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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
69
GRADE
D
FIX
5
REVIEW
3
PASS
5
INFO
2

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

Mobile Desktop
60
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.

1.45 s

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

3.65 s

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

257 ms

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

0.018

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

2.79 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.

3.66 s

Page Load Progression

375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 s
Checks
15
5 PASS 3 REVIEW 5 FIX
F
Page Weight Budget
Action
4.7 MB transferred, 128 requests
FIX
4.7 MB transferred, 128 requests
Critical::
Page weighs 9.7 MB (4.7 MB transferred)
Warning::
Images are 3.2 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 3.2 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::
128 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.98 g CO2 per page load
4.7 MB / 2.4 MB budget
4.7 MB transferred
128 requests
0.98 g CO2 per page load
Images 3.2 MiB 68%
JavaScript 1.1 MiB 23%
Other 198.1 KiB 4%
Fonts 138.6 KiB 3%
CSS 87.6 KiB 2%
HTML 7.3 KiB 0%
Other 4.3 KiB 0%
Other 3.3 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 (4.7 MiB of 4.7 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Bundles
Action
26 scripts, 381 KB unused
FIX
26 scripts, 381 KB unused
Warning::
https://www.channel4.com/homepage/static/2.1.47/js...: 155 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: 54 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: 381 KB
381 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.channel4.com/homepage/static/2.1.47/js/homepage.js304 KB155 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 KB54 KB (40%)✗3rd
https://www.channel4.com/hEtR9X5wZ/joG_KTcx/ru42TWYm/I0/5Y1iDpfc4tJzkf9c/H0YtIFFvSg/UwR/bfnNaAwMC178 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-dtm/latest/b8b3c372794b/hostedLibFiles/EP8757b503532a44a68eee17773f6f10a0/AppMeasurement_Module_ActivityMap.js2 KB—✓3rd
https://cdn-pci.optimizely.com/js/geo4.js0 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
128 resources · 4.7 MB · 381 KB savings available
FIX
128 resources · 4.7 MB · 381 KB savings available
Warning::
Page weight 3.7 MB over 1MB target
Got: 4.7 MB Expected: ≤ 1 MB
Info::
~381 KB of savings available
Warning::
127 third-party resources (100% of weight)
Info::
1 resources over 200KB
128 resources · 4.7 MiB · 127 third-party 3.7 MiB over 1MB target
Image 68% · 3.2 MiB
JavaScript 23% · 1.1 MiB
Other 4% · 202.5 KiB
Font 3% · 138.6 KiB
CSS 2% · 87.6 KiB
Document 0% · 7.4 KiB

~381.4 KiB of savings available

Remove unused JavaScript: 381.4 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
57 images, 0 KB saveable
REVIEW
57 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/159381/23964E91-3A84-... 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/159381/44CD9E43-00D4-... 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.
57 images 3.2 MB
0 oversized -0 KB
12 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
JS Execution Cost
Action
1978ms total JS execution
REVIEW
1978ms total JS execution
Warning::
https://www.channel4.com/homepage/static/2.1.47/js...: 896ms CPU time
Info::
https://www.channel4.com/hEtR9X5wZ/joG_KTcx/ru42TW...: 227ms CPU time
Info::
https://cdn.optimizely.com/js/8171642667.js: 221ms CPU time
Info::
Unattributable: 203ms CPU time
Info::
https://all4nav.channel4.com/v1/js/loader.js?fullN...: 172ms CPU time
Warning::
Third-party scripts: 1978ms (100% of total)

Main Thread Breakdown

Script Evaluation 65% Other 15% Style & Layout 9% Script Parsing & Compilation 7%
ScriptTotalScriptingParse/CompileParty
https://www.channel4.com/homepage/static/2.1.47/js/homepage.js896ms671ms46ms3rd
https://www.channel4.com/hEtR9X5wZ/joG_KTcx/ru42TWYm/I0/5Y1iDpfc4tJzkf9c/H0YtIFFvSg/UwR/bfnNaAwMC227ms202ms18ms3rd
https://cdn.optimizely.com/js/8171642667.js221ms155ms19ms3rd
Unattributable203ms34ms0ms3rd
https://all4nav.channel4.com/v1/js/loader.js?fullNav=yes&header=header&footer=footer&parentalControls=yes&all4Footer=yes172ms119ms22ms3rd
https://www.channel4.com/143ms10ms1ms3rd
https://static.channel4.com/all4-dtm/latest/dtm.js59ms49ms7ms3rd
https://www.channel4.com/consent/static/2.1.20/359.a606b1e83717ef7d245c.js57ms48ms4ms3rd
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
7 fonts (139 KB)
PASS
7 fonts (139 KB)
Info::
7 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

7

139 KB total

Render-blocking

0

of 7

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s FCP 1.4 s LCP 3.7 shttps://www.channel4.com/staticfonts/latest/4text.regular/punctuation.woffpunctuation.woff https://www.channel4.com/staticfonts/latest/4text.regular/punctuation.woff — 22.1 KiB — 458 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 — 430 ms — font-display: swaphttps://www.channel4.com/staticfonts/latest/c4.headline/punctuation.woffpunctuation.woff https://www.channel4.com/staticfonts/latest/c4.headline/punctuation.woff — 28.8 KiB — 377 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 — 299 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 — 25 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 — 330 ms — font-display: swapdata:application/font-woff;charset=utf-8;base64, d09GRgABAAAAAAZgABAAAAAADAAAAAAAAAAAAAAAAAAAAAAAAA…font-woff;charset=utf-8... data:application/font-woff;charset=utf-8;base64, d09GRgABAAAAAAZgABAAAAAADAAAAAAAAAAAAAAAAAAAAAAAAA… — 1.6 KiB — 162 ms — font-display: swap
punctuation.woff woff swap
Size 22 KB
Load time 458 ms
Start 791 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 430 ms
Start 1.4 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 377 ms
Start 1.4 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 299 ms
Start 1.5 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 25 ms
Start 1.5 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 330 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
font-woff;charset=utf-8... woff swap
Size 2 KB
Load time 162 ms
Start 1.7 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 ~42 KB and ~84 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
Network Waterfall
128 requests over 2964ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 1.4 s LCP 3.7 shttps://channel4.com// https://channel4.com/ — 301 — 86 B — 250 ms — h2https://www.channel4.com/www.channel4.com/ https://www.channel4.com/ — 200 — 7.3 KiB — 156 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 — 28 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 — 49 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 — 47 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 — 41 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 — 61 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 — 178.1 KiB — 61 ms — h2https://dpm.demdex.net/id?d_visid_ver=5.5.0&d_fieldgroup=MC&d_rtbd=json&d_ver=2&d_verify=1&d_orgid=16B222CE527834FC0A490D4D%40AdobeOrg&d_nsid=0&d_coppa=true&ts=1776804930534dpm.demdex.net/id?d_visid_ver=5.5.0... https://dpm.demdex.net/id?d_visid_ver=5.5.0&d_fieldgroup=MC&d_rtbd=json&d_ver=2&d_verify=1&d_orgid=16B222CE527834FC0A490D4D%40AdobeOrg&d_nsid=0&d_coppa=true&ts=1776804930534 — 200 — 670 B — 50 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 — 176.9 KiB — 656 ms — http/1.1https://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 — 8 ms — http/1.1https://channel4.com.ssl.sc.omtrdc.net/id?d_visid_ver=5.5.0&d_fieldgroup=A&mcorgid=16B222CE527834FC0A490D4D%40AdobeOrg&mid=34128548071678574892288219625728650031&d_coppa=true&ts=1776804930644channel4.com.ssl.sc.omtrdc.net/id?d... https://channel4.com.ssl.sc.omtrdc.net/id?d_visid_ver=5.5.0&d_fieldgroup=A&mcorgid=16B222CE527834FC0A490D4D%40AdobeOrg&mid=34128548071678574892288219625728650031&d_coppa=true&ts=1776804930644 — -1 — 0 B — 202 ms — https://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 — 27 ms — h2https://static.c4assets.com/all4-dtm/latest/b8b3c372794b/hostedLibFiles/EP8757b503532a44a68eee17773f6f10a0/AppMeasurement.jsstatic.c4assets.com/all4-dtm/latest... https://static.c4assets.com/all4-dtm/latest/b8b3c372794b/hostedLibFiles/EP8757b503532a44a68eee17773f6f10a0/AppMeasurement.js — 200 — 13.2 KiB — 7 ms — http/1.1https://static.c4assets.com/all4-dtm/latest/b8b3c372794b/hostedLibFiles/EP8757b503532a44a68eee17773f6f10a0/AppMeasurement_Module_ActivityMap.jsstatic.c4assets.com/all4-dtm/latest... https://static.c4assets.com/all4-dtm/latest/b8b3c372794b/hostedLibFiles/EP8757b503532a44a68eee17773f6f10a0/AppMeasurement_Module_ActivityMap.js — 200 — 2.1 KiB — 10 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 — 489 B — 29 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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h2https://ic.c4assets.com/bips/collections/B661E3B6-7A74-4510-a208-66b57f4e4594.jpg?imformat=chrome&resize=500px:*ic.c4assets.com/bips/collections/B6... https://ic.c4assets.com/bips/collections/B661E3B6-7A74-4510-a208-66b57f4e4594.jpg?imformat=chrome&resize=500px:* — 200 — 78.2 KiB — 171 ms — h2https://logx.optimizely.com/v1/eventslogx.optimizely.com/v1/events https://logx.optimizely.com/v1/events — 204 — 368 B — 61 ms — h2https://mssl.fwmrm.net/p/c4_display/LinkTag2.js?mssl.fwmrm.net/p/c4_display/LinkTag... https://mssl.fwmrm.net/p/c4_display/LinkTag2.js? — 200 — 2.7 KiB — 49 ms — h2https://www.channel4.com/identity/whoamiwww.channel4.com/identity/whoami https://www.channel4.com/identity/whoami — 200 — 831 B — 110 ms — h2https://www.channel4.com/identity/whoamiwww.channel4.com/identity/whoami https://www.channel4.com/identity/whoami — 200 — 824 B — 209 ms — h2https://www.channel4.com/identity/whoamiwww.channel4.com/identity/whoami https://www.channel4.com/identity/whoami — 200 — 823 B — 304 ms — h2https://www.channel4.com/identity/whoamiwww.channel4.com/identity/whoami https://www.channel4.com/identity/whoami — 200 — 824 B — 395 ms — h2https://prompts.maze.co/api/widgetsprompts.maze.co/api/widgets https://prompts.maze.co/api/widgets — 204 — 0 B — 31 ms — h2https://prompts.maze.co/api/widgetsprompts.maze.co/api/widgets https://prompts.maze.co/api/widgets — 200 — 156 B — 34 ms — 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https://cdn.optimizely.com/datafiles/Y3rtCHhCAHVUzC9PMnqtuQ.json — 200 — 14.7 KiB — 18 ms — h2https://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 — 5 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 — 7 ms — 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https://static.c4assets.com/all4-dtm/latest/b8b3c372794b/RC4eee81b06a674aa790a559fd94246a52-source.js — 200 — 1016 B — 8 ms — http/1.1https://webstats.channel4.com/b/ss/channel4streaming4od/1/JS-2.27.0-LEWM/s84519146679502?AQB=1&ndh=1&pf=1&t=21%2F3%2F2026%2020%3A55%3A32%202%200&mid=34128548071678574892288219625728650031&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=800x600&c=24&j=1.6&v=N&k=Y&bw=1350&bh=940&mcorgid=16B222CE527834FC0A490D4D%40AdobeOrg&lrt=40&AQE=1webstats.channel4.com/b/ss/channel4... https://webstats.channel4.com/b/ss/channel4streaming4od/1/JS-2.27.0-LEWM/s84519146679502?AQB=1&ndh=1&pf=1&t=21%2F3%2F2026%2020%3A55%3A32%202%200&mid=34128548071678574892288219625728650031&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=800x600&c=24&j=1.6&v=N&k=Y&bw=1350&bh=940&mcorgid=16B222CE527834FC0A490D4D%40AdobeOrg&lrt=40&AQE=1 — 200 — 116 B — 17 ms — h2https://logx.optimizely.com/v1/eventslogx.optimizely.com/v1/events https://logx.optimizely.com/v1/events — 204 — 73 B — 32 ms — h2https://www.channel4.com/favicon.svgwww.channel4.com/favicon.svg https://www.channel4.com/favicon.svg — 200 — 819 B — 19 ms — 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HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
100% of JavaScript execution is third-party
First-party Third-party 1978ms · 709KB · £34/mo
www.channel4.com
Other
Costly
Execution 896ms
Transfer 304 KB
Unused 51%
Monthly Cost £15/mo
www.channel4.com
Other
Costly
Execution 227ms
Transfer 1 KB
Unused 21%
Monthly Cost £4/mo
Optimizely
A/B Testing
Costly
Execution 221ms
Transfer 135 KB
Unused 40%
Monthly Cost £4/mo
Unattributable
Other
Costly
Execution 203ms
Transfer 0 KB
Monthly Cost £4/mo
all4nav.channel4.com
Other
Optional
Execution 172ms
Transfer 177 KB
Unused 40%
Monthly Cost £3/mo
www.channel4.com
Other
Optional
Execution 143ms
Transfer 7 KB
Monthly Cost £2/mo
static.channel4.com
Other
Optional
Execution 59ms
Transfer 47 KB
Monthly Cost £1/mo
www.channel4.com
Other
Optional
Execution 57ms
Transfer 38 KB
Monthly Cost £1/mo

These scripts may cost more than they're worth

  • www.channel4.com adds 896ms and costs ~£15/month
  • www.channel4.com adds 227ms and costs ~£4/month
  • Optimizely adds 221ms and costs ~£4/month
  • Unattributable adds 203ms and costs ~£4/month

100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

When third-party JS execution time exceeds your own, performance gains from frontend work are capped by code you don't own.

Learn more ▾

Every millisecond of third-party JS competes with your own for main-thread time. If their share is bigger than yours, optimization on your code base barely moves the needle. Audit, defer, or remove third-parties before further frontend optimization. Use Lighthouse's third-party audit to identify the worst offenders.

Source: web.dev

www.channel4.com takes 896ms 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

www.channel4.com takes 227ms 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

Optimizely takes 221ms 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 203ms 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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