images 1.2 KiB 0%
Other 195 B 0%
0 2.4 MB 4.9 MB
Under 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

C
Page Weight Inventory
Action
79 resources · 1.3 MB · 598 KB savings available
REVIEW
79 resources · 1.3 MB · 598 KB savings available
Warning::
Page weight 278 KB over 1MB target
Got: 1.3 MB Expected: ≤ 1 MB
Info::
~598 KB of savings available
Warning::
78 third-party resources (100% of weight)
Info::
2 resources over 200KB
79 resources · 1.3 MiB · 78 third-party 278.0 KiB over 1MB target
JavaScript 75% · 980.3 KiB
CSS 14% · 176.7 KiB
Document 5% · 66.4 KiB
Font 2% · 28.1 KiB
Media 2% · 26.3 KiB
Image 1% · 15.4 KiB
Other 1% · 8.9 KiB

~598.4 KiB of savings available

Remove unused JavaScript: 598.4 KiB
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
3 images, 0 KB saveable
PASS
3 images, 0 KB saveable
Info::
All images are well-optimized
3 images 1 KB
0 oversized -0 KB
2 legacy format
0 missing dimensions CLS risk
A+
Font Loading
2 fonts (28 KB)
PASS
2 fonts (28 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

28 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 6.0 s 7.0 s 8.0 s FCP 6.0 s LCP 8.1 shttps://fonts.gstatic.com/s/roboto/v18/KFOmCnqEu92Fr1Mu4mxPKTU1Kg.ttfKFOmCnqEu92Fr1Mu4mxPKTU... https://fonts.gstatic.com/s/roboto/v18/KFOmCnqEu92Fr1Mu4mxPKTU1Kg.ttf — 14.0 KiB — 125 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v18/KFOlCnqEu92Fr1MmEU9fBBc9AMP6lQ.ttfKFOlCnqEu92Fr1MmEU9fBBc... https://fonts.gstatic.com/s/roboto/v18/KFOlCnqEu92Fr1MmEU9fBBc9AMP6lQ.ttf — 14.1 KiB — 121 ms — font-display: swap
KFOmCnqEu92Fr1Mu4mxPKTU... ttf swap
Size 14 KB
Load time 125 ms
Start 549 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
KFOlCnqEu92Fr1MmEU9fBBc... ttf swap
Size 14 KB
Load time 121 ms
Start 558 ms
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 ~8 KB and ~16 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: Google Cloud

A
HTTP Caching
max-age=31536000 (52 weeks)
PASS
max-age=31536000 (52 weeks)
Info::
Cache-Control header is set
Got: private, max-age=31536000
Info::
Effective TTL: 52 weeks (max-age=31536000)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

private, max-age=31536000

DirectiveValueMeaning
private—Only browser cache, not CDN/proxy
max-age31536000Cache for 52 weeks
Effective TTL: 31536000 seconds
Network Waterfall
79 requests over 3627ms
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 6.0 s LCP 8.1 shttps://youtube.com// https://youtube.com/ — 302 — 2.6 KiB — 93 ms — h2https://m.youtube.com/m.youtube.com/ https://m.youtube.com/ — 200 — 62.4 KiB — 222 ms — h3https://m.youtube.com/static/r/072389cc/scheduler.vflset/scheduler.jsm.youtube.com/static/r/072389cc/sch... https://m.youtube.com/static/r/072389cc/scheduler.vflset/scheduler.js — 200 — 3.1 KiB — 113 ms — h3https://m.youtube.com/static/r/072389cc/fetch_polyfill.vflset/fetch_polyfill.jsm.youtube.com/static/r/072389cc/fet... https://m.youtube.com/static/r/072389cc/fetch_polyfill.vflset/fetch_polyfill.js — 200 — 2.6 KiB — 112 ms — h3https://m.youtube.com/s/_/ytmweb/_/js/k=ytmweb.c3_base.en_US.4A446WuLG4I.2021.O/am=AAAAAAM/d=1/br=1/rs=ABnK5FJZV4rEcCtr4X3NAxTDzqJY2WgMxw/m=root,c3_base,zcskIc,SFvGjc,cDTHu,JoU6vf,Di4hBc,dpUCFd,Nuiluem.youtube.com/s/_/ytmweb/_/js/k=ytm... https://m.youtube.com/s/_/ytmweb/_/js/k=ytmweb.c3_base.en_US.4A446WuLG4I.2021.O/am=AAAAAAM/d=1/br=1/rs=ABnK5FJZV4rEcCtr4X3NAxTDzqJY2WgMxw/m=root,c3_base,zcskIc,SFvGjc,cDTHu,JoU6vf,Di4hBc,dpUCFd,Nuilue — 200 — 434.9 KiB — 180 ms — h3https://m.youtube.com/s/_/ytmweb/_/ss/k=ytmweb.c3_base.Nl539GGld64.L.W.O/am=AAAAAAMCBAw/d=0/br=1/rs=ABnK5FIgWF7vcKhr0B04SD8eock7B6AqTAm.youtube.com/s/_/ytmweb/_/ss/k=ytm... https://m.youtube.com/s/_/ytmweb/_/ss/k=ytmweb.c3_base.Nl539GGld64.L.W.O/am=AAAAAAMCBAw/d=0/br=1/rs=ABnK5FIgWF7vcKhr0B04SD8eock7B6AqTA — 200 — 116.6 KiB — 106 ms — h3data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAeAAAAFoCAYAAACPNyggAAAOn0lEQVR4Xu3VsQnDQBBFwd3AakTuv…data:image/png;base64,iVBORw0KGgoAA... data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAeAAAAFoCAYAAACPNyggAAAOn0lEQVR4Xu3VsQnDQBBFwd3AakTuv… — 200 — 0 B — 0 ms — datahttps://fonts.gstatic.com/s/roboto/v18/KFOmCnqEu92Fr1Mu4mxPKTU1Kg.ttffonts.gstatic.com/s/roboto/v18/KFOm... https://fonts.gstatic.com/s/roboto/v18/KFOmCnqEu92Fr1Mu4mxPKTU1Kg.ttf — 200 — 14.0 KiB — 125 ms — h3https://fonts.gstatic.com/s/roboto/v18/KFOlCnqEu92Fr1MmEU9fBBc9AMP6lQ.ttffonts.gstatic.com/s/roboto/v18/KFOl... https://fonts.gstatic.com/s/roboto/v18/KFOlCnqEu92Fr1MmEU9fBBc9AMP6lQ.ttf — 200 — 14.1 KiB — 121 ms — h3https://m.youtube.com/s/_/ytmweb/_/js/k=ytmweb.c3_base.en_US.4A446WuLG4I.2021.O/am=AAAAAAM/d=1/exm=Di4hBc,JoU6vf,Nuilue,SFvGjc,c3_base,cDTHu,dpUCFd,root,zcskIc/ed=1/br=1/rs=ABnK5FJZV4rEcCtr4X3NAxTDzqJY2WgMxw/m=Rv3e3dm.youtube.com/s/_/ytmweb/_/js/k=ytm... https://m.youtube.com/s/_/ytmweb/_/js/k=ytmweb.c3_base.en_US.4A446WuLG4I.2021.O/am=AAAAAAM/d=1/exm=Di4hBc,JoU6vf,Nuilue,SFvGjc,c3_base,cDTHu,dpUCFd,root,zcskIc/ed=1/br=1/rs=ABnK5FJZV4rEcCtr4X3NAxTDzqJY2WgMxw/m=Rv3e3d — 200 — 16.9 KiB — 37 ms — h3https://accounts.google.com/ServiceLogin?ltmpl=mobile&service=youtube&uilel=3&passive=true&continue=https%3A%2F%2Fm.youtube.com%2Fsignin%3Faction_handle_signin%3Dtrue%26app%3Dm%26hl%3Den%26next%3D%252Fsignin_passive%26feature%3Dmobile_passive%26noapp%3D1&hl=enaccounts.google.com/ServiceLogin?lt... https://accounts.google.com/ServiceLogin?ltmpl=mobile&service=youtube&uilel=3&passive=true&continue=https%3A%2F%2Fm.youtube.com%2Fsignin%3Faction_handle_signin%3Dtrue%26app%3Dm%26hl%3Den%26next%3D%252Fsignin_passive%26feature%3Dmobile_passive%26noapp%3D1&hl=en — 302 — 1.3 KiB — 103 ms — h2https://www.google.com/js/th/cdHZnmAh7yL5wO3Dlc3wxOFdaDuUvCTre1L4S51GVXg.jswww.google.com/js/th/cdHZnmAh7yL5wO... https://www.google.com/js/th/cdHZnmAh7yL5wO3Dlc3wxOFdaDuUvCTre1L4S51GVXg.js — 200 — 23.1 KiB — 65 ms — h3https://m.youtube.com/youtubei/v1/guide?prettyPrint=falsem.youtube.com/youtubei/v1/guide?pre... https://m.youtube.com/youtubei/v1/guide?prettyPrint=false — 200 — 4.5 KiB — 61 ms — h3https://accounts.google.com/InteractiveLogin?continue=https://m.youtube.com/signin?action_handle_signin%3Dtrue%26app%3Dm%26hl%3Den%26next%3D%252Fsignin_passive%26feature%3Dmobile_passive%26noapp%3D1&hl=en&ltmpl=mobile&passive=true&service=youtube&uilel=3&dsh=S1931172591:1776358517527004accounts.google.com/InteractiveLogi... https://accounts.google.com/InteractiveLogin?continue=https://m.youtube.com/signin?action_handle_signin%3Dtrue%26app%3Dm%26hl%3Den%26next%3D%252Fsignin_passive%26feature%3Dmobile_passive%26noapp%3D1&hl=en&ltmpl=mobile&passive=true&service=youtube&uilel=3&dsh=S1931172591:1776358517527004 — 302 — 870 B — 52 ms — h2https://m.youtube.com/s/_/ytmweb/_/js/k=ytmweb.c3_base.en_US.4A446WuLG4I.2021.O/am=AAAAAAM/d=1/exm=Di4hBc,JoU6vf,Nuilue,Rv3e3d,SFvGjc,c3_base,cDTHu,dpUCFd,root,zcskIc/ed=1/br=1/rs=ABnK5FJZV4rEcCtr4X3NAxTDzqJY2WgMxw/m=hBod9cm.youtube.com/s/_/ytmweb/_/js/k=ytm... 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h3https://fonts.gstatic.com/s/i/youtube_outline_experimental/alert_bubble/v2/24px.svgfonts.gstatic.com/s/i/youtube_outli... https://fonts.gstatic.com/s/i/youtube_outline_experimental/alert_bubble/v2/24px.svg — 200 — 302 B — 37 ms — h3https://fonts.gstatic.com/s/i/youtube_outline_experimental/arrow_left/v8/24px.svgfonts.gstatic.com/s/i/youtube_outli... https://fonts.gstatic.com/s/i/youtube_outline_experimental/arrow_left/v8/24px.svg — 200 — 219 B — 37 ms — h3https://fonts.gstatic.com/s/i/youtube_outline_experimental/arrow_up_right/v2/24px.svgfonts.gstatic.com/s/i/youtube_outli... https://fonts.gstatic.com/s/i/youtube_outline_experimental/arrow_up_right/v2/24px.svg — 200 — 208 B — 40 ms — h3https://m.youtube.com/s/_/ytmweb/_/js/k=ytmweb.c3_base.en_US.4A446WuLG4I.2021.O/am=AAAAAAM/d=1/exm=Di4hBc,JoU6vf,Nuilue,Rv3e3d,SFvGjc,c3_base,cDTHu,dpUCFd,hBod9c,root,zcskIc/ed=1/br=1/rs=ABnK5FJZV4rEcCtr4X3NAxTDzqJY2WgMxw/m=ERsVffm.youtube.com/s/_/ytmweb/_/js/k=ytm... 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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 2979ms · 960KB · €32/mo
m.youtube.com
Other
Costly
Execution 1193ms
Transfer 435 KB
Unused 53%
Monthly Cost €13/mo
Unattributable
Other
Costly
Execution 650ms
Transfer 0 KB
Monthly Cost €7/mo
m.youtube.com
Other
Costly
Execution 446ms
Transfer 62 KB
Monthly Cost €5/mo
m.youtube.com
Other
Costly
Execution 230ms
Transfer 2 KB
Monthly Cost €2/mo
m.youtube.com
Other
Optional
Execution 167ms
Transfer 417 KB
Unused 74%
Monthly Cost €2/mo
m.youtube.com
Other
Optional
Execution 106ms
Transfer 3 KB
Monthly Cost €1/mo
www.google.com
Other
Optional
Execution 104ms
Transfer 23 KB
Monthly Cost €1/mo
m.youtube.com
Other
Optional
Execution 81ms
Transfer 17 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • m.youtube.com adds 1193ms and costs ~€13/month
  • Unattributable adds 650ms and costs ~€7/month
  • m.youtube.com adds 446ms and costs ~€5/month
  • m.youtube.com adds 230ms and costs ~€2/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

m.youtube.com takes 1193ms 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

53% of m.youtube.com'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

Unattributable takes 650ms 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

m.youtube.com takes 446ms 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

m.youtube.com takes 230ms 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

74% of m.youtube.com'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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