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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
84
GRADE
B
FIX
2
REVIEW
5
PASS
8
INFO
2

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

Mobile Desktop
65
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
90
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.
85
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.

2.85 s

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

9.57 s

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

174 ms

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

0.004

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

4.54 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.

9.64 s

Page Load Progression

483 ms
966 ms
1.4 s
1.9 s
2.4 s
2.9 s
3.4 s
3.9 s
Checks
17
8 PASS 5 REVIEW 2 FIX
D
JS Execution Cost
Action
2371ms total JS execution
FIX
2371ms total JS execution
Warning::
https://blog.youtube/: 1024ms CPU time
Warning::
https://blog.youtube/static/youtube/js/6764.343636...: 415ms CPU time
Warning::
Unattributable: 310ms CPU time
Info::
https://blog.youtube/static/youtube/js/all/index.j...: 222ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-8LV4...: 212ms CPU time
Info::
Third-party scripts: 710ms (30% of total)

Main Thread Breakdown

Other 32% Script Evaluation 28% Style & Layout 19% Rendering 15% Script Parsing & Compilation 4%
ScriptTotalScriptingParse/CompileParty
https://blog.youtube/1024ms15ms2ms1st
https://blog.youtube/static/youtube/js/6764.343636279b.min.js415ms68ms2ms1st
Unattributable310ms7ms0ms3rd
https://blog.youtube/static/youtube/js/all/index.js?version=pr20260415-1638222ms186ms8ms1st
https://www.googletagmanager.com/gtag/js?id=G-8LV49FDYJ3&cx=c&gtm=4e64k0212ms180ms31ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-W8LC8VL188ms152ms34ms3rd
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

B
Page Weight Budget
1.3 MB transferred, 44 requests
REVIEW
1.3 MB transferred, 44 requests
Info::
Page weighs 2.3 MB (1.3 MB transferred)
Info::
Fonts are 237 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 237 KB
Info::
44 HTTP requests
Info::
Estimated 0.26 g CO2 per page load
1.3 MB / 2.4 MB budget
1.3 MB transferred
44 requests
0.26 g CO2 per page load
Images 604.6 KiB 47%
JavaScript 349.4 KiB 27%
Fonts 237.2 KiB 18%
CSS 45.6 KiB 4%
HTML 27.7 KiB 2%
Other 25.3 KiB 2%
Other 800 B 0%
0 2.4 MB 4.9 MB
Under budget

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

B
Third-Party Impact
55% third-party, 0 ms blocking
REVIEW
55% third-party, 0 ms blocking
Warning::
Third-party code accounts for 55% of page weight (708.5 KiB of 1.3 MiB)
Info::
Third-party blocking time is low (0 ms)
45%
55%
First-party Third-party
C
Image Optimization
Action
17 images, 0 KB saveable
REVIEW
17 images, 0 KB saveable
Warning::
https://storage.googleapis.com/gweb-uniblog-publis... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
17 images 605 KB
0 oversized -0 KB
15 legacy format
2 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

B
JS Bundles
13 scripts, 117 KB unused
REVIEW
13 scripts, 117 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-8LV4...: 61 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-W8L...: 56 KB unused (44%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 117 KB
117 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-8LV49FDYJ3&cx=c&gtm=4e64k0144 KB61 KB (42%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-W8LC8VL128 KB56 KB (44%)✓3rd
https://blog.youtube/static/youtube/js/9947.1fac8a60f0.min.js5 KB—✓1st
https://www.gstatic.com/external_hosted/vanillamasonry-v3_1_5/masonry.pkgd.min.js8 KB—✓3rd
https://www.gstatic.com/glue/cookienotificationbar/cookienotificationbar.min.js28 KB—✓3rd
https://blog.youtube/static/youtube/js/all/index.js?version=pr20260415-163822 KB—✓1st
https://blog.youtube/static/blog_youtube/js/csp/gtm.js?version=pr20260415-16383 KB—✓1st
https://blog.youtube/static/youtube/js/8920.1652479294.min.js1 KB—✓1st
https://blog.youtube/static/youtube/js/4876.eb071c3d09.min.js3 KB—✓1st
https://blog.youtube/static/youtube/js/7483.d6bac88413.min.js1 KB—✓1st

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

C
Page Weight Inventory
Action
44 resources · 1.3 MB · 117 KB savings available
REVIEW
44 resources · 1.3 MB · 117 KB savings available
Warning::
Page weight 267 KB over 1MB target
Got: 1.3 MB Expected: ≤ 1 MB
Info::
~117 KB of savings available
Warning::
24 third-party resources (55% of weight)
Info::
1 resources over 200KB
44 resources · 1.3 MiB · 24 third-party 266.6 KiB over 1MB target
Image 49% · 629.9 KiB
JavaScript 27% · 349.4 KiB
Font 18% · 237.2 KiB
CSS 4% · 45.6 KiB
Document 2% · 27.7 KiB
Other 0% · 800 B

~116.8 KiB of savings available

Remove unused JavaScript: 116.8 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+
Font Loading
8 fonts (237 KB)
PASS
8 fonts (237 KB)
Info::
8 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

8

237 KB total

Render-blocking

0

of 8

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 2.9 s LCP 9.6 shttps://blog.youtube/static/youtube/fonts/YouTubeSansMono-SemiBold.woff2YouTubeSansMono-SemiBol... https://blog.youtube/static/youtube/fonts/YouTubeSansMono-SemiBold.woff2 — 34.8 KiB — 83 ms — font-display: swaphttps://blog.youtube/static/youtube/fonts/YouTubeSans-Black.woff2YouTubeSans-Black.woff2 https://blog.youtube/static/youtube/fonts/YouTubeSans-Black.woff2 — 15.7 KiB — 55 ms — font-display: swaphttps://blog.youtube/static/youtube/fonts/YouTubeSans-Regular.woff2YouTubeSans-Regular.woff2 https://blog.youtube/static/youtube/fonts/YouTubeSans-Regular.woff2 — 15.9 KiB — 64 ms — font-display: swaphttps://blog.youtube/static/youtube/fonts/YouTubeSansMono-Medium.woff2YouTubeSansMono-Medium.... https://blog.youtube/static/youtube/fonts/YouTubeSansMono-Medium.woff2 — 34.7 KiB — 80 ms — font-display: swaphttps://blog.youtube/static/youtube/fonts/YouTubeSans-Light.woff2YouTubeSans-Light.woff2 https://blog.youtube/static/youtube/fonts/YouTubeSans-Light.woff2 — 15.6 KiB — 71 ms — font-display: swaphttps://blog.youtube/static/youtube/fonts/YouTubeSans-Bold.woff2YouTubeSans-Bold.woff2 https://blog.youtube/static/youtube/fonts/YouTubeSans-Bold.woff2 — 48.5 KiB — 81 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 36.7 KiB — 42 ms — font-display: swaphttps://fonts.gstatic.com/s/googlesans/v67/4UasrENHsxJlGDuGo1OIlJfC6l_24rlCK1Yo_Iqcsih3SAyH6cAwhX9RPjIUvbQoi-E.woff24UasrENHsxJlGDuGo1OIlJf... https://fonts.gstatic.com/s/googlesans/v67/4UasrENHsxJlGDuGo1OIlJfC6l_24rlCK1Yo_Iqcsih3SAyH6cAwhX9RPjIUvbQoi-E.woff2 — 35.3 KiB — 36 ms — font-display: swap
YouTubeSansMono-SemiBol... woff2 swap
Size 35 KB
Load time 83 ms
Start 265 ms
Risk FOUT — text flashes from fallback to web font
YouTubeSans-Black.woff2 woff2 swap
Size 16 KB
Load time 55 ms
Start 265 ms
Risk FOUT — text flashes from fallback to web font
YouTubeSans-Regular.woff2 woff2 swap
Size 16 KB
Load time 64 ms
Start 268 ms
Risk FOUT — text flashes from fallback to web font
YouTubeSansMono-Medium.... woff2 swap
Size 35 KB
Load time 80 ms
Start 268 ms
Risk FOUT — text flashes from fallback to web font
YouTubeSans-Light.woff2 woff2 swap
Size 16 KB
Load time 71 ms
Start 268 ms
Risk FOUT — text flashes from fallback to web font
YouTubeSans-Bold.woff2 woff2 swap
Size 48 KB
Load time 81 ms
Start 268 ms
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 37 KB
Load time 42 ms
Start 447 ms
Risk FOUT — text flashes from fallback to web font
4UasrENHsxJlGDuGo1OIlJf... woff2 swap
Size 35 KB
Load time 36 ms
Start 801 ms
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
14 hints, 0 missing preconnects
PASS
14 hints, 0 missing preconnects
Info::
Page uses 14 resource hint(s)

Current Resource Hints

preconnect
2
preload
8
dns-prefetch
4
prefetch
—

14 resource hints configured

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

Network Waterfall
44 requests over 1968ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 2.9 s LCP 9.6 shttps://blog.youtube// https://blog.youtube/ — 200 — 27.7 KiB — 218 ms — h2https://blog.youtube/static/youtube/css/homepage/index.min.css?version=pr20260415-1638/static/youtube/css/homepage/index.... https://blog.youtube/static/youtube/css/homepage/index.min.css?version=pr20260415-1638 — 200 — 42.2 KiB — 48 ms — h2https://blog.youtube/static/youtube/fonts/YouTubeSansMono-SemiBold.woff2/static/youtube/fonts/YouTubeSansMo... https://blog.youtube/static/youtube/fonts/YouTubeSansMono-SemiBold.woff2 — 200 — 34.8 KiB — 83 ms — h2https://blog.youtube/static/youtube/fonts/YouTubeSans-Black.woff2/static/youtube/fonts/YouTubeSans-B... https://blog.youtube/static/youtube/fonts/YouTubeSans-Black.woff2 — 200 — 15.7 KiB — 55 ms — h2https://blog.youtube/static/youtube/fonts/YouTubeSans-Regular.woff2/static/youtube/fonts/YouTubeSans-R... https://blog.youtube/static/youtube/fonts/YouTubeSans-Regular.woff2 — 200 — 15.9 KiB — 64 ms — h2https://blog.youtube/static/youtube/fonts/YouTubeSansMono-Medium.woff2/static/youtube/fonts/YouTubeSansMo... https://blog.youtube/static/youtube/fonts/YouTubeSansMono-Medium.woff2 — 200 — 34.7 KiB — 80 ms — h2https://blog.youtube/static/youtube/fonts/YouTubeSans-Light.woff2/static/youtube/fonts/YouTubeSans-L... https://blog.youtube/static/youtube/fonts/YouTubeSans-Light.woff2 — 200 — 15.6 KiB — 71 ms — h2https://blog.youtube/static/youtube/fonts/YouTubeSans-Bold.woff2/static/youtube/fonts/YouTubeSans-B... https://blog.youtube/static/youtube/fonts/YouTubeSans-Bold.woff2 — 200 — 48.5 KiB — 81 ms — h2https://fonts.googleapis.com/css2?family=Google+Sans:wght@400;500&family=Product+Sans&family=Roboto:wght@100;300;400;500;700&display=swap&lang=enfonts.googleapis.com/css2?family=Go... https://fonts.googleapis.com/css2?family=Google+Sans:wght@400;500&family=Product+Sans&family=Roboto:wght@100;300;400;500;700&display=swap&lang=en — 200 — 3.4 KiB — 100 ms — h2https://storage.googleapis.com/gweb-uniblog-publish-prod/images/YOUTUBE_BLOG_-_NEAL_S_LETTER_SQ.max-900x600.format-webp.webpstorage.googleapis.com/gweb-uniblog... https://storage.googleapis.com/gweb-uniblog-publish-prod/images/YOUTUBE_BLOG_-_NEAL_S_LETTER_SQ.max-900x600.format-webp.webp — 200 — 23.6 KiB — 141 ms — h2https://blog.youtube/static/blog_youtube/videos/bg-hero-mobile.webp?version=pr20260415-1638/static/blog_youtube/videos/bg-hero... https://blog.youtube/static/blog_youtube/videos/bg-hero-mobile.webp?version=pr20260415-1638 — 200 — 279.6 KiB — 95 ms — h2https://storage.googleapis.com/gweb-uniblog-publish-prod/original_videos/wagtailvideo-3na0ulwy_thumb.jpgstorage.googleapis.com/gweb-uniblog... https://storage.googleapis.com/gweb-uniblog-publish-prod/original_videos/wagtailvideo-3na0ulwy_thumb.jpg — 200 — 59.2 KiB — 75 ms — h2https://blog.youtube/static/blog_youtube/js/csp/gtm.js?version=pr20260415-1638/static/blog_youtube/js/csp/gtm.js?... https://blog.youtube/static/blog_youtube/js/csp/gtm.js?version=pr20260415-1638 — 200 — 3.0 KiB — 37 ms — h2https://blog.youtube/static/youtube/js/all/index.js?version=pr20260415-1638/static/youtube/js/all/index.js?ver... https://blog.youtube/static/youtube/js/all/index.js?version=pr20260415-1638 — 200 — 21.6 KiB — 38 ms — h2https://www.gstatic.com/glue/cookienotificationbar/cookienotificationbar.min.jswww.gstatic.com/glue/cookienotifica... https://www.gstatic.com/glue/cookienotificationbar/cookienotificationbar.min.js — 200 — 27.8 KiB — 110 ms — h2https://www.gstatic.com/external_hosted/vanillamasonry-v3_1_5/masonry.pkgd.min.jswww.gstatic.com/external_hosted/van... https://www.gstatic.com/external_hosted/vanillamasonry-v3_1_5/masonry.pkgd.min.js — 200 — 7.7 KiB — 114 ms — h2https://storage.googleapis.com/gweb-uniblog-publish-prod/images/emea-news-summit-london-2026-6.max-100x100.format-webp.webpstorage.googleapis.com/gweb-uniblog... https://storage.googleapis.com/gweb-uniblog-publish-prod/images/emea-news-summit-london-2026-6.max-100x100.format-webp.webp — 200 — 2.1 KiB — 35 ms — h2https://storage.googleapis.com/gweb-uniblog-publish-prod/images/youtube-kids-account-login.max-100x100.format-webp.webpstorage.googleapis.com/gweb-uniblog... https://storage.googleapis.com/gweb-uniblog-publish-prod/images/youtube-kids-account-login.max-100x100.format-webp.webp — 200 — 1.4 KiB — 32 ms — h2https://storage.googleapis.com/gweb-uniblog-publish-prod/images/109ee0e8-7173-44cd-b168-1cc2392.max-100x100.format-webp.webpstorage.googleapis.com/gweb-uniblog... https://storage.googleapis.com/gweb-uniblog-publish-prod/images/109ee0e8-7173-44cd-b168-1cc2392.max-100x100.format-webp.webp — 200 — 2.8 KiB — 35 ms — h2https://storage.googleapis.com/gweb-uniblog-publish-prod/images/unnamed_10.max-100x100.format-webp_uYJKYrM.webpstorage.googleapis.com/gweb-uniblog... https://storage.googleapis.com/gweb-uniblog-publish-prod/images/unnamed_10.max-100x100.format-webp_uYJKYrM.webp — 200 — 1.9 KiB — 36 ms — h2https://storage.googleapis.com/gweb-uniblog-publish-prod/images/unnamed_1_vlyehPF.max-100x100.format-webp.webpstorage.googleapis.com/gweb-uniblog... https://storage.googleapis.com/gweb-uniblog-publish-prod/images/unnamed_1_vlyehPF.max-100x100.format-webp.webp — 200 — 2.5 KiB — 37 ms — h2https://storage.googleapis.com/gweb-uniblog-publish-prod/images/Slice_Joint.max-900x600.format-webp.webpstorage.googleapis.com/gweb-uniblog... https://storage.googleapis.com/gweb-uniblog-publish-prod/images/Slice_Joint.max-900x600.format-webp.webp — 200 — 45.7 KiB — 43 ms — h2https://storage.googleapis.com/gweb-uniblog-publish-prod/original_videos/wagtailvideo-oigzjb5l_thumb.jpgstorage.googleapis.com/gweb-uniblog... https://storage.googleapis.com/gweb-uniblog-publish-prod/original_videos/wagtailvideo-oigzjb5l_thumb.jpg — 200 — 51.1 KiB — 537 ms — h2https://storage.googleapis.com/gweb-uniblog-publish-prod/images/YT-Motion-Desktop.max-900x600.format-webp.webpstorage.googleapis.com/gweb-uniblog... https://storage.googleapis.com/gweb-uniblog-publish-prod/images/YT-Motion-Desktop.max-900x600.format-webp.webp — 200 — 43.3 KiB — 558 ms — h2https://i.ytimg.com/vi_webp/m3kR2KK8TEs/maxresdefault.webpi.ytimg.com/vi_webp/m3kR2KK8TEs/max... https://i.ytimg.com/vi_webp/m3kR2KK8TEs/maxresdefault.webp — 200 — 61.5 KiB — 152 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 — 42 ms — h3https://www.googletagmanager.com/gtm.js?id=GTM-W8LC8VLwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-W8LC8VL — 200 — 127.8 KiB — 165 ms — h2https://www.gstatic.com/glue/cookienotificationbar/config/2b.json?hl=enwww.gstatic.com/glue/cookienotifica... https://www.gstatic.com/glue/cookienotificationbar/config/2b.json?hl=en — 200 — 253 B — 58 ms — h3https://www.googletagmanager.com/gtag/js?id=G-8LV49FDYJ3&cx=c&gtm=4e64k0www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-8LV49FDYJ3&cx=c&gtm=4e64k0 — 200 — 144.0 KiB — 64 ms — h2https://region1.google-analytics.com/g/collect?v=2&tid=G-8LV49FDYJ3&gtm=45je64k0v870780283z8831695418za20gzb831695418zd831695418&_p=1776894255027&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&_eu=EA&are=1&cid=1113555230.1776894255&frm=0&ir=1&pscdl=noapi&rcb=11&sr=412x823&uaa=&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115616985~115938465~115938468~117266400~117512543~117884344&dl=https%3A%2F%2Fblog.youtube%2F&sid=1776894255&sct=1&seg=0&dt=Official%20YouTube%20Blog%20for%20Latest%20YouTube%20News%20%26%20Insights&en=page_view&_fv=1&_nsi=1&_ss=1&ep.page_locale=en-us&ep.page_name=blog_youtube%20%7C%20YouTube%20Homepage&ep.page_template=blog_youtube%20%7C%20YouTube%20Homepage&ep.content_category=YouTube%20Official%20Blog&ep.content_type=blog_youtube%20%7C%20YouTube%20Homepage&epn.num_videos=0&ep.percent_scrolled=0&ep.scroll_increment=0&ep.scroll_instance=1&tfd=789region1.google-analytics.com/g/coll... 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— h2
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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
30% of JavaScript execution is third-party
First-party Third-party 710ms · 272KB · $9/mo
Unattributable
Other
Costly
Execution 310ms
Transfer 0 KB
Monthly Cost $4/mo
Google Tag Manager
Tag Manager
Costly
Execution 212ms
Transfer 144 KB
Unused 42%
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Optional
Execution 188ms
Transfer 128 KB
Unused 44%
Monthly Cost $2/mo

These scripts may cost more than they're worth

  • Unattributable adds 310ms and costs ~$4/month
  • Google Tag Manager adds 212ms and costs ~$3/month

Unattributable takes 310ms 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

Google Tag Manager takes 212ms 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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