Skip to content
https://blog.youtube

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
84
GRADE
B
FIX
1
REVIEW
6
PASS
6
INFO
2

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

Mobile Desktop
96
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
93
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.

564 ms

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

1.28 s

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

0 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.

940 ms

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

1.28 s

Page Load Progression

430 ms
860 ms
1.3 s
1.7 s
2.1 s
2.6 s
3.0 s
3.4 s
Checks
15
6 PASS 6 REVIEW 1 FIX
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, 43 requests
REVIEW
1.3 MB transferred, 43 requests
Info::
Page weighs 2.4 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::
43 HTTP requests
Info::
Estimated 0.28 g CO2 per page load
1.3 MB / 2.4 MB budget
1.3 MB transferred
43 requests
0.28 g CO2 per page load
Images 664.9 KiB 49%
JavaScript 348.2 KiB 26%
Fonts 237.3 KiB 18%
CSS 45.6 KiB 3%
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
52% third-party, 0 ms blocking
REVIEW
52% third-party, 0 ms blocking
Warning::
Third-party code accounts for 52% of page weight (696.5 KiB of 1.3 MiB)
Info::
Third-party blocking time is low (0 ms)
48%
52%
First-party Third-party
C
Image Optimization
Action
16 images, 0 KB saveable
REVIEW
16 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::
https://storage.googleapis.com/gweb-uniblog-publis... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://storage.googleapis.com/gweb-uniblog-publis... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
16 images 665 KB
0 oversized -0 KB
16 legacy format
3 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

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

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

Source: web.dev / Core Web Vitals

B
JS Execution Cost
572ms total JS execution
REVIEW
572ms total JS execution
Warning::
https://blog.youtube/: 324ms CPU time
Info::
https://blog.youtube/static/youtube/js/6764.343636...: 120ms CPU time
Info::
Unattributable: 76ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-W8L...: 52ms CPU time
Info::
Third-party scripts: 128ms (22% of total)

Main Thread Breakdown

Other 35% Script Evaluation 23% Style & Layout 19% Rendering 17% Script Parsing & Compilation 4%
ScriptTotalScriptingParse/CompileParty
https://blog.youtube/324ms4ms1ms1st
https://blog.youtube/static/youtube/js/6764.343636279b.min.js120ms16ms0ms1st
Unattributable76ms2ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-W8LC8VL52ms42ms10ms3rd
B
JS Bundles
12 scripts, 118 KB unused
REVIEW
12 scripts, 118 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-8LV4...: 62 KB unused (43%)
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: 118 KB
118 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-8LV49FDYJ3&cx=c&gtm=4e64k0h1144 KB62 KB (43%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-W8LC8VL128 KB56 KB (44%)✓3rd
https://blog.youtube/static/blog_youtube/js/csp/gtm.js?version=pr20260415-16383 KB—✓1st
https://blog.youtube/static/youtube/js/all/index.js?version=pr20260415-163822 KB—✓1st
https://www.gstatic.com/glue/cookienotificationbar/cookienotificationbar.min.js28 KB—✓3rd
https://www.gstatic.com/external_hosted/vanillamasonry-v3_1_5/masonry.pkgd.min.js8 KB—✓3rd
https://blog.youtube/static/youtube/js/6764.343636279b.min.js4 KB—✓1st
https://blog.youtube/static/youtube/js/9947.1fac8a60f0.min.js5 KB—✓1st
https://blog.youtube/static/youtube/js/6605.45dbe0e706.min.js4 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
43 resources · 1.3 MB · 118 KB savings available
REVIEW
43 resources · 1.3 MB · 118 KB savings available
Warning::
Page weight 326 KB over 1MB target
Got: 1.3 MB Expected: ≤ 1 MB
Info::
~118 KB of savings available
Warning::
24 third-party resources (52% of weight)
Info::
1 resources over 200KB
43 resources · 1.3 MiB · 24 third-party 325.7 KiB over 1MB target
Image 51% · 690.2 KiB
JavaScript 26% · 348.2 KiB
Font 18% · 237.3 KiB
CSS 3% · 45.6 KiB
Document 2% · 27.7 KiB
Other 0% · 800 B

~117.8 KiB of savings available

Remove unused JavaScript: 117.8 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 500 ms 1.0 s FCP 564 ms LCP 1.3 shttps://blog.youtube/static/youtube/fonts/YouTubeSansMono-SemiBold.woff2YouTubeSansMono-SemiBol... https://blog.youtube/static/youtube/fonts/YouTubeSansMono-SemiBold.woff2 — 34.8 KiB — 70 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 — 68 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 — 85 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 — 91 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 — 73 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 — 91 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 36.7 KiB — 66 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 — 66 ms — font-display: swap
YouTubeSansMono-SemiBol... woff2 swap
Size 35 KB
Load time 70 ms
Start 249 ms
Risk FOUT — text flashes from fallback to web font
YouTubeSans-Black.woff2 woff2 swap
Size 16 KB
Load time 68 ms
Start 249 ms
Risk FOUT — text flashes from fallback to web font
YouTubeSans-Regular.woff2 woff2 swap
Size 16 KB
Load time 85 ms
Start 250 ms
Risk FOUT — text flashes from fallback to web font
YouTubeSansMono-Medium.... woff2 swap
Size 35 KB
Load time 91 ms
Start 250 ms
Risk FOUT — text flashes from fallback to web font
YouTubeSans-Light.woff2 woff2 swap
Size 16 KB
Load time 73 ms
Start 250 ms
Risk FOUT — text flashes from fallback to web font
YouTubeSans-Bold.woff2 woff2 swap
Size 48 KB
Load time 91 ms
Start 250 ms
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 37 KB
Load time 66 ms
Start 434 ms
Risk FOUT — text flashes from fallback to web font
4UasrENHsxJlGDuGo1OIlJf... woff2 swap
Size 35 KB
Load time 66 ms
Start 435 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
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

Network Waterfall
43 requests over 1161ms
INFO
0 ms 500 ms 1.0 s FCP 564 ms LCP 1.3 shttps://blog.youtube// https://blog.youtube/ — 200 — 27.7 KiB — 205 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 — 69 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 — 70 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 — 68 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 — 85 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 — 91 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 — 73 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 — 91 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 — 94 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 — 195 ms — h2https://blog.youtube/static/blog_youtube/videos/bg-hero-desktop.webp?version=pr20260415-1638/static/blog_youtube/videos/bg-hero... https://blog.youtube/static/blog_youtube/videos/bg-hero-desktop.webp?version=pr20260415-1638 — 200 — 352.0 KiB — 109 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 — 521 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 — 37 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 — 112 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 — 116 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 — 443 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 — 524 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 — 2.7 KiB — 521 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 — 538 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 — 518 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 — 534 ms — h2https://storage.googleapis.com/gweb-uniblog-publish-prod/images/Image_20251113_201733.max-100x100.format-webp.webpstorage.googleapis.com/gweb-uniblog... https://storage.googleapis.com/gweb-uniblog-publish-prod/images/Image_20251113_201733.max-100x100.format-webp.webp — 200 — 2.7 KiB — 540 ms — h2https://storage.googleapis.com/gweb-uniblog-publish-prod/images/YT_Series_Scrolled.max-100x100.format-webp.webpstorage.googleapis.com/gweb-uniblog... https://storage.googleapis.com/gweb-uniblog-publish-prod/images/YT_Series_Scrolled.max-100x100.format-webp.webp — 200 — 2.0 KiB — 536 ms — h2https://storage.googleapis.com/gweb-uniblog-publish-prod/images/Screenshot_2025-04-01_at_8.08.4.max-100x100.format-webp.webpstorage.googleapis.com/gweb-uniblog... https://storage.googleapis.com/gweb-uniblog-publish-prod/images/Screenshot_2025-04-01_at_8.08.4.max-100x100.format-webp.webp — 200 — 5.1 KiB — 539 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 — 66 ms — h3https://fonts.gstatic.com/s/googlesans/v67/4UasrENHsxJlGDuGo1OIlJfC6l_24rlCK1Yo_Iqcsih3SAyH6cAwhX9RPjIUvbQoi-E.woff2fonts.gstatic.com/s/googlesans/v67/... https://fonts.gstatic.com/s/googlesans/v67/4UasrENHsxJlGDuGo1OIlJfC6l_24rlCK1Yo_Iqcsih3SAyH6cAwhX9RPjIUvbQoi-E.woff2 — 200 — 35.3 KiB — 66 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 — 161 ms — h2https://blog.youtube/static/blog_youtube/images/icons.svg?version=pr20260415-1638/static/blog_youtube/images/icons.s... https://blog.youtube/static/blog_youtube/images/icons.svg?version=pr20260415-1638 — 200 — 21.8 KiB — 34 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 — 60 ms — h3
0 ms 500 ms 1.0 s FCP 564 ms LCP 1.3 shttps://blog.youtube// https://blog.youtube/ — 200 — 27.7 KiB — 205 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 — 69 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 — 70 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 — 68 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 — 85 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 — 91 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 — 73 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 — 91 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 — 94 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 — 195 ms — h2https://blog.youtube/static/blog_youtube/videos/bg-hero-desktop.webp?version=pr20260415-1638/static/blog_youtube/videos/bg-hero... https://blog.youtube/static/blog_youtube/videos/bg-hero-desktop.webp?version=pr20260415-1638 — 200 — 352.0 KiB — 109 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 — 521 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 — 37 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 — 112 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 — 116 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 — 443 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 — 524 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 — 2.7 KiB — 521 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 — 538 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 — 518 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 — 534 ms — h2https://storage.googleapis.com/gweb-uniblog-publish-prod/images/Image_20251113_201733.max-100x100.format-webp.webpstorage.googleapis.com/gweb-uniblog... https://storage.googleapis.com/gweb-uniblog-publish-prod/images/Image_20251113_201733.max-100x100.format-webp.webp — 200 — 2.7 KiB — 540 ms — h2https://storage.googleapis.com/gweb-uniblog-publish-prod/images/YT_Series_Scrolled.max-100x100.format-webp.webpstorage.googleapis.com/gweb-uniblog... https://storage.googleapis.com/gweb-uniblog-publish-prod/images/YT_Series_Scrolled.max-100x100.format-webp.webp — 200 — 2.0 KiB — 536 ms — h2https://storage.googleapis.com/gweb-uniblog-publish-prod/images/Screenshot_2025-04-01_at_8.08.4.max-100x100.format-webp.webpstorage.googleapis.com/gweb-uniblog... https://storage.googleapis.com/gweb-uniblog-publish-prod/images/Screenshot_2025-04-01_at_8.08.4.max-100x100.format-webp.webp — 200 — 5.1 KiB — 539 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 — 66 ms — h3https://fonts.gstatic.com/s/googlesans/v67/4UasrENHsxJlGDuGo1OIlJfC6l_24rlCK1Yo_Iqcsih3SAyH6cAwhX9RPjIUvbQoi-E.woff2fonts.gstatic.com/s/googlesans/v67/... https://fonts.gstatic.com/s/googlesans/v67/4UasrENHsxJlGDuGo1OIlJfC6l_24rlCK1Yo_Iqcsih3SAyH6cAwhX9RPjIUvbQoi-E.woff2 — 200 — 35.3 KiB — 66 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 — 161 ms — h2https://blog.youtube/static/blog_youtube/images/icons.svg?version=pr20260415-1638/static/blog_youtube/images/icons.s... https://blog.youtube/static/blog_youtube/images/icons.svg?version=pr20260415-1638 — 200 — 21.8 KiB — 34 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 — 60 ms — h3https://www.googletagmanager.com/gtag/js?id=G-8LV49FDYJ3&cx=c&gtm=4e64k0h1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-8LV49FDYJ3&cx=c&gtm=4e64k0h1 — 200 — 144.1 KiB — 62 ms — h2https://region1.google-analytics.com/g/collect?v=2&tid=G-8LV49FDYJ3&gtm=45je64k0h1v870780283z8831695418za20gzb831695418zd831695418&_p=1776894269925&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&_eu=EA&are=1&cid=96836897.1776894270&frm=0&ir=1&pscdl=noapi&rcb=4&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115616985~115938466~115938468~117266400~117512543&dl=https%3A%2F%2Fblog.youtube%2F&sid=1776894270&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=775region1.google-analytics.com/g/coll... https://region1.google-analytics.com/g/collect?v=2&tid=G-8LV49FDYJ3&gtm=45je64k0h1v870780283z8831695418za20gzb831695418zd831695418&_p=1776894269925&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&_eu=EA&are=1&cid=96836897.1776894270&frm=0&ir=1&pscdl=noapi&rcb=4&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115616985~115938466~115938468~117266400~117512543&dl=https%3A%2F%2Fblog.youtube%2F&sid=1776894270&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=775 — 204 — 547 B — 91 ms — h2https://blog.youtube/static/blog_youtube/images/favicon.ico?version=pr20260415-1638/static/blog_youtube/images/favicon... https://blog.youtube/static/blog_youtube/images/favicon.ico?version=pr20260415-1638 — 200 — 3.4 KiB — 34 ms — h2https://blog.youtube/static/youtube/js/6764.343636279b.min.js/static/youtube/js/6764.343636279b.... https://blog.youtube/static/youtube/js/6764.343636279b.min.js — 200 — 3.9 KiB — 37 ms — h2https://blog.youtube/static/youtube/js/9947.1fac8a60f0.min.js/static/youtube/js/9947.1fac8a60f0.... https://blog.youtube/static/youtube/js/9947.1fac8a60f0.min.js — 200 — 5.0 KiB — 39 ms — h2https://blog.youtube/static/youtube/js/6605.45dbe0e706.min.js/static/youtube/js/6605.45dbe0e706.... https://blog.youtube/static/youtube/js/6605.45dbe0e706.min.js — 200 — 3.5 KiB — 39 ms — h2https://storage.googleapis.com/gweb-uniblog-publish-prod/images/emea-news-summit-london-2026-6.width-800.format-webp.webpstorage.googleapis.com/gweb-uniblog... https://storage.googleapis.com/gweb-uniblog-publish-prod/images/emea-news-summit-london-2026-6.width-800.format-webp.webp — 200 — 33.4 KiB — 134 ms — h2https://blog.youtube/static/youtube/js/7483.d6bac88413.min.js/static/youtube/js/7483.d6bac88413.... https://blog.youtube/static/youtube/js/7483.d6bac88413.min.js — 200 — 909 B — 36 ms — h2https://blog.youtube/static/youtube/js/6217.cba3f1adcd.min.js/static/youtube/js/6217.cba3f1adcd.... https://blog.youtube/static/youtube/js/6217.cba3f1adcd.min.js — 200 — 371 B — 38 ms — h2https://blog.youtube/static/youtube/js/4876.eb071c3d09.min.js/static/youtube/js/4876.eb071c3d09.... https://blog.youtube/static/youtube/js/4876.eb071c3d09.min.js — 200 — 2.6 KiB — 37 ms — h2https://storage.googleapis.com/gweb-uniblog-publish-prod/images/youtube-kids-account-login.width-800.format-webp.webpstorage.googleapis.com/gweb-uniblog... https://storage.googleapis.com/gweb-uniblog-publish-prod/images/youtube-kids-account-login.width-800.format-webp.webp — 200 — 14.6 KiB — 153 ms — h3https://storage.googleapis.com/gweb-uniblog-publish-prod/images/109ee0e8-7173-44cd-b168-1cc239276.width-800.format-webp.webpstorage.googleapis.com/gweb-uniblog... https://storage.googleapis.com/gweb-uniblog-publish-prod/images/109ee0e8-7173-44cd-b168-1cc239276.width-800.format-webp.webp — 200 — 87.5 KiB — 188 ms — h3https://storage.googleapis.com/gweb-uniblog-publish-prod/images/unnamed_10.width-800.format-webp.webpstorage.googleapis.com/gweb-uniblog... https://storage.googleapis.com/gweb-uniblog-publish-prod/images/unnamed_10.width-800.format-webp.webp — 200 — 28.6 KiB — 163 ms — h3
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
22% of JavaScript execution is third-party
First-party Third-party 128ms · 128KB · $2/mo
Unattributable
Other
Optional
Execution 76ms
Transfer 0 KB
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 52ms
Transfer 128 KB
Unused 44%
Monthly Cost $1/mo

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.

Send Feedback