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https://youtube.com

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
79
GRADE
C
FIX
5
REVIEW
0
PASS
8
INFO
2

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

Mobile Desktop
50
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
97
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.
92
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.

1.12 s

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

3.56 s

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

488 ms

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

0.027

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

2.98 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.

5.22 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
15
8 PASS 5 FIX
F
Page Weight Budget
Action
3.5 MB transferred, 150 requests
FIX
3.5 MB transferred, 150 requests
Warning::
Page weighs 16.7 MB (3.5 MB transferred)
Warning::
JavaScript is 2.6 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 2.6 MB
Info::
CSS is 349 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 349 KB
Warning::
150 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.73 g CO2 per page load
3.5 MB / 2.4 MB budget
3.5 MB transferred
150 requests
0.73 g CO2 per page load
JavaScript 2.6 MiB 73%
Other 387.2 KiB 11%
CSS 349.0 KiB 10%
HTML 79.6 KiB 2%
Fonts 68.1 KiB 2%
Other 38.4 KiB 1%
Other 25.8 KiB 1%
Other 1.9 KiB 0%
Other 193 B 0%
Images 12 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

Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.

Why this matters

CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.

Source: web.dev

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

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 (3.5 MiB of 3.5 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
2392ms total JS execution
FIX
2392ms total JS execution
Warning::
https://www.youtube.com/s/_/ytmainappweb/_/js/k=yt...: 1112ms CPU time
Warning::
https://www.youtube.com/s/desktop/4329498d/jsbin/w...: 571ms CPU time
Warning::
Unattributable: 414ms CPU time
Info::
https://www.youtube.com/s/player/b174a5bb/player_e...: 164ms CPU time
Info::
https://www.youtube.com/: 131ms CPU time
Warning::
Third-party scripts: 2392ms (100% of total)

Main Thread Breakdown

Script Evaluation 65% Other 16% Script Parsing & Compilation 9% Parse HTML & CSS 4% Style & Layout 3%
ScriptTotalScriptingParse/CompileParty
https://www.youtube.com/s/_/ytmainappweb/_/js/k=ytmainappweb.kevlar_base.en_US.IFuzsR39iKY.es5.O/am=AAAAQAAAoAE/d=1/br=1/rs=AGKMywEoaqUxZgRRIyE-HwamtYXw-7Eqzg/m=kevlar_base_module,kevlar_main_module1112ms821ms166ms3rd
https://www.youtube.com/s/desktop/4329498d/jsbin/web-animations-next-lite.min.vflset/web-animations-next-lite.min.js571ms391ms1ms3rd
Unattributable414ms141ms0ms3rd
https://www.youtube.com/s/player/b174a5bb/player_es6.vflset/en_US/base.js164ms113ms46ms3rd
https://www.youtube.com/131ms13ms21ms3rd
F
JS Bundles
Action
18 scripts, 1.6 MB unused
FIX
18 scripts, 1.6 MB unused
Warning::
https://www.youtube.com/s/_/ytmainappweb/_/js/k=yt...: 1.1 MB unused (61%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.youtube.com/s/player/b174a5bb/player_e...: 467 KB unused (73%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.youtube.com/s/player/b174a5bb/player_e...: 27 KB unused (78%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 1.6 MB
1606 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.youtube.com/s/_/ytmainappweb/_/js/k=ytmainappweb.kevlar_base.en_US.IFuzsR39iKY.es5.O/am=AAAAQAAAoAE/d=1/br=1/rs=AGKMywEoaqUxZgRRIyE-HwamtYXw-7Eqzg/m=kevlar_base_module,kevlar_main_module1834 KB1113 KB (61%)✓3rd
https://www.youtube.com/s/player/b174a5bb/player_es6.vflset/en_US/base.js639 KB467 KB (73%)✓3rd
https://www.youtube.com/s/player/b174a5bb/player_es6.vflset/en_US/remote.js34 KB27 KB (78%)✓3rd
https://www.youtube.com/s/desktop/4329498d/jsbin/network.vflset/network.js5 KB—✓3rd
https://www.youtube.com/s/desktop/4329498d/jsbin/custom-elements-es5-adapter.vflset/custom-elements-es5-adapter.js1 KB—✓3rd
https://www.youtube.com/s/desktop/4329498d/jsbin/scheduler.vflset/scheduler.js3 KB—✓3rd
https://www.youtube.com/s/desktop/4329498d/jsbin/www-i18n-constants-en_US.vflset/www-i18n-constants.js2 KB—✓3rd
https://www.youtube.com/s/desktop/4329498d/jsbin/spf.vflset/spf.js12 KB—✓3rd
https://www.youtube.com/s/desktop/4329498d/jsbin/webcomponents-sd.vflset/webcomponents-sd.js21 KB—✓3rd
https://www.google.com/js/th/cdHZnmAh7yL5wO3Dlc3wxOFdaDuUvCTre1L4S51GVXg.js23 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

F
Page Weight Inventory
Action
150 resources · 3.5 MB · 1.6 MB savings available
FIX
150 resources · 3.5 MB · 1.6 MB savings available
Warning::
Page weight 2.5 MB over 1MB target
Got: 3.5 MB Expected: ≤ 1 MB
Info::
~1.6 MB of savings available
Warning::
148 third-party resources (100% of weight)
Info::
4 resources over 200KB
150 resources · 3.5 MiB · 148 third-party 2.5 MiB over 1MB target
JavaScript 73% · 2.6 MiB
Other 11% · 386.7 KiB
CSS 10% · 349.0 KiB
Document 2% · 80.4 KiB
Font 2% · 68.1 KiB
Image 1% · 40.2 KiB
Media 1% · 25.8 KiB

~1.6 MiB of savings available

Remove unused JavaScript: 1.6 MiB
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 0 KB
0 oversized -0 KB
1 legacy format
0 missing dimensions CLS risk
A+
Font Loading
2 fonts (68 KB)
PASS
2 fonts (68 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

68 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 FCP 1.1 s LCP 3.6 shttps://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 36.7 KiB — 64 ms — font-display: swaphttps://fonts.gstatic.com/s/youtubesans/v32/Qw38ZQNGEDjaO2m6tqIqX5E-AVS5_rSejo46_PCTRspJ0OosolrBEJL3HO_T7fHoCVHx.woff2Qw38ZQNGEDjaO2m6tqIqX5E... https://fonts.gstatic.com/s/youtubesans/v32/Qw38ZQNGEDjaO2m6tqIqX5E-AVS5_rSejo46_PCTRspJ0OosolrBEJL3HO_T7fHoCVHx.woff2 — 31.5 KiB — 43 ms — font-display: swap
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 37 KB
Load time 64 ms
Start 601 ms
Risk FOUT — text flashes from fallback to web font
Qw38ZQNGEDjaO2m6tqIqX5E... woff2 swap
Size 31 KB
Load time 43 ms
Start 2.0 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
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
150 requests over 3400ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 1.1 s LCP 3.6 shttps://youtube.com// https://youtube.com/ — 301 — 2.1 KiB — 83 ms — h2https://www.youtube.com/www.youtube.com/ https://www.youtube.com/ — 200 — 76.8 KiB — 341 ms — h2https://i.ytimg.com/generate_204i.ytimg.com/generate_204 https://i.ytimg.com/generate_204 — 204 — 118 B — 142 ms — h2https://www.youtube.com/s/_/ytmainappweb/_/js/k=ytmainappweb.kevlar_base.en_US.IFuzsR39iKY.es5.O/am=AAAAQAAAoAE/d=1/br=1/rs=AGKMywEoaqUxZgRRIyE-HwamtYXw-7Eqzg/m=kevlar_base_module,kevlar_main_modulewww.youtube.com/s/_/ytmainappweb/_/... https://www.youtube.com/s/_/ytmainappweb/_/js/k=ytmainappweb.kevlar_base.en_US.IFuzsR39iKY.es5.O/am=AAAAQAAAoAE/d=1/br=1/rs=AGKMywEoaqUxZgRRIyE-HwamtYXw-7Eqzg/m=kevlar_base_module,kevlar_main_module — 200 — 1.8 MiB — 261 ms — h2https://www.youtube.com/s/desktop/4329498d/jsbin/web-animations-next-lite.min.vflset/web-animations-next-lite.min.jswww.youtube.com/s/desktop/4329498d/... https://www.youtube.com/s/desktop/4329498d/jsbin/web-animations-next-lite.min.vflset/web-animations-next-lite.min.js — 200 — 14.1 KiB — 46 ms — h2https://www.youtube.com/s/desktop/4329498d/jsbin/custom-elements-es5-adapter.vflset/custom-elements-es5-adapter.jswww.youtube.com/s/desktop/4329498d/... https://www.youtube.com/s/desktop/4329498d/jsbin/custom-elements-es5-adapter.vflset/custom-elements-es5-adapter.js — 200 — 781 B — 47 ms — h2https://www.youtube.com/s/desktop/4329498d/jsbin/webcomponents-sd.vflset/webcomponents-sd.jswww.youtube.com/s/desktop/4329498d/... https://www.youtube.com/s/desktop/4329498d/jsbin/webcomponents-sd.vflset/webcomponents-sd.js — 200 — 21.0 KiB — 59 ms — h2https://www.youtube.com/s/desktop/4329498d/jsbin/intersection-observer.min.vflset/intersection-observer.min.jswww.youtube.com/s/desktop/4329498d/... https://www.youtube.com/s/desktop/4329498d/jsbin/intersection-observer.min.vflset/intersection-observer.min.js — 200 — 2.0 KiB — 56 ms — h2https://www.youtube.com/s/desktop/4329498d/jsbin/scheduler.vflset/scheduler.jswww.youtube.com/s/desktop/4329498d/... https://www.youtube.com/s/desktop/4329498d/jsbin/scheduler.vflset/scheduler.js — 200 — 3.1 KiB — 150 ms — h2https://www.youtube.com/s/desktop/4329498d/jsbin/www-i18n-constants-en_US.vflset/www-i18n-constants.jswww.youtube.com/s/desktop/4329498d/... https://www.youtube.com/s/desktop/4329498d/jsbin/www-i18n-constants-en_US.vflset/www-i18n-constants.js — 200 — 1.6 KiB — 151 ms — h2https://www.youtube.com/s/desktop/4329498d/jsbin/spf.vflset/spf.jswww.youtube.com/s/desktop/4329498d/... https://www.youtube.com/s/desktop/4329498d/jsbin/spf.vflset/spf.js — 200 — 11.9 KiB — 152 ms — h2https://www.youtube.com/s/desktop/4329498d/jsbin/network.vflset/network.jswww.youtube.com/s/desktop/4329498d/... https://www.youtube.com/s/desktop/4329498d/jsbin/network.vflset/network.js — 200 — 4.9 KiB — 153 ms — h2https://fonts.googleapis.com/css2?family=Roboto:wght@300;400;500;700&family=YouTube+Sans:wght@300..900&display=swapfonts.googleapis.com/css2?family=Ro... https://fonts.googleapis.com/css2?family=Roboto:wght@300;400;500;700&family=YouTube+Sans:wght@300..900&display=swap — 200 — 15.4 KiB — 183 ms — h2https://www.youtube.com/s/desktop/4329498d/cssbin/www-main-desktop-home-page-skeleton.csswww.youtube.com/s/desktop/4329498d/... https://www.youtube.com/s/desktop/4329498d/cssbin/www-main-desktop-home-page-skeleton.css — 200 — 1.0 KiB — 137 ms — h2https://www.youtube.com/s/desktop/4329498d/cssbin/www-onepick.csswww.youtube.com/s/desktop/4329498d/... https://www.youtube.com/s/desktop/4329498d/cssbin/www-onepick.css — 200 — 343 B — 138 ms — h2https://www.youtube.com/s/_/ytmainappweb/_/ss/k=ytmainappweb.kevlar_base.yAlYZ9FNrfs.L.B1.O/am=AAAAQIAA8AE/d=0/br=1/rs=AGKMywGdRKA4b1jWacDinGyt7RTj-GA9Pwwww.youtube.com/s/_/ytmainappweb/_/... https://www.youtube.com/s/_/ytmainappweb/_/ss/k=ytmainappweb.kevlar_base.yAlYZ9FNrfs.L.B1.O/am=AAAAQIAA8AE/d=0/br=1/rs=AGKMywGdRKA4b1jWacDinGyt7RTj-GA9Pw — 200 — 271.8 KiB — 166 ms — h2https://www.youtube.com/s/desktop/4329498d/cssbin/www-main-desktop-watch-page-skeleton.csswww.youtube.com/s/desktop/4329498d/... https://www.youtube.com/s/desktop/4329498d/cssbin/www-main-desktop-watch-page-skeleton.css — 200 — 1.4 KiB — 37 ms — h3https://www.youtube.com/manifest.webmanifestwww.youtube.com/manifest.webmanifes... https://www.youtube.com/manifest.webmanifest — 200 — 1.9 KiB — 82 ms — h3https://accounts.google.com/ServiceLogin?service=youtube&uilel=3&passive=true&continue=https%3A%2F%2Fwww.youtube.com%2Fsignin%3Faction_handle_signin%3Dtrue%26app%3Ddesktop%26hl%3Den%26next%3D%252Fsignin_passive%26feature%3Dpassive&hl=enaccounts.google.com/ServiceLogin?se... https://accounts.google.com/ServiceLogin?service=youtube&uilel=3&passive=true&continue=https%3A%2F%2Fwww.youtube.com%2Fsignin%3Faction_handle_signin%3Dtrue%26app%3Ddesktop%26hl%3Den%26next%3D%252Fsignin_passive%26feature%3Dpassive&hl=en — 302 — 1.3 KiB — 100 ms — h2https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2fonts.gstatic.com/s/roboto/v51/KFO7... https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 200 — 36.7 KiB — 64 ms — h3https://accounts.google.com/InteractiveLogin?continue=https://www.youtube.com/signin?action_handle_signin%3Dtrue%26app%3Ddesktop%26hl%3Den%26next%3D%252Fsignin_passive%26feature%3Dpassive&hl=en&passive=true&service=youtube&uilel=3&dsh=S1931172591:1776358536723327accounts.google.com/InteractiveLogi... https://accounts.google.com/InteractiveLogin?continue=https://www.youtube.com/signin?action_handle_signin%3Dtrue%26app%3Ddesktop%26hl%3Den%26next%3D%252Fsignin_passive%26feature%3Dpassive&hl=en&passive=true&service=youtube&uilel=3&dsh=S1931172591:1776358536723327 — 302 — 852 B — 49 ms — h2https://accounts.google.com/v3/signin/identifier?continue=https%3A%2F%2Fwww.youtube.com%2Fsignin%3Faction_handle_signin%3Dtrue%26app%3Ddesktop%26hl%3Den%26next%3D%252Fsignin_passive%26feature%3Dpassive&dsh=S1931172591%3A1776358536723327&hl=en&passive=true&service=youtube&uilel=3&flowName=GlifWebSignIn&flowEntry=ServiceLogin&ifkv=AT1y2_UWPn8ikYHS0_cj-vVqRwJhdmlRcdt9CBvnQ-JuRilQyG6m_dStRQW_A0J9Ggt_ogDTpqes_waccounts.google.com/v3/signin/ident... https://accounts.google.com/v3/signin/identifier?continue=https%3A%2F%2Fwww.youtube.com%2Fsignin%3Faction_handle_signin%3Dtrue%26app%3Ddesktop%26hl%3Den%26next%3D%252Fsignin_passive%26feature%3Dpassive&dsh=S1931172591%3A1776358536723327&hl=en&passive=true&service=youtube&uilel=3&flowName=GlifWebSignIn&flowEntry=ServiceLogin&ifkv=AT1y2_UWPn8ikYHS0_cj-vVqRwJhdmlRcdt9CBvnQ-JuRilQyG6m_dStRQW_A0J9Ggt_ogDTpqes_w — 403 — 2.8 KiB — 74 ms — h2https://www.youtube.com/s/search/audio/failure.mp3www.youtube.com/s/search/audio/fail... https://www.youtube.com/s/search/audio/failure.mp3 — 206 — 6.4 KiB — 61 ms — h3https://www.youtube.com/s/search/audio/no_input.mp3www.youtube.com/s/search/audio/no_i... https://www.youtube.com/s/search/audio/no_input.mp3 — 206 — 6.8 KiB — 63 ms — h3https://www.youtube.com/s/search/audio/open.mp3www.youtube.com/s/search/audio/open... https://www.youtube.com/s/search/audio/open.mp3 — 206 — 6.0 KiB — 56 ms — h3https://www.youtube.com/s/search/audio/success.mp3www.youtube.com/s/search/audio/succ... https://www.youtube.com/s/search/audio/success.mp3 — 206 — 6.5 KiB — 65 ms — h3https://www.google.com/js/th/cdHZnmAh7yL5wO3Dlc3wxOFdaDuUvCTre1L4S51GVXg.jswww.google.com/js/th/cdHZnmAh7yL5wO... https://www.google.com/js/th/cdHZnmAh7yL5wO3Dlc3wxOFdaDuUvCTre1L4S51GVXg.js — 200 — 23.1 KiB — 61 ms — h3data:application/json;base64,eyJhZFBsYWNlbWVudHMiOnRydWUsInBsYXllckFkcyI6dHJ1ZSwicGxheWVyUmVzcG9uc2…data:application/json;base64,eyJhZF... data:application/json;base64,eyJhZFBsYWNlbWVudHMiOnRydWUsInBsYXllckFkcyI6dHJ1ZSwicGxheWVyUmVzcG9uc2… — 200 — 328 B — 7 ms — datadata:application/json;base64,W3siYWRQbGFjZW1lbnRzIjp0cnVlLCJwbGF5ZXJBZHMiOnRydWUsInBsYXllclJlc3Bvbn…data:application/json;base64,W3siYW... data:application/json;base64,W3siYWRQbGFjZW1lbnRzIjp0cnVlLCJwbGF5ZXJBZHMiOnRydWUsInBsYXllclJlc3Bvbn… — 200 — 96 B — 1 ms — 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0 ms 1.0 s 2.0 s 3.0 s FCP 1.1 s LCP 3.6 shttps://youtube.com// https://youtube.com/ — 301 — 2.1 KiB — 83 ms — h2https://www.youtube.com/www.youtube.com/ https://www.youtube.com/ — 200 — 76.8 KiB — 341 ms — h2https://i.ytimg.com/generate_204i.ytimg.com/generate_204 https://i.ytimg.com/generate_204 — 204 — 118 B — 142 ms — h2https://www.youtube.com/s/_/ytmainappweb/_/js/k=ytmainappweb.kevlar_base.en_US.IFuzsR39iKY.es5.O/am=AAAAQAAAoAE/d=1/br=1/rs=AGKMywEoaqUxZgRRIyE-HwamtYXw-7Eqzg/m=kevlar_base_module,kevlar_main_modulewww.youtube.com/s/_/ytmainappweb/_/... https://www.youtube.com/s/_/ytmainappweb/_/js/k=ytmainappweb.kevlar_base.en_US.IFuzsR39iKY.es5.O/am=AAAAQAAAoAE/d=1/br=1/rs=AGKMywEoaqUxZgRRIyE-HwamtYXw-7Eqzg/m=kevlar_base_module,kevlar_main_module — 200 — 1.8 MiB — 261 ms — h2https://www.youtube.com/s/desktop/4329498d/jsbin/web-animations-next-lite.min.vflset/web-animations-next-lite.min.jswww.youtube.com/s/desktop/4329498d/... 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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 2392ms · 2488KB · €26/mo
www.youtube.com
Other
Costly
Execution 1112ms
Transfer 1834 KB
Unused 61%
Monthly Cost €12/mo
www.youtube.com
Other
Costly
Execution 571ms
Transfer 14 KB
Monthly Cost €6/mo
Unattributable
Other
Costly
Execution 414ms
Transfer 0 KB
Monthly Cost €4/mo
www.youtube.com
Other
Optional
Execution 164ms
Transfer 639 KB
Unused 73%
Monthly Cost €2/mo
www.youtube.com
Other
Optional
Execution 131ms
Transfer 0 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.youtube.com adds 1112ms and costs ~€12/month
  • www.youtube.com adds 571ms and costs ~€6/month
  • Unattributable adds 414ms and costs ~€4/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.youtube.com takes 1112ms 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

61% of www.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

www.youtube.com takes 571ms 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 414ms 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

73% of www.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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