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Performance

· 27 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
81
GRADE
B
FIX
5
REVIEW
4
PASS
14
INFO
4

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

Mobile Desktop
36
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.
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.

6.50 s

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

8.29 s

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

1.23 s

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.

6.50 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.

12.89 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
27
14 PASS 4 REVIEW 5 FIX
D
Third-Party Impact
Action
98% third-party, 0 ms blocking
FIX
98% third-party, 0 ms blocking
Warning::
Third-party code accounts for 98% of page weight (1.3 MiB of 1.3 MiB)
Info::
Third-party blocking time is low (0 ms)
98%
First-party Third-party
F
JS Execution Cost
Action
4502ms total JS execution
FIX
4502ms total JS execution
Warning::
https://m.youtube.com/s/_/ytmweb/_/js/k=ytmweb.c3_...: 2281ms CPU time
Warning::
Unattributable: 953ms CPU time
Warning::
https://m.youtube.com/: 449ms CPU time
Warning::
https://m.youtube.com/s/player/8fb635c2/player-pla...: 293ms CPU time
Info::
https://m.youtube.com/s/_/ytmweb/_/js/k=ytmweb.c3_...: 127ms CPU time
Warning::
Third-party scripts: 4502ms (100% of total)

Main Thread Breakdown

Script Evaluation 62% Other 19% Script Parsing & Compilation 10% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://m.youtube.com/s/_/ytmweb/_/js/k=ytmweb.c3_base_cow_tracing.en_US.W8UirZTZKS8.2021.O/am=AAAAAGA/d=1/br=1/rs=ABnK5FIoY1LNB04UKhjMlnpXcT2StBmISw/m=root,c3_base_cow_tracing,zcskIc,SFvGjc,cDTHu,JoU6vf,Di4hBc,dpUCFd,Nuilue2281ms1806ms195ms3rd
Unattributable953ms188ms0ms3rd
https://m.youtube.com/449ms56ms55ms3rd
https://m.youtube.com/s/player/8fb635c2/player-plasma-es6-en_US.vflset/base.js293ms97ms191ms3rd
https://m.youtube.com/s/_/ytmweb/_/js/k=ytmweb.c3_base_cow_tracing.en_US.W8UirZTZKS8.2021.O/am=AAAAAGA/d=1/exm=Di4hBc,JoU6vf,Nuilue,Rv3e3d,SFvGjc,c3_base_cow_tracing,cDTHu,dpUCFd,root,zcskIc/ed=1/br=1/rs=ABnK5FIoY1LNB04UKhjMlnpXcT2StBmISw/m=hBod9c127ms88ms15ms3rd
https://m.youtube.com/s/_/ytmweb/_/js/k=ytmweb.c3_base_cow_tracing.en_US.W8UirZTZKS8.2021.O/am=AAAAAGA/d=1/exm=Di4hBc,JoU6vf,Nuilue,SFvGjc,c3_base_cow_tracing,cDTHu,dpUCFd,root,zcskIc/ed=1/br=1/rs=ABnK5FIoY1LNB04UKhjMlnpXcT2StBmISw/m=Rv3e3d126ms116ms8ms3rd
https://m.youtube.com/s/_/ytmweb/_/js/k=ytmweb.c3_base_cow_tracing.en_US.W8UirZTZKS8.2021.O/am=AAAAAGA/d=1/exm=Cj1YCb,Di4hBc,JoU6vf,Nuilue,Rv3e3d,SFvGjc,c3_base_cow_tracing,cDTHu,dpUCFd,hBod9c,hjrNn,jVxNAb,qiuJmb,root,tkEWoe,zcskIc/ed=1/br=1/rs=ABnK5FIoY1LNB04UKhjMlnpXcT2StBmISw/m=ERsVff107ms64ms38ms3rd
https://www.google.com/js/th/rcHyBCfnx63Q5bkx-VZJDAm13ckst38UoFjazA7tkuA.js106ms84ms12ms3rd
https://m.youtube.com/s/_/ytmweb/_/js/k=ytmweb.c3_base_cow_tracing.en_US.W8UirZTZKS8.2021.O/am=AAAAAGA/d=1/exm=Di4hBc,JoU6vf,Nuilue,Rv3e3d,SFvGjc,c3_base_cow_tracing,cDTHu,dpUCFd,hBod9c,root,zcskIc/ed=1/br=1/rs=ABnK5FIoY1LNB04UKhjMlnpXcT2StBmISw/m=qiuJmb,hjrNn,tkEWoe,Cj1YCb,jVxNAb61ms53ms2ms3rd
F
JS Bundles
Action
11 scripts, 618 KB unused
FIX
11 scripts, 618 KB unused
Warning::
https://m.youtube.com/s/player/8fb635c2/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_...: 223 KB unused (52%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://m.youtube.com/s/_/ytmweb/_/js/k=ytmweb.c3_...: 61 KB unused (77%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://m.youtube.com/s/_/ytmweb/_/js/k=ytmweb.c3_...: 26 KB unused (87%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 618 KB
618 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://m.youtube.com/s/player/8fb635c2/player-plasma-es6-en_US.vflset/base.js418 KB308 KB (74%)✓3rd
https://m.youtube.com/s/_/ytmweb/_/js/k=ytmweb.c3_base_cow_tracing.en_US.W8UirZTZKS8.2021.O/am=AAAAAGA/d=1/br=1/rs=ABnK5FIoY1LNB04UKhjMlnpXcT2StBmISw/m=root,c3_base_cow_tracing,zcskIc,SFvGjc,cDTHu,JoU6vf,Di4hBc,dpUCFd,Nuilue426 KB223 KB (52%)✓3rd
https://m.youtube.com/s/_/ytmweb/_/js/k=ytmweb.c3_base_cow_tracing.en_US.W8UirZTZKS8.2021.O/am=AAAAAGA/d=1/exm=Cj1YCb,Di4hBc,JoU6vf,Nuilue,Rv3e3d,SFvGjc,c3_base_cow_tracing,cDTHu,dpUCFd,hBod9c,hjrNn,jVxNAb,qiuJmb,root,tkEWoe,zcskIc/ed=1/br=1/rs=ABnK5FIoY1LNB04UKhjMlnpXcT2StBmISw/m=ERsVff80 KB61 KB (77%)✓3rd
https://m.youtube.com/s/_/ytmweb/_/js/k=ytmweb.c3_base_cow_tracing.en_US.W8UirZTZKS8.2021.O/am=AAAAAGA/d=1/exm=Di4hBc,JoU6vf,Nuilue,Rv3e3d,SFvGjc,c3_base_cow_tracing,cDTHu,dpUCFd,root,zcskIc/ed=1/br=1/rs=ABnK5FIoY1LNB04UKhjMlnpXcT2StBmISw/m=hBod9c30 KB26 KB (87%)✓3rd
https://m.youtube.com/static/r/58695dba/scheduler.vflset/scheduler.js3 KB—✓3rd
https://m.youtube.com/static/r/58695dba/fetch_polyfill.vflset/fetch_polyfill.js3 KB—✓3rd
https://m.youtube.com/s/_/ytmweb/_/js/k=ytmweb.c3_base_cow_tracing.en_US.W8UirZTZKS8.2021.O/am=AAAAAGA/d=1/exm=Di4hBc,JoU6vf,Nuilue,SFvGjc,c3_base_cow_tracing,cDTHu,dpUCFd,root,zcskIc/ed=1/br=1/rs=ABnK5FIoY1LNB04UKhjMlnpXcT2StBmISw/m=Rv3e3d19 KB—✓3rd
https://www.google.com/js/th/rcHyBCfnx63Q5bkx-VZJDAm13ckst38UoFjazA7tkuA.js23 KB—✓3rd
https://m.youtube.com/s/_/ytmweb/_/js/k=ytmweb.c3_base_cow_tracing.en_US.W8UirZTZKS8.2021.O/am=AAAAAGA/d=1/exm=Di4hBc,JoU6vf,Nuilue,Rv3e3d,SFvGjc,c3_base_cow_tracing,cDTHu,dpUCFd,hBod9c,root,zcskIc/ed=1/br=1/rs=ABnK5FIoY1LNB04UKhjMlnpXcT2StBmISw/m=qiuJmb,hjrNn,tkEWoe,Cj1YCb,jVxNAb2 KB—✓3rd
https://m.youtube.com/s/_/ytmweb/_/js/k=ytmweb.c3_base_cow_tracing.en_US.W8UirZTZKS8.2021.O/am=AAAAAGA/d=1/exm=Cj1YCb,Di4hBc,ERsVff,JoU6vf,Nuilue,Rv3e3d,SFvGjc,c3_base_cow_tracing,cDTHu,dpUCFd,hBod9c,hjrNn,jVxNAb,qiuJmb,root,tkEWoe,zcskIc/ed=1/br=1/rs=ABnK5FIoY1LNB04UKhjMlnpXcT2StBmISw/m=dfXAxf1 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

D
Page Weight Inventory
Action
72 resources · 1.3 MB · 618 KB savings available
FIX
72 resources · 1.3 MB · 618 KB savings available
Warning::
Page weight 1.3 MB exceeds 1 MB target by 302 KB
Got: 1.3 MB Expected: ≤ 1 MB
Info::
~618 KB of savings available
Warning::
67 third-party resources (98% of weight)
Info::
2 resources over 200KB
72 resources · 1.3 MiB · 67 third-party 301.6 KiB over 1MB target
JavaScript 76% · 1005.3 KiB
CSS 14% · 179.7 KiB
Document 5% · 64.3 KiB
Font 2% · 28.1 KiB
Media 2% · 26.3 KiB
Image 1% · 12.8 KiB
Other 1% · 9.2 KiB

~618.5 KiB of savings available

Remove unused JavaScript: 618.5 KiB
D
HTTP Caching
Action
no-store (uncacheable)
FIX
no-store (uncacheable)
Info::
Cache-Control: no-store prevents all caching
Intentional for dynamic content, but increases server load for every page view.
Got: no-cache, no-store, max-age=0, must-revalidate
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

no-cache, no-store, max-age=0, must-revalidate

DirectiveValueMeaning
no-cache—Cache but always revalidate first
no-store—Never cache this response
max-age0Cache for 0 seconds
must-revalidate—Must recheck with server after expiry
B
Page Weight Budget
1.3 MB transferred, 72 requests
REVIEW
1.3 MB transferred, 72 requests
Info::
Page weighs 5.3 MB (1.3 MB transferred)
Warning::
JavaScript is 1005 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1005 KB
Info::
72 HTTP requests
Info::
Estimated 0.27 g CO2 per page load
1.3 MB / 2.4 MB budget
1.3 MB transferred
72 requests
0.27 g CO2 per page load
JavaScript 1005.3 KiB 76%
CSS 179.7 KiB 14%
HTML 63.0 KiB 5%
Fonts 28.1 KiB 2%
Other 26.3 KiB 2%
Other 16.2 KiB 1%
Other 5.5 KiB 0%
Images 1.2 KiB 0%
Other 287 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
Compression Algorithm
Action
Main response served uncompressed
REVIEW
Main response served uncompressed
Info::
Main HTML response has no Content-Encoding (uncompressed)
The main HTML document is served without compression. The Text Compression section above lists the broader picture; for the main response specifically, even gzip would shave ~70-80% off most text payloads.
B
Server-Timing Observability
No Server-Timing header found
REVIEW
No Server-Timing header found
Info::
No Server-Timing header found
Server-Timing exposes backend timing breakdowns to browser DevTools (e.g., `db: 45ms; render: 120ms; cache: 2ms`). Useful for diagnosing slow pages without backend log access. Most modern frameworks (Next.js, Cloudflare Workers, Fastly) emit it automatically; absence on a managed platform usually means telemetry headers are stripped at the edge.
B
JavaScript Blocking
2 JS blocking issue(s) detected
REVIEW
2 JS blocking issue(s) detected
Warning::
9 render-blocking <script src> tag(s) without async/defer
Each `<script src=...>` without `async`, `defer`, or `type="module"` blocks HTML parsing while the browser fetches and executes it. The block lasts the entire round-trip + execution time -- on slow networks this translates directly into LCP delay. Add `defer` (executes after parse, in source order) for scripts that interact with the DOM, or `async` (executes whenever ready) for analytics / independent scripts. Module scripts (`type="module"`) are deferred by default.
Warning::
Total JS execution time is 4.5 s -- over the 3.5s budget
Total JavaScript execution (parse + compile + run) across all scripts exceeds 3.5 seconds. On low-end devices that becomes 7-15+ seconds and shows up directly in TBT and INP. Reduce by: tree-shaking unused dependencies, code-splitting (dynamic `import()`), removing or deferring third-party tracking, and replacing heavy frameworks where they're not needed.
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 6.5 s LCP 8.3 shttps://fonts.gstatic.com/s/roboto/v18/KFOmCnqEu92Fr1Mu4mxPKTU1Kg.ttfKFOmCnqEu92Fr1Mu4mxPKTU... https://fonts.gstatic.com/s/roboto/v18/KFOmCnqEu92Fr1Mu4mxPKTU1Kg.ttf — 14.0 KiB — 211 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v18/KFOlCnqEu92Fr1MmEU9fBBc9AMP6lQ.ttfKFOlCnqEu92Fr1MmEU9fBBc... https://fonts.gstatic.com/s/roboto/v18/KFOlCnqEu92Fr1MmEU9fBBc9AMP6lQ.ttf — 14.1 KiB — 199 ms — font-display: swap
KFOmCnqEu92Fr1Mu4mxPKTU... ttf swap
Size 14 KB
Load time 211 ms
Start 995 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 199 ms
Start 1.0 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 ~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+
HTTP/3 (QUIC)
HTTP/3 advertised via Alt-Svc
PASS
HTTP/3 advertised via Alt-Svc
Info::
HTTP/3 (QUIC) is supported
First-load mobile users on cellular networks see meaningful latency improvements with HTTP/3. The QUIC transport collapses TLS + TCP handshakes into one and recovers faster from packet loss.
A+
LCP Image Preload
LCP preload audit not available
PASS
LCP preload audit not available
Info::
LCP image preload audit not available for this scan
A+
Main HTML Cache-Control
Main HTML uses no-store -- correct for sensitive/dynamic content
PASS
Main HTML uses no-store -- correct for sensitive/dynamic content
Info::
Main HTML uses no-store -- correct for sensitive/dynamic content
Got: no-cache, no-store, max-age=0, must-revalidate
A+
Server Response Intelligence
2 server-response signal(s) detected
PASS
2 server-response signal(s) detected
Info::
`Vary` header declared: Sec-CH-Viewport-Width, Sec-CH-DPR, Device-Memory
The page declares a `Vary` header, telling downstream caches which request headers the response varies on. Critical for content-negotiated responses (compression, language, cookies, device class).
Info::
No `ETag` or `Last-Modified` -- conditional GET not supported
Without either header, browsers can't issue conditional GETs and refresh always re-downloads the full response body even when nothing changed. Add `ETag: "<hash>"` (or `Last-Modified: <date>`) on cacheable responses; the server returns 304 Not Modified when the client's cached copy is still valid, saving bandwidth.
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
CSS Performance Depth
1 CSS depth issue(s) detected
PASS
1 CSS depth issue(s) detected
Warning::
8 render-blocking stylesheet(s) -- recommended: <=3
Each `<link rel="stylesheet">` without a non-blocking `media` attribute holds up the first paint. Browsers download all of them before painting any content. Consolidate into 1-2 critical-path stylesheets; defer non-critical CSS via `<link rel="stylesheet" media="print" onload="this.media='all'">` or via the loadCSS pattern; inline above-the-fold CSS in `<style>` to short-circuit the request entirely.
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

Network Waterfall
72 requests over 3038ms
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 6.5 s LCP 8.3 shttps://www.youtube.com// https://www.youtube.com/ — 302 — 2.5 KiB — 231 ms — h2https://m.youtube.com/m.youtube.com/ https://m.youtube.com/ — 200 — 60.2 KiB — 439 ms — h3https://m.youtube.com/static/r/58695dba/scheduler.vflset/scheduler.jsm.youtube.com/static/r/58695dba/sch... https://m.youtube.com/static/r/58695dba/scheduler.vflset/scheduler.js — 200 — 3.1 KiB — 26 ms — h3https://m.youtube.com/static/r/58695dba/fetch_polyfill.vflset/fetch_polyfill.jsm.youtube.com/static/r/58695dba/fet... https://m.youtube.com/static/r/58695dba/fetch_polyfill.vflset/fetch_polyfill.js — 200 — 2.6 KiB — 24 ms — h3https://m.youtube.com/s/_/ytmweb/_/js/k=ytmweb.c3_base_cow_tracing.en_US.W8UirZTZKS8.2021.O/am=AAAAAGA/d=1/br=1/rs=ABnK5FIoY1LNB04UKhjMlnpXcT2StBmISw/m=root,c3_base_cow_tracing,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_cow_tracing.en_US.W8UirZTZKS8.2021.O/am=AAAAAGA/d=1/br=1/rs=ABnK5FIoY1LNB04UKhjMlnpXcT2StBmISw/m=root,c3_base_cow_tracing,zcskIc,SFvGjc,cDTHu,JoU6vf,Di4hBc,dpUCFd,Nuilue — 200 — 425.5 KiB — 42 ms — h3https://m.youtube.com/s/_/ytmweb/_/ss/k=ytmweb.c3_base_cow_tracing.AOv-wf2nFUU.L.W.O/am=AAAAAGBAAAED/d=0/br=1/rs=ABnK5FK_wep1hQD5Ax1EHoAt6CIBFp92cgm.youtube.com/s/_/ytmweb/_/ss/k=ytm... https://m.youtube.com/s/_/ytmweb/_/ss/k=ytmweb.c3_base_cow_tracing.AOv-wf2nFUU.L.W.O/am=AAAAAGBAAAED/d=0/br=1/rs=ABnK5FK_wep1hQD5Ax1EHoAt6CIBFp92cg — 200 — 120.8 KiB — 27 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 — 211 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 — 199 ms — h3https://m.youtube.com/s/_/ytmweb/_/js/k=ytmweb.c3_base_cow_tracing.en_US.W8UirZTZKS8.2021.O/am=AAAAAGA/d=1/exm=Di4hBc,JoU6vf,Nuilue,SFvGjc,c3_base_cow_tracing,cDTHu,dpUCFd,root,zcskIc/ed=1/br=1/rs=ABnK5FIoY1LNB04UKhjMlnpXcT2StBmISw/m=Rv3e3dm.youtube.com/s/_/ytmweb/_/js/k=ytm... https://m.youtube.com/s/_/ytmweb/_/js/k=ytmweb.c3_base_cow_tracing.en_US.W8UirZTZKS8.2021.O/am=AAAAAGA/d=1/exm=Di4hBc,JoU6vf,Nuilue,SFvGjc,c3_base_cow_tracing,cDTHu,dpUCFd,root,zcskIc/ed=1/br=1/rs=ABnK5FIoY1LNB04UKhjMlnpXcT2StBmISw/m=Rv3e3d — 200 — 19.0 KiB — 6 ms — 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https://fonts.gstatic.com/s/i/youtube_outline_experimental/arrow_left/v8/24px.svg — 200 — 219 B — 9 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 — 8 ms — h3https://gstatic.com/youtube/img/branding/youtubeicon/2x/youtube_main_icon_2x_158x110.pnggstatic.com/youtube/img/branding/yo... https://gstatic.com/youtube/img/branding/youtubeicon/2x/youtube_main_icon_2x_158x110.png — 301 — 301 B — 212 ms — h2https://fonts.gstatic.com/s/i/youtube_fill_experimental/flag/v10/24px.svgfonts.gstatic.com/s/i/youtube_fill_... https://fonts.gstatic.com/s/i/youtube_fill_experimental/flag/v10/24px.svg — 200 — 283 B — 6 ms — h3https://fonts.gstatic.com/s/i/youtube_outline_experimental/flag/v10/24px.svgfonts.gstatic.com/s/i/youtube_outli... https://fonts.gstatic.com/s/i/youtube_outline_experimental/flag/v10/24px.svg — 200 — 349 B — 8 ms — h3https://fonts.gstatic.com/s/i/youtube_fill_experimental/home/v10/24px.svgfonts.gstatic.com/s/i/youtube_fill_... https://fonts.gstatic.com/s/i/youtube_fill_experimental/home/v10/24px.svg — 200 — 240 B — 7 ms — h3https://fonts.gstatic.com/s/i/youtube_outline_experimental/home/v10/24px.svgfonts.gstatic.com/s/i/youtube_outli... https://fonts.gstatic.com/s/i/youtube_outline_experimental/home/v10/24px.svg — 200 — 285 B — 7 ms — h3https://googleads.g.doubleclick.net/pagead/idgoogleads.g.doubleclick.net/pagead/... https://googleads.g.doubleclick.net/pagead/id — 302 — 23 B — 433 ms — h3https://m.youtube.com/s/_/ytmweb/_/js/k=ytmweb.c3_base_cow_tracing.en_US.W8UirZTZKS8.2021.O/am=AAAAAGA/d=1/exm=Cj1YCb,Di4hBc,ERsVff,JoU6vf,Nuilue,Rv3e3d,SFvGjc,c3_base_cow_tracing,cDTHu,dpUCFd,hBod9c,hjrNn,jVxNAb,qiuJmb,root,tkEWoe,zcskIc/ed=1/br=1/rs=ABnK5FIoY1LNB04UKhjMlnpXcT2StBmISw/m=dfXAxfm.youtube.com/s/_/ytmweb/_/js/k=ytm... https://m.youtube.com/s/_/ytmweb/_/js/k=ytmweb.c3_base_cow_tracing.en_US.W8UirZTZKS8.2021.O/am=AAAAAGA/d=1/exm=Cj1YCb,Di4hBc,ERsVff,JoU6vf,Nuilue,Rv3e3d,SFvGjc,c3_base_cow_tracing,cDTHu,dpUCFd,hBod9c,hjrNn,jVxNAb,qiuJmb,root,tkEWoe,zcskIc/ed=1/br=1/rs=ABnK5FIoY1LNB04UKhjMlnpXcT2StBmISw/m=dfXAxf — 200 — 1.1 KiB — 5 ms — h3https://www.gstatic.com/youtube/img/icons/mweb/youtube_fill/logo_with_text/v3/20px.svgwww.gstatic.com/youtube/img/icons/m... https://www.gstatic.com/youtube/img/icons/mweb/youtube_fill/logo_with_text/v3/20px.svg — 200 — 1.5 KiB — 183 ms — h2https://fonts.gstatic.com/s/i/youtube_fill_experimental/mic/v14/24px.svgfonts.gstatic.com/s/i/youtube_fill_... https://fonts.gstatic.com/s/i/youtube_fill_experimental/mic/v14/24px.svg — 200 — 285 B — 6 ms — h3https://fonts.gstatic.com/s/i/youtube_outline_experimental/mic/v14/24px.svgfonts.gstatic.com/s/i/youtube_outli... https://fonts.gstatic.com/s/i/youtube_outline_experimental/mic/v14/24px.svg — 200 — 305 B — 7 ms — h3https://fonts.gstatic.com/s/i/youtube_outline_experimental/overflow_horizontal/v6/24px.svgfonts.gstatic.com/s/i/youtube_outli... https://fonts.gstatic.com/s/i/youtube_outline_experimental/overflow_horizontal/v6/24px.svg — 200 — 182 B — 5 ms — h3https://m.youtube.com/youtubei/v1/feedback?prettyPrint=falsem.youtube.com/youtubei/v1/feedback?... https://m.youtube.com/youtubei/v1/feedback?prettyPrint=false — 200 — 730 B — 233 ms — h3https://fonts.gstatic.com/s/i/youtube_outline_experimental/overflow_vertical/v13/24px.svgfonts.gstatic.com/s/i/youtube_outli... https://fonts.gstatic.com/s/i/youtube_outline_experimental/overflow_vertical/v13/24px.svg — 200 — 185 B — 5 ms — h3https://www.gstatic.com/youtube/img/icons/mweb/youtube_fill/play_circle_shorts/v2/24px.svgwww.gstatic.com/youtube/img/icons/m... https://www.gstatic.com/youtube/img/icons/mweb/youtube_fill/play_circle_shorts/v2/24px.svg — 200 — 311 B — 145 ms — h2https://fonts.gstatic.com/s/i/youtube_fill_experimental/search/v15/24px.svgfonts.gstatic.com/s/i/youtube_fill_... https://fonts.gstatic.com/s/i/youtube_fill_experimental/search/v15/24px.svg — 200 — 265 B — 5 ms — h3https://fonts.gstatic.com/s/i/youtube_outline_experimental/search/v15/24px.svgfonts.gstatic.com/s/i/youtube_outli... https://fonts.gstatic.com/s/i/youtube_outline_experimental/search/v15/24px.svg — 200 — 255 B — 6 ms — h3https://fonts.gstatic.com/s/i/youtube_fill_experimental/share/v12/24px.svgfonts.gstatic.com/s/i/youtube_fill_... https://fonts.gstatic.com/s/i/youtube_fill_experimental/share/v12/24px.svg — 200 — 265 B — 15 ms — h3https://www.youtube.com/s/search/audio/failure.mp3/s/search/audio/failure.mp3 https://www.youtube.com/s/search/audio/failure.mp3 — 206 — 6.7 KiB — 225 ms — h2https://www.youtube.com/s/search/audio/success.mp3/s/search/audio/success.mp3 https://www.youtube.com/s/search/audio/success.mp3 — 206 — 6.6 KiB — 214 ms — h2https://www.youtube.com/s/search/audio/open.mp3/s/search/audio/open.mp3 https://www.youtube.com/s/search/audio/open.mp3 — 206 — 6.1 KiB — 220 ms — h2https://www.youtube.com/s/search/audio/no_input.mp3/s/search/audio/no_input.mp3 https://www.youtube.com/s/search/audio/no_input.mp3 — 206 — 6.9 KiB — 414 ms — h2https://fonts.gstatic.com/s/i/youtube_outline_experimental/share/v12/24px.svgfonts.gstatic.com/s/i/youtube_outli... https://fonts.gstatic.com/s/i/youtube_outline_experimental/share/v12/24px.svg — 200 — 426 B — 9 ms — h3https://fonts.gstatic.com/s/i/youtube_fill_experimental/shorts/v3/24px.svgfonts.gstatic.com/s/i/youtube_fill_... https://fonts.gstatic.com/s/i/youtube_fill_experimental/shorts/v3/24px.svg — 200 — 262 B — 6 ms — h3https://fonts.gstatic.com/s/i/youtube_outline_experimental/shorts/v3/24px.svgfonts.gstatic.com/s/i/youtube_outli... https://fonts.gstatic.com/s/i/youtube_outline_experimental/shorts/v3/24px.svg — 200 — 339 B — 6 ms — h3https://www.gstatic.com/youtube/img/branding/youtubeicon/2x/youtube_main_icon_2x_158x110.pngwww.gstatic.com/youtube/img/brandin... https://www.gstatic.com/youtube/img/branding/youtubeicon/2x/youtube_main_icon_2x_158x110.png — 200 — 1.2 KiB — 208 ms — h2https://fonts.gstatic.com/s/i/youtube_fill_experimental/text_align_left/v2/24px.svgfonts.gstatic.com/s/i/youtube_fill_... https://fonts.gstatic.com/s/i/youtube_fill_experimental/text_align_left/v2/24px.svg — 200 — 294 B — 7 ms — h3https://fonts.gstatic.com/s/i/youtube_outline_experimental/text_align_left/v2/24px.svgfonts.gstatic.com/s/i/youtube_outli... https://fonts.gstatic.com/s/i/youtube_outline_experimental/text_align_left/v2/24px.svg — 200 — 218 B — 11 ms — h3https://fonts.gstatic.com/s/i/youtube_fill_experimental/text_bubble/v4/24px.svgfonts.gstatic.com/s/i/youtube_fill_... https://fonts.gstatic.com/s/i/youtube_fill_experimental/text_bubble/v4/24px.svg — 200 — 259 B — 5 ms — h3https://fonts.gstatic.com/s/i/youtube_outline_experimental/text_bubble/v4/24px.svgfonts.gstatic.com/s/i/youtube_outli... https://fonts.gstatic.com/s/i/youtube_outline_experimental/text_bubble/v4/24px.svg — 200 — 303 B — 10 ms — h3https://fonts.gstatic.com/s/i/youtube_fill_experimental/thumb_down/v25/24px.svgfonts.gstatic.com/s/i/youtube_fill_... https://fonts.gstatic.com/s/i/youtube_fill_experimental/thumb_down/v25/24px.svg — 200 — 408 B — 16 ms — h3https://fonts.gstatic.com/s/i/youtube_outline_experimental/thumb_down/v25/24px.svgfonts.gstatic.com/s/i/youtube_outli... https://fonts.gstatic.com/s/i/youtube_outline_experimental/thumb_down/v25/24px.svg — 200 — 600 B — 8 ms — h3https://fonts.gstatic.com/s/i/youtube_fill_experimental/thumb_up/v23/24px.svgfonts.gstatic.com/s/i/youtube_fill_... https://fonts.gstatic.com/s/i/youtube_fill_experimental/thumb_up/v23/24px.svg — 200 — 418 B — 9 ms — h3https://fonts.gstatic.com/s/i/youtube_outline_experimental/thumb_up/v23/24px.svgfonts.gstatic.com/s/i/youtube_outli... https://fonts.gstatic.com/s/i/youtube_outline_experimental/thumb_up/v23/24px.svg — 200 — 572 B — 7 ms — h3https://fonts.gstatic.com/s/i/youtube_outline_experimental/waveform/v3/24px.svgfonts.gstatic.com/s/i/youtube_outli... https://fonts.gstatic.com/s/i/youtube_outline_experimental/waveform/v3/24px.svg — 200 — 229 B — 21 ms — h3https://fonts.gstatic.com/s/i/youtube_outline_experimental/x/v11/24px.svgfonts.gstatic.com/s/i/youtube_outli... https://fonts.gstatic.com/s/i/youtube_outline_experimental/x/v11/24px.svg — 200 — 236 B — 20 ms — h3https://m.youtube.com/generate_204?t-2MDQm.youtube.com/generate_204?t-2MDQ https://m.youtube.com/generate_204?t-2MDQ — 204 — 10 B — 7 ms — h3https://www.gstatic.com/youtube/img/icons/mweb/youtube_fill/youtube_shorts_brand_24/v2/24px.svgwww.gstatic.com/youtube/img/icons/m... https://www.gstatic.com/youtube/img/icons/mweb/youtube_fill/youtube_shorts_brand_24/v2/24px.svg — 200 — 341 B — 13 ms — h2https://fonts.gstatic.com/s/i/youtube_outline_experimental/compass/v9/24px.svgfonts.gstatic.com/s/i/youtube_outli... https://fonts.gstatic.com/s/i/youtube_outline_experimental/compass/v9/24px.svg — 200 — 349 B — 14 ms — h3https://fonts.gstatic.com/s/i/youtube_outline_experimental/person_circle/v10/24px.svgfonts.gstatic.com/s/i/youtube_outli... https://fonts.gstatic.com/s/i/youtube_outline_experimental/person_circle/v10/24px.svg — 200 — 310 B — 11 ms — h3https://fonts.gstatic.com/s/i/youtube_fill_experimental/person_circle/v10/24px.svgfonts.gstatic.com/s/i/youtube_fill_... https://fonts.gstatic.com/s/i/youtube_fill_experimental/person_circle/v10/24px.svg — 200 — 331 B — 11 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=S-418112871:1778413052786960accounts.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=S-418112871:1778413052786960 — 302 — 866 B — 376 ms — h2https://googleads.g.doubleclick.net/pagead/id?slf_rd=1googleads.g.doubleclick.net/pagead/... https://googleads.g.doubleclick.net/pagead/id?slf_rd=1 — 200 — 146 B — 217 ms — h3https://m.youtube.com/api/jnn/v1/GenerateITm.youtube.com/api/jnn/v1/GenerateIT https://m.youtube.com/api/jnn/v1/GenerateIT — 200 — 141 B — 210 ms — h3https://accounts.google.com/v3/signin/identifier?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&dsh=S-418112871%3A1778413052786960&hl=en&ltmpl=mobile&passive=true&service=youtube&uilel=3&flowName=GlifWebSignIn&flowEntry=ServiceLogin&ifkv=AWa2Pavw_25icSDU5wPbvkgeUxfE7XafuDjEbyW-A7QOY4oabZmzpO2tZxMXPVqcspqOshqMz4wpaccounts.google.com/v3/signin/ident... https://accounts.google.com/v3/signin/identifier?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&dsh=S-418112871%3A1778413052786960&hl=en&ltmpl=mobile&passive=true&service=youtube&uilel=3&flowName=GlifWebSignIn&flowEntry=ServiceLogin&ifkv=AWa2Pavw_25icSDU5wPbvkgeUxfE7XafuDjEbyW-A7QOY4oabZmzpO2tZxMXPVqcspqOshqMz4wp — 403 — 2.8 KiB — 338 ms — h2https://m.youtube.com/static/favicon.icom.youtube.com/static/favicon.ico https://m.youtube.com/static/favicon.ico — 200 — 452 B — 9 ms — h3https://m.youtube.com/s/player/8fb635c2/player-plasma-es6-en_US.vflset/base.jsm.youtube.com/s/player/8fb635c2/pla... https://m.youtube.com/s/player/8fb635c2/player-plasma-es6-en_US.vflset/base.js — 200 — 418.5 KiB — 54 ms — h3https://m.youtube.com/s/player/8fb635c2/mobile-polymer-player-svg-ias-mweb.cssm.youtube.com/s/player/8fb635c2/mob... https://m.youtube.com/s/player/8fb635c2/mobile-polymer-player-svg-ias-mweb.css — 200 — 58.9 KiB — 14 ms — h3https://static.doubleclick.net/instream/ad_status.jsstatic.doubleclick.net/instream/ad_... https://static.doubleclick.net/instream/ad_status.js — 200 — 495 B — 210 ms — h2https://m.youtube.com/youtubei/v1/log_event?alt=jsonm.youtube.com/youtubei/v1/log_event... https://m.youtube.com/youtubei/v1/log_event?alt=json — -1 — 0 B — 0 ms —
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 4502ms · 1058KB · $60/mo
m.youtube.com
Other
Costly
Execution 2281ms
Transfer 426 KB
Unused 52%
Monthly Cost $30/mo
Unattributable
Other
Costly
Execution 953ms
Transfer 0 KB
Monthly Cost $13/mo
m.youtube.com
Other
Costly
Execution 449ms
Transfer 60 KB
Monthly Cost $6/mo
m.youtube.com
Other
Costly
Execution 293ms
Transfer 418 KB
Unused 74%
Monthly Cost $4/mo
m.youtube.com
Other
Optional
Execution 127ms
Transfer 30 KB
Unused 87%
Monthly Cost $2/mo
m.youtube.com
Other
Optional
Execution 126ms
Transfer 19 KB
Monthly Cost $2/mo
m.youtube.com
Other
Optional
Execution 107ms
Transfer 80 KB
Unused 77%
Monthly Cost $1/mo
www.google.com
Other
Optional
Execution 106ms
Transfer 23 KB
Monthly Cost $1/mo
m.youtube.com
Other
Optional
Execution 61ms
Transfer 2 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • m.youtube.com adds 2281ms and costs ~$30/month
  • Unattributable adds 953ms and costs ~$13/month
  • m.youtube.com adds 449ms and costs ~$6/month
  • m.youtube.com adds 293ms 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

m.youtube.com takes 2281ms 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

52% 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 953ms 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 449ms 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 293ms 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

87% 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

77% 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

Real-User Performance (CrUX)
Field metrics from the Chrome User Experience Report
INFO

Chrome User Experience (CrUX)

Real-user metrics from the Chrome UX Report (2026-04-11 — 2026-05-08)

LCP (p75)

5382 ms

20% good

INP (p75)

272 ms

66% good

CLS (p75)

0.470

44% good

FCP (p75)

3142 ms

TTFB (p75)

573 ms

Image Optimization
7 images, 0 KB total, 0 KB wasted
INFO

Image Optimization Audit

Total Images

7

Total Size

0 KB

7 missing alt text 7 missing dimensions 7 missing lazy loading
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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