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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
69
GRADE
D
FIX
6
REVIEW
2
PASS
7
INFO
2

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

Mobile Desktop
30
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
96
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
77
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.

8.48 s

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

17.48 s

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

1.66 s

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

0.003

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

8.48 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.

17.57 s

Page Load Progression

392 ms
784 ms
1.2 s
1.6 s
2.0 s
2.4 s
2.7 s
3.1 s
Checks
17
7 PASS 2 REVIEW 6 FIX
F
Page Weight Budget
Action
7.0 MB transferred, 167 requests
FIX
7.0 MB transferred, 167 requests
Critical::
Page weighs 12.0 MB (7.0 MB transferred)
Warning::
Images are 5.5 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 5.5 MB
Warning::
JavaScript is 1.1 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.1 MB
Warning::
167 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 1.5 g CO2 per page load
7.0 MB / 2.4 MB budget
7.0 MB transferred
167 requests
1.5 g CO2 per page load
Images 5.5 MiB 78%
JavaScript 1.1 MiB 15%
Other 198.1 KiB 3%
Fonts 137.0 KiB 2%
CSS 87.6 KiB 1%
HTML 7.3 KiB 0%
Other 4.3 KiB 0%
Other 3.6 KiB 0%
Other 1.1 KiB 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

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

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 (7.0 MiB of 7.0 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
8897ms total JS execution
FIX
8897ms total JS execution
Warning::
https://www.channel4.com/homepage/static/2.1.47/js...: 3462ms CPU time
Warning::
https://cdn.optimizely.com/js/8171642667.js: 1231ms CPU time
Warning::
https://www.channel4.com/hEtR9X5wZ/joG_KTcx/ru42TW...: 1042ms CPU time
Warning::
Unattributable: 997ms CPU time
Warning::
https://all4nav.channel4.com/v1/js/loader.js?fullN...: 728ms CPU time
Warning::
Third-party scripts: 8897ms (100% of total)

Main Thread Breakdown

Script Evaluation 62% Other 17% Style & Layout 9% Script Parsing & Compilation 6%
ScriptTotalScriptingParse/CompileParty
https://www.channel4.com/homepage/static/2.1.47/js/homepage.js3462ms2495ms183ms3rd
https://cdn.optimizely.com/js/8171642667.js1231ms674ms71ms3rd
https://www.channel4.com/hEtR9X5wZ/joG_KTcx/ru42TWYm/I0/5Y1iDpfc4tJzkf9c/H0YtIFFvSg/UwR/bfnNaAwMC1042ms871ms76ms3rd
Unattributable997ms162ms0ms3rd
https://all4nav.channel4.com/v1/js/loader.js?fullNav=yes&header=header&footer=footer&parentalControls=yes&all4Footer=yes728ms515ms79ms3rd
https://s.go-mpulse.net/boomerang/XF74S-NBRPP-BVVGB-BSCMM-3V6RK295ms61ms30ms3rd
https://www.channel4.com/278ms37ms5ms3rd
https://static.channel4.com/all4-dtm/latest/dtm.js169ms136ms23ms3rd
https://www.channel4.com/consent/static/2.1.20/renderer.f21543f785a782a39cdc.js162ms130ms13ms3rd
https://et.channel4.com/tags/js/v2/eu1-785e164941c9ed4880842cc0c6d6bf0c/mparticle.js?env=0&plan_id=main_data_plan&plan_version=1142ms111ms29ms3rd

Showing top 10 of 15 scripts

F
JS Bundles
Action
26 scripts, 382 KB unused
FIX
26 scripts, 382 KB unused
Warning::
https://www.channel4.com/homepage/static/2.1.47/js...: 156 KB unused (51%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://all4nav.channel4.com/v1/js/loader.js?fullN...: 70 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.optimizely.com/js/8171642667.js: 53 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.optimizely.com/js/8171642667.js: unminified — 20 KB could be saved
Warning::
https://www.channel4.com/hEtR9X5wZ/joG_KTcx/ru42TW...: 37 KB unused (21%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://s.go-mpulse.net/boomerang/XF74S-NBRPP-BVVG...: 36 KB unused (65%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 382 KB
382 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.channel4.com/homepage/static/2.1.47/js/homepage.js304 KB156 KB (51%)✓3rd
https://all4nav.channel4.com/v1/js/loader.js?fullNav=yes&header=header&footer=footer&parentalControls=yes&all4Footer=yes177 KB70 KB (40%)✓3rd
https://cdn.optimizely.com/js/8171642667.js135 KB53 KB (40%)✗3rd
https://www.channel4.com/hEtR9X5wZ/joG_KTcx/ru42TWYm/I0/5Y1iDpfc4tJzkf9c/H0YtIFFvSg/UwR/bfnNaAwMC181 KB37 KB (21%)✓3rd
https://s.go-mpulse.net/boomerang/XF74S-NBRPP-BVVGB-BSCMM-3V6RK56 KB36 KB (65%)✓3rd
https://et.channel4.com/tags/js/v2/eu1-785e164941c9ed4880842cc0c6d6bf0c/mparticle.js?env=0&plan_id=main_data_plan&plan_version=158 KB29 KB (50%)✓3rd
https://snippet.maze.co/static/2e79a818eb83f241d166a0059110532bffe3227e/contextualScaffold.js7 KB—✓3rd
https://www.channel4.com/consent/static/2.1.20/requester.a95a5ac4c01b2d2253a3.js7 KB—✓3rd
https://static.c4assets.com/all4-ad-code/latest/adverts.js6 KB—✓3rd
https://snippet.maze.co/maze-universal-loader.js?apiKey=4f48c7e5-f420-4f3d-8fcf-810a018b62d43 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

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
167 resources · 7.0 MB · 382 KB savings available
FIX
167 resources · 7.0 MB · 382 KB savings available
Warning::
Page weight 6.0 MB over 1MB target
Got: 7.0 MB Expected: ≤ 1 MB
Info::
~382 KB of savings available
Warning::
166 third-party resources (100% of weight)
Info::
1 resources over 200KB
167 resources · 7.0 MiB · 166 third-party 6.0 MiB over 1MB target
Image 78% · 5.5 MiB
JavaScript 15% · 1.1 MiB
Other 3% · 202.8 KiB
Font 2% · 137.0 KiB
CSS 1% · 87.6 KiB
Document 0% · 7.4 KiB

~381.9 KiB of savings available

Remove unused JavaScript: 381.9 KiB
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.

C
Image Optimization
Action
97 images, 0 KB saveable
REVIEW
97 images, 0 KB saveable
Warning::
https://all4nav.channel4.com/globalnav/static/2.1.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://ic.c4assets.com/bips/159381/44CD9E43-00D4-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://all4nav.channel4.com/globalnav/static/2.1.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://all4nav.channel4.com/globalnav/static/2.1.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://ic.c4assets.com/bips/159381/23964E91-3A84-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
97 images 5.5 MB
0 oversized -0 KB
13 legacy format
5 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

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

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

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
6 fonts (137 KB)
PASS
6 fonts (137 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

137 KB total

Render-blocking

0

of 6

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 12.0 s 14.0 s 16.0 s 18.0 s FCP 8.5 s LCP 17.5 shttps://www.channel4.com/staticfonts/latest/4text.regular/punctuation.woffpunctuation.woff https://www.channel4.com/staticfonts/latest/4text.regular/punctuation.woff — 22.1 KiB — 359 ms — font-display: swaphttps://www.channel4.com/staticfonts/latest/c4.text/punctuation.woffpunctuation.woff https://www.channel4.com/staticfonts/latest/c4.text/punctuation.woff — 32.4 KiB — 512 ms — font-display: swaphttps://www.channel4.com/staticfonts/latest/c4.headline/punctuation.woffpunctuation.woff https://www.channel4.com/staticfonts/latest/c4.headline/punctuation.woff — 28.9 KiB — 488 ms — font-display: swaphttps://www.channel4.com/staticfonts/latest/4text.medium/lowercase.wofflowercase.woff https://www.channel4.com/staticfonts/latest/4text.medium/lowercase.woff — 22.4 KiB — 306 ms — font-display: swaphttps://all4nav.channel4.com/globalnav/static/2.1.34/fonts/fouricons_v2_3..wofffouricons_v2_3..woff https://all4nav.channel4.com/globalnav/static/2.1.34/fonts/fouricons_v2_3..woff — 8.8 KiB — 19 ms — font-display: swaphttps://www.channel4.com/staticfonts/latest/4text.medium/punctuation.woffpunctuation.woff https://www.channel4.com/staticfonts/latest/4text.medium/punctuation.woff — 22.4 KiB — 363 ms — font-display: swap
punctuation.woff woff swap
Size 22 KB
Load time 359 ms
Start 897 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
punctuation.woff woff swap
Size 32 KB
Load time 512 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
punctuation.woff woff swap
Size 29 KB
Load time 488 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
lowercase.woff woff swap
Size 22 KB
Load time 306 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
fouricons_v2_3..woff woff swap
Size 9 KB
Load time 19 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
punctuation.woff woff swap
Size 22 KB
Load time 363 ms
Start 1.3 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 ~41 KB and ~82 ms

A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
Network Waterfall
167 requests over 2973ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s FCP 8.5 s LCP 17.5 shttps://channel4.com// https://channel4.com/ — 301 — 86 B — 249 ms — h2https://www.channel4.com/www.channel4.com/ https://www.channel4.com/ — 200 — 7.3 KiB — 133 ms — h2https://static.channel4.com/all4-dtm/latest/dtm.jsstatic.channel4.com/all4-dtm/latest... https://static.channel4.com/all4-dtm/latest/dtm.js — 200 — 46.5 KiB — 538 ms — http/1.1https://cdn.optimizely.com/js/8171642667.jscdn.optimizely.com/js/8171642667.js https://cdn.optimizely.com/js/8171642667.js — 200 — 134.7 KiB — 47 ms — h2https://fonts.channel4.com/stylesheet?4text.regular&4text.medium&4headline.extrabolditalicfonts.channel4.com/stylesheet?4text... https://fonts.channel4.com/stylesheet?4text.regular&4text.medium&4headline.extrabolditalic — 200 — 692 B — 37 ms — http/1.1https://www.channel4.com/homepage/static/2.1.47/css/style.csswww.channel4.com/homepage/static/2.... https://www.channel4.com/homepage/static/2.1.47/css/style.css — 200 — 46.7 KiB — 42 ms — h2https://www.channel4.com/homepage/static/2.1.47/js/homepage.jswww.channel4.com/homepage/static/2.... https://www.channel4.com/homepage/static/2.1.47/js/homepage.js — 200 — 304.2 KiB — 43 ms — h2https://www.channel4.com/hEtR9X5wZ/joG_KTcx/ru42TWYm/I0/5Y1iDpfc4tJzkf9c/H0YtIFFvSg/UwR/bfnNaAwMCwww.channel4.com/hEtR9X5wZ/joG_KTcx... https://www.channel4.com/hEtR9X5wZ/joG_KTcx/ru42TWYm/I0/5Y1iDpfc4tJzkf9c/H0YtIFFvSg/UwR/bfnNaAwMC — 200 — 181.1 KiB — 44 ms — h2https://all4nav.channel4.com/v1/js/loader.js?fullNav=yes&header=header&footer=footer&parentalControls=yes&all4Footer=yesall4nav.channel4.com/v1/js/loader.j... https://all4nav.channel4.com/v1/js/loader.js?fullNav=yes&header=header&footer=footer&parentalControls=yes&all4Footer=yes — 200 — 177.0 KiB — 340 ms — http/1.1https://s.go-mpulse.net/boomerang/XF74S-NBRPP-BVVGB-BSCMM-3V6RKs.go-mpulse.net/boomerang/XF74S-NBR... https://s.go-mpulse.net/boomerang/XF74S-NBRPP-BVVGB-BSCMM-3V6RK — 200 — 56.1 KiB — 29 ms — h2https://static.c4assets.com/all4-ad-code/latest/adverts.jsstatic.c4assets.com/all4-ad-code/la... https://static.c4assets.com/all4-ad-code/latest/adverts.js — 200 — 6.0 KiB — 14 ms — http/1.1https://cdn-pci.optimizely.com/js/geo4.jscdn-pci.optimizely.com/js/geo4.js https://cdn-pci.optimizely.com/js/geo4.js — 200 — 512 B — 42 ms — h2https://et.channel4.com/tags/js/v2/eu1-785e164941c9ed4880842cc0c6d6bf0c/mparticle.js?env=0&plan_id=main_data_plan&plan_version=1et.channel4.com/tags/js/v2/eu1-785e... https://et.channel4.com/tags/js/v2/eu1-785e164941c9ed4880842cc0c6d6bf0c/mparticle.js?env=0&plan_id=main_data_plan&plan_version=1 — 200 — 58.3 KiB — 25 ms — h2https://www.channel4.com/api/homepage?www.channel4.com/api/homepage? 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https://webstats.channel4.com/b/ss/channel4streaming4od/1/JS-2.27.0-LEWM/s8181001960494?AQB=1&ndh=1&pf=1&t=21%2F3%2F2026%2020%3A55%3A7%202%200&mid=33603909248819827874584568738822988296&aamlh=7&ce=UTF-8&ns=channel4&pageName=c4%3Ahomepage&g=https%3A%2F%2Fwww.channel4.com%2F&c.&event=all4.cookie_consent&version=1.0.0&all4.&action.&general_interaction=all4.action.general_interaction&.action&online_offline=online&platform=channel4dotcom&viewer_guid=not-signed-in&authentication_status=not_signed_in&general_interaction_type=cookie_consent%3Aprompt%3Awelcome&.all4&.c&cc=GBP&pe=lnk_o&pev2=all4.cookie_consent&s=412x823&c=24&j=1.6&v=N&k=Y&bw=412&bh=823&mcorgid=16B222CE527834FC0A490D4D%40AdobeOrg&AQE=1 — 200 — 184 B — 13 ms — h2https://www.channel4.com/identity/whoamiwww.channel4.com/identity/whoami https://www.channel4.com/identity/whoami — 200 — 822 B — 99 ms — h2https://www.channel4.com/identity/whoamiwww.channel4.com/identity/whoami https://www.channel4.com/identity/whoami — 200 — 824 B — 197 ms — h2https://www.channel4.com/identity/whoamiwww.channel4.com/identity/whoami https://www.channel4.com/identity/whoami — 200 — 827 B — 293 ms — h2https://www.channel4.com/identity/whoamiwww.channel4.com/identity/whoami https://www.channel4.com/identity/whoami — 200 — 822 B — 386 ms — h2https://prompts.maze.co/api/widgetsprompts.maze.co/api/widgets https://prompts.maze.co/api/widgets — 204 — 0 B — 28 ms — h2https://prompts.maze.co/api/widgetsprompts.maze.co/api/widgets https://prompts.maze.co/api/widgets — 200 — 156 B — 28 ms — h2blob:https://www.channel4.com/47e14325-e572-44ab-88ea-acdc1d2e9ecdwww.channel4.com/47e14325-e572-44ab... blob:https://www.channel4.com/47e14325-e572-44ab-88ea-acdc1d2e9ecd — -1 — 0 B — 0 ms — https://static.c4assets.com/all4-dtm/latest/b8b3c372794b/RC0215f20884cf4ddcabe4edd10b9bb998-source.jsstatic.c4assets.com/all4-dtm/latest... https://static.c4assets.com/all4-dtm/latest/b8b3c372794b/RC0215f20884cf4ddcabe4edd10b9bb998-source.js — 200 — 877 B — 9 ms — http/1.1https://static.c4assets.com/all4-dtm/latest/b8b3c372794b/RC1ccad7261ae1404ba561eefcbb949484-source.jsstatic.c4assets.com/all4-dtm/latest... https://static.c4assets.com/all4-dtm/latest/b8b3c372794b/RC1ccad7261ae1404ba561eefcbb949484-source.js — 200 — 1.1 KiB — 10 ms — http/1.1https://webstats.channel4.com/b/ss/channel4streaming4od/1/JS-2.27.0-LEWM/s83235242596266?AQB=1&ndh=1&pf=1&t=21%2F3%2F2026%2020%3A55%3A8%202%200&mid=33603909248819827874584568738822988296&aamlh=7&ce=UTF-8&ns=channel4&pageName=c4%3Ahomepage&g=https%3A%2F%2Fwww.channel4.com%2F&cc=GBP&ch=channel4.com&server=www.channel4.com&aamb=6G1ynYcLPuiQxYZrsz_pkqfLG9yMXBpb2zX5dvJdYQJzPXImdj0y&c1=D%3Dv1&v1=c4&c2=D%3Dv2&v2=c4%3Ahomepage&c3=D%3Dv3&v3=c4%3Ahomepage&c6=D%3Dv6&c11=D%3Dv11&c12=D%3Dv12&c16=D%3Dv16&c17=D%3Dv17&c18=D%3Dv18&v18=https%3A%2F%2Fwww.channel4.com%2F&c27=D%3Dv27&v27=channel%204%20%7C%20stream%20%26%20watch%20live%20tv&c34=D%3Dv34&v34=not_signed_in&c37=D%3Dv37&v37=not_signed_in&c45=D%3Dv45&c57=D%3Dv57&v57=t0&v76=2026-04-21T20%3A55%3A08.383Z&v77=online&v78=Channel%204%20Main&s=412x823&c=24&j=1.6&v=N&k=Y&bw=412&bh=823&mcorgid=16B222CE527834FC0A490D4D%40AdobeOrg&lrt=82&AQE=1webstats.channel4.com/b/ss/channel4... https://webstats.channel4.com/b/ss/channel4streaming4od/1/JS-2.27.0-LEWM/s83235242596266?AQB=1&ndh=1&pf=1&t=21%2F3%2F2026%2020%3A55%3A8%202%200&mid=33603909248819827874584568738822988296&aamlh=7&ce=UTF-8&ns=channel4&pageName=c4%3Ahomepage&g=https%3A%2F%2Fwww.channel4.com%2F&cc=GBP&ch=channel4.com&server=www.channel4.com&aamb=6G1ynYcLPuiQxYZrsz_pkqfLG9yMXBpb2zX5dvJdYQJzPXImdj0y&c1=D%3Dv1&v1=c4&c2=D%3Dv2&v2=c4%3Ahomepage&c3=D%3Dv3&v3=c4%3Ahomepage&c6=D%3Dv6&c11=D%3Dv11&c12=D%3Dv12&c16=D%3Dv16&c17=D%3Dv17&c18=D%3Dv18&v18=https%3A%2F%2Fwww.channel4.com%2F&c27=D%3Dv27&v27=channel%204%20%7C%20stream%20%26%20watch%20live%20tv&c34=D%3Dv34&v34=not_signed_in&c37=D%3Dv37&v37=not_signed_in&c45=D%3Dv45&c57=D%3Dv57&v57=t0&v76=2026-04-21T20%3A55%3A08.383Z&v77=online&v78=Channel%204%20Main&s=412x823&c=24&j=1.6&v=N&k=Y&bw=412&bh=823&mcorgid=16B222CE527834FC0A490D4D%40AdobeOrg&lrt=82&AQE=1 — 200 — 116 B — 17 ms — h2https://2a7e9.v.fwmrm.net/ad/g/1?resp=smrx&crtp=ptiling&vclr=LinkTag2-v6.11.0-8478dfcb-201609201613&nw=174057&prof=c4_live&csid=www.channel4.com&vcid=;_fw_vcid2=174057:&_fw_cookie_consent=0&_fw_fss=_fw_search&_fw_h_x_flash_version=0%2C0%2C0%2C0;ptgt=s&w=640&h=38&envp=c4_live&slid=c4advert-homepageSponsor&flag=%2Bcmpn&pvrn=960279353370&prct=text%2Fhtml_lit_js_wc_nw2a7e9.v.fwmrm.net/ad/g/1?resp=smrx&... https://2a7e9.v.fwmrm.net/ad/g/1?resp=smrx&crtp=ptiling&vclr=LinkTag2-v6.11.0-8478dfcb-201609201613&nw=174057&prof=c4_live&csid=www.channel4.com&vcid=;_fw_vcid2=174057:&_fw_cookie_consent=0&_fw_fss=_fw_search&_fw_h_x_flash_version=0%2C0%2C0%2C0;ptgt=s&w=640&h=38&envp=c4_live&slid=c4advert-homepageSponsor&flag=%2Bcmpn&pvrn=960279353370&prct=text%2Fhtml_lit_js_wc_nw — 200 — 2.8 KiB — 294 ms — http/1.1https://www.channel4.com/hEtR9X5wZ/joG_KTcx/ru42TWYm/I0/5Y1iDpfc4tJzkf9c/H0YtIFFvSg/UwR/bfnNaAwMCwww.channel4.com/hEtR9X5wZ/joG_KTcx... https://www.channel4.com/hEtR9X5wZ/joG_KTcx/ru42TWYm/I0/5Y1iDpfc4tJzkf9c/H0YtIFFvSg/UwR/bfnNaAwMC — 201 — 1.1 KiB — 181 ms — h2https://ic.c4assets.com/bips/collections/B577486A-7450-47e3-b61e-8e847d65aeeb.jpg?imformat=chrome&resize=500px:*ic.c4assets.com/bips/collections/B5... https://ic.c4assets.com/bips/collections/B577486A-7450-47e3-b61e-8e847d65aeeb.jpg?imformat=chrome&resize=500px:* — 200 — 29.4 KiB — 9 ms — h2https://ic.c4assets.com/bips/collections/C410205C-42E1-41fd-bb48-74b58861bb33.jpg?imformat=chrome&resize=500px:*ic.c4assets.com/bips/collections/C4... https://ic.c4assets.com/bips/collections/C410205C-42E1-41fd-bb48-74b58861bb33.jpg?imformat=chrome&resize=500px:* — 200 — 20.4 KiB — 13 ms — h2https://ic.c4assets.com/bips/collections/1A0581A2-35BB-47ef-80da-f28eae25d0e9.jpg?imformat=chrome&resize=500px:*ic.c4assets.com/bips/collections/1A... https://ic.c4assets.com/bips/collections/1A0581A2-35BB-47ef-80da-f28eae25d0e9.jpg?imformat=chrome&resize=500px:* — 200 — 44.1 KiB — 15 ms — h2https://ic.c4assets.com/bips/collections/08580D8B-3BCE-4eb2-ab99-15b41b831b7d.jpg?imformat=chrome&resize=500px:*ic.c4assets.com/bips/collections/08... https://ic.c4assets.com/bips/collections/08580D8B-3BCE-4eb2-ab99-15b41b831b7d.jpg?imformat=chrome&resize=500px:* — 200 — 25.8 KiB — 18 ms — h2https://logx.optimizely.com/v1/eventslogx.optimizely.com/v1/events https://logx.optimizely.com/v1/events — 204 — 73 B — 24 ms — h2https://www.channel4.com/favicon.svgwww.channel4.com/favicon.svg https://www.channel4.com/favicon.svg — 200 — 819 B — 15 ms — h2https://www.channel4.com/android-chrome-192x192.pngwww.channel4.com/android-chrome-192... https://www.channel4.com/android-chrome-192x192.png — 200 — 1.7 KiB — 24 ms — h2https://www.channel4.com/favicon.icowww.channel4.com/favicon.ico https://www.channel4.com/favicon.ico — 200 — 1.8 KiB — 12 ms — h2
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 8897ms · 883KB · £154/mo
www.channel4.com
Other
Costly
Execution 3462ms
Transfer 304 KB
Unused 51%
Monthly Cost £60/mo
Optimizely
A/B Testing
Costly
Execution 1231ms
Transfer 135 KB
Unused 40%
Monthly Cost £21/mo
www.channel4.com
Other
Costly
Execution 1042ms
Transfer 1 KB
Unused 21%
Monthly Cost £18/mo
Unattributable
Other
Costly
Execution 997ms
Transfer 0 KB
Monthly Cost £17/mo
all4nav.channel4.com
Other
Costly
Execution 728ms
Transfer 177 KB
Unused 40%
Monthly Cost £13/mo
s.go-mpulse.net
Other
Costly
Execution 295ms
Transfer 56 KB
Unused 65%
Monthly Cost £5/mo
www.channel4.com
Other
Costly
Execution 278ms
Transfer 7 KB
Monthly Cost £5/mo
static.channel4.com
Other
Optional
Execution 169ms
Transfer 47 KB
Monthly Cost £3/mo
www.channel4.com
Other
Optional
Execution 162ms
Transfer 3 KB
Monthly Cost £3/mo
et.channel4.com
Other
Optional
Execution 142ms
Transfer 58 KB
Unused 50%
Monthly Cost £2/mo
static.c4assets.com
Other
Optional
Execution 109ms
Transfer 6 KB
Monthly Cost £2/mo
www.channel4.com
Other
Optional
Execution 90ms
Transfer 38 KB
Monthly Cost £2/mo
www.channel4.com
Other
Optional
Execution 89ms
Transfer 39 KB
Monthly Cost £2/mo
cdn-pci.optimizely.com
Other
Optional
Execution 53ms
Transfer 0 KB
Monthly Cost £1/mo
www.channel4.com
Other
Optional
Execution 51ms
Transfer 11 KB
Monthly Cost £1/mo

These scripts may cost more than they're worth

  • www.channel4.com adds 3462ms and costs ~£60/month
  • Optimizely adds 1231ms and costs ~£21/month
  • www.channel4.com adds 1042ms and costs ~£18/month
  • Unattributable adds 997ms and costs ~£17/month
  • all4nav.channel4.com adds 728ms and costs ~£13/month
  • s.go-mpulse.net adds 295ms and costs ~£5/month
  • www.channel4.com adds 278ms and costs ~£5/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.channel4.com takes 3462ms 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

51% of www.channel4.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

Optimizely takes 1231ms 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

www.channel4.com takes 1042ms 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 997ms 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

all4nav.channel4.com takes 728ms 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

s.go-mpulse.net takes 295ms 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

65% of s.go-mpulse.net'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.channel4.com takes 278ms 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

50% of et.channel4.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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