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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
74
GRADE
C
FIX
4
REVIEW
3
PASS
6
INFO
2

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

Mobile Desktop
70
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
91
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

903 ms

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

1.19 s

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

203 ms

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

0.346

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

1.87 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.

3.29 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
6 PASS 3 REVIEW 4 FIX
D
Page Weight Budget
Action
2.3 MB transferred, 90 requests
FIX
2.3 MB transferred, 90 requests
Info::
Page weighs 6.1 MB (2.3 MB transferred)
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
Info::
Fonts are 393 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 393 KB
Info::
90 HTTP requests
Info::
Estimated 0.49 g CO2 per page load
2.3 MB / 2.4 MB budget
2.3 MB transferred
90 requests
0.49 g CO2 per page load
JavaScript 1.1 MiB 49%
Images 662.2 KiB 28%
Fonts 393.2 KiB 16%
HTML 84.6 KiB 4%
Other 57.4 KiB 2%
Other 14.8 KiB 1%
CSS 8.6 KiB 0%
Other 7.4 KiB 0%
Other 1.1 KiB 0%
0 2.4 MB 4.9 MB
Approaching limit

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

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

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 (2.3 MiB of 2.3 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Bundles
Action
31 scripts, 499 KB unused
FIX
31 scripts, 499 KB unused
Warning::
https://static.files.bbci.co.uk/bbcdotcom/web/2026...: 164 KB unused (50%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.tinypass.com/api/tinypass.min.js: 101 KB unused (77%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://mybbc-analytics.files.bbci.co.uk/echo-clie...: 57 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.optimizely.com/public/4621041136/s/bbc...: 39 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://emp.bbci.co.uk/emp/bump-4/bump-4.js: 35 KB unused (90%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 499 KB
499 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://static.files.bbci.co.uk/bbcdotcom/web/20260407-092955-f3cfe0ee04-web-3.0.0-2/_next/static/chunks/pages/_app-3601c1768a43d6cc.js327 KB164 KB (50%)✓3rd
https://cdn.tinypass.com/api/tinypass.min.js132 KB101 KB (77%)✓3rd
https://mybbc-analytics.files.bbci.co.uk/echo-client-js/echo-2.6.0-avi.min.js117 KB57 KB (49%)✓3rd
https://cdn.optimizely.com/public/4621041136/s/bbcx_prod.js98 KB39 KB (40%)✓3rd
https://emp.bbci.co.uk/emp/bump-4/bump-4.js40 KB35 KB (90%)✓3rd
https://static.files.bbci.co.uk/bbcdotcom/web/20260407-092955-f3cfe0ee04-web-3.0.0-2/_next/static/chunks/822-f7c0c3707aa22ef1.js48 KB34 KB (72%)✓3rd
https://static.files.bbci.co.uk/bbcdotcom/web/20260407-092955-f3cfe0ee04-web-3.0.0-2/_next/static/chunks/354-a0ad6e0ee35c873e.js34 KB24 KB (73%)✓3rd
https://cdn.privacy-mgmt.com/unified/4.40.1/usnat.f12613136193900e32e2.bundle.js42 KB23 KB (54%)✓3rd
https://static.files.bbci.co.uk/bbcdotcom/web/20260407-092955-f3cfe0ee04-web-3.0.0-2/_next/static/chunks/main-fec0878bf69bd0df.js39 KB21 KB (54%)✓3rd
https://uk-script.dotmetrics.net/door.js?d=www.bbc.com&t=homestudio5 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

F
Page Weight Inventory
Action
90 resources · 2.3 MB · 499 KB savings available
FIX
90 resources · 2.3 MB · 499 KB savings available
Warning::
Page weight 1.3 MB over 1MB target
Got: 2.3 MB Expected: ≤ 1 MB
Info::
~499 KB of savings available
Warning::
89 third-party resources (100% of weight)
Info::
1 resources over 200KB
90 resources · 2.3 MiB · 89 third-party 1.3 MiB over 1MB target
JavaScript 51% · 1.2 MiB
Image 28% · 669.0 KiB
Font 16% · 393.2 KiB
Document 4% · 84.6 KiB
Other 1% · 15.3 KiB
CSS 0% · 8.6 KiB

~499.1 KiB of savings available

Remove unused JavaScript: 499.1 KiB
B
Image Optimization
33 images, 0 KB saveable
REVIEW
33 images, 0 KB saveable
Info::
All images are well-optimized
33 images 662 KB
0 oversized -0 KB
5 legacy format
0 missing dimensions CLS risk
C
JS Execution Cost
Action
1206ms total JS execution
REVIEW
1206ms total JS execution
Warning::
https://static.files.bbci.co.uk/bbcdotcom/web/2026...: 553ms CPU time
Info::
https://www.bbc.com/: 231ms CPU time
Info::
https://static.files.bbci.co.uk/bbcdotcom/web/2026...: 158ms CPU time
Info::
Unattributable: 122ms CPU time
Info::
https://static.bbci.co.uk/frameworks/requirejs/0.1...: 71ms CPU time
Warning::
Third-party scripts: 1206ms (100% of total)

Main Thread Breakdown

Script Evaluation 66% Style & Layout 13% Other 10% Script Parsing & Compilation 7%
ScriptTotalScriptingParse/CompileParty
https://static.files.bbci.co.uk/bbcdotcom/web/20260407-092955-f3cfe0ee04-web-3.0.0-2/_next/static/chunks/framework-471a843c5613f1bc.js553ms519ms3ms3rd
https://www.bbc.com/231ms5ms1ms3rd
https://static.files.bbci.co.uk/bbcdotcom/web/20260407-092955-f3cfe0ee04-web-3.0.0-2/_next/static/chunks/pages/_app-3601c1768a43d6cc.js158ms104ms33ms3rd
Unattributable122ms8ms0ms3rd
https://static.bbci.co.uk/frameworks/requirejs/0.13.0/sharedmodules/require.js71ms69ms1ms3rd
https://cdn.optimizely.com/public/4621041136/s/bbcx_prod.js71ms59ms9ms3rd
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 (393 KB)
PASS
6 fonts (393 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

393 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 500 ms 1.0 s FCP 903 ms LCP 1.2 shttps://static.files.bbci.co.uk/fonts/reith/2.512/BBCReithSans_W_Md.woff2BBCReithSans_W_Md.woff2 https://static.files.bbci.co.uk/fonts/reith/2.512/BBCReithSans_W_Md.woff2 — 64.5 KiB — 27 ms — font-display: swaphttps://static.files.bbci.co.uk/fonts/reith/2.512/BBCReithSans_W_Bd.woff2BBCReithSans_W_Bd.woff2 https://static.files.bbci.co.uk/fonts/reith/2.512/BBCReithSans_W_Bd.woff2 — 59.0 KiB — 31 ms — font-display: swaphttps://static.files.bbci.co.uk/fonts/reith/2.512/BBCReithSans_W_Rg.woff2BBCReithSans_W_Rg.woff2 https://static.files.bbci.co.uk/fonts/reith/2.512/BBCReithSans_W_Rg.woff2 — 65.6 KiB — 53 ms — font-display: swaphttps://static.files.bbci.co.uk/fonts/reith/2.512/BBCReithSerif_W_Md.woff2BBCReithSerif_W_Md.woff2 https://static.files.bbci.co.uk/fonts/reith/2.512/BBCReithSerif_W_Md.woff2 — 78.0 KiB — 37 ms — font-display: swaphttps://static.files.bbci.co.uk/fonts/reith/2.512/BBCReithSerif_W_Rg.woff2BBCReithSerif_W_Rg.woff2 https://static.files.bbci.co.uk/fonts/reith/2.512/BBCReithSerif_W_Rg.woff2 — 78.7 KiB — 44 ms — font-display: swaphttps://static.files.bbci.co.uk/fonts/reith/2.512/BBCReithSans_W_ExBd.woff2BBCReithSans_W_ExBd.woff2 https://static.files.bbci.co.uk/fonts/reith/2.512/BBCReithSans_W_ExBd.woff2 — 47.4 KiB — 50 ms — font-display: swap
BBCReithSans_W_Md.woff2 woff2 swap
Size 64 KB
Load time 27 ms
Start 170 ms
Risk FOUT — text flashes from fallback to web font
BBCReithSans_W_Bd.woff2 woff2 swap
Size 59 KB
Load time 31 ms
Start 170 ms
Risk FOUT — text flashes from fallback to web font
BBCReithSans_W_Rg.woff2 woff2 swap
Size 66 KB
Load time 53 ms
Start 174 ms
Risk FOUT — text flashes from fallback to web font
BBCReithSerif_W_Md.woff2 woff2 swap
Size 78 KB
Load time 37 ms
Start 174 ms
Risk FOUT — text flashes from fallback to web font
BBCReithSerif_W_Rg.woff2 woff2 swap
Size 79 KB
Load time 44 ms
Start 174 ms
Risk FOUT — text flashes from fallback to web font
BBCReithSans_W_ExBd.woff2 woff2 swap
Size 47 KB
Load time 50 ms
Start 174 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
HTTP Caching
max-age=604800 (1 week)
PASS
max-age=604800 (1 week)
Info::
Cache-Control header is set
Got: public,max-age=604800,stale-while-revalidate=3600,stale-if-error=3600
Info::
Effective TTL: 1 week (max-age=604800)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

public,max-age=604800,stale-while-revalidate=3600,stale-if-error=3600

DirectiveValueMeaning
public—Any cache may store this response
max-age604800Cache for 1 week
stale-while-revalidate3600Serve stale for 1 hour while fetching fresh
stale-if-error3600
Effective TTL: 604800 seconds
Network Waterfall
90 requests over 2127ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 903 ms LCP 1.2 shttps://bbc.com// https://bbc.com/ — 301 — 537 B — 6 ms — h2https://www.bbc.com/www.bbc.com/ https://www.bbc.com/ — 200 — 80.8 KiB — 10 ms — h2https://static.files.bbci.co.uk/bbcdotcom/web/20260407-092955-f3cfe0ee04-web-3.0.0-2/_next/static/css/63d5374b87d0d2c4.cssstatic.files.bbci.co.uk/bbcdotcom/w... https://static.files.bbci.co.uk/bbcdotcom/web/20260407-092955-f3cfe0ee04-web-3.0.0-2/_next/static/css/63d5374b87d0d2c4.css — 200 — 1.9 KiB — 19 ms — h2https://static.bbci.co.uk/frameworks/requirejs/0.13.0/sharedmodules/require.jsstatic.bbci.co.uk/frameworks/requir... https://static.bbci.co.uk/frameworks/requirejs/0.13.0/sharedmodules/require.js — 200 — 8.4 KiB — 35 ms — h2https://gn-web-assets.api.bbc.com/ngas/latest/dotcom-bootstrap.jsgn-web-assets.api.bbc.com/ngas/late... https://gn-web-assets.api.bbc.com/ngas/latest/dotcom-bootstrap.js — 200 — 22.3 KiB — 70 ms — http/1.1https://static.files.bbci.co.uk/bbcdotcom/web/20260407-092955-f3cfe0ee04-web-3.0.0-2/grey-placeholder.pngstatic.files.bbci.co.uk/bbcdotcom/w... https://static.files.bbci.co.uk/bbcdotcom/web/20260407-092955-f3cfe0ee04-web-3.0.0-2/grey-placeholder.png — 200 — 1.2 KiB — 17 ms — h2https://ichef.bbci.co.uk/ace/standard/480/cpsprodpb/a31d/live/edf6ab00-39ac-11f1-935d-b365217506c0.jpg.webpichef.bbci.co.uk/ace/standard/480/c... https://ichef.bbci.co.uk/ace/standard/480/cpsprodpb/a31d/live/edf6ab00-39ac-11f1-935d-b365217506c0.jpg.webp — 200 — 22.3 KiB — 31 ms — h2https://ichef.bbci.co.uk/news/480/cpsprodpb/f761/live/d7a90480-396e-11f1-8606-05fe34b06e1b.png.webpichef.bbci.co.uk/news/480/cpsprodpb... https://ichef.bbci.co.uk/news/480/cpsprodpb/f761/live/d7a90480-396e-11f1-8606-05fe34b06e1b.png.webp — 200 — 15.9 KiB — 17 ms — h2https://cdn.optimizely.com/public/4621041136/s/bbcx_prod.jscdn.optimizely.com/public/462104113... https://cdn.optimizely.com/public/4621041136/s/bbcx_prod.js — 200 — 97.7 KiB — 106 ms — h2https://cdn.tinypass.com/api/tinypass.min.jscdn.tinypass.com/api/tinypass.min.j... https://cdn.tinypass.com/api/tinypass.min.js — 200 — 132.3 KiB — 133 ms — h3https://emp.bbci.co.uk/emp/bump-4/bump-4.jsemp.bbci.co.uk/emp/bump-4/bump-4.js https://emp.bbci.co.uk/emp/bump-4/bump-4.js — 200 — 40.3 KiB — 23 ms — h2https://static.files.bbci.co.uk/bbcdotcom/web/20260407-092955-f3cfe0ee04-web-3.0.0-2/_next/static/chunks/webpack-e687dc6f00785b9b.jsstatic.files.bbci.co.uk/bbcdotcom/w... https://static.files.bbci.co.uk/bbcdotcom/web/20260407-092955-f3cfe0ee04-web-3.0.0-2/_next/static/chunks/webpack-e687dc6f00785b9b.js — 200 — 3.1 KiB — 16 ms — h2https://static.files.bbci.co.uk/bbcdotcom/web/20260407-092955-f3cfe0ee04-web-3.0.0-2/_next/static/chunks/framework-471a843c5613f1bc.jsstatic.files.bbci.co.uk/bbcdotcom/w... https://static.files.bbci.co.uk/bbcdotcom/web/20260407-092955-f3cfe0ee04-web-3.0.0-2/_next/static/chunks/framework-471a843c5613f1bc.js — 200 — 44.7 KiB — 23 ms — h2https://static.files.bbci.co.uk/bbcdotcom/web/20260407-092955-f3cfe0ee04-web-3.0.0-2/_next/static/chunks/main-fec0878bf69bd0df.jsstatic.files.bbci.co.uk/bbcdotcom/w... https://static.files.bbci.co.uk/bbcdotcom/web/20260407-092955-f3cfe0ee04-web-3.0.0-2/_next/static/chunks/main-fec0878bf69bd0df.js — 200 — 39.0 KiB — 23 ms — h2https://static.files.bbci.co.uk/bbcdotcom/web/20260407-092955-f3cfe0ee04-web-3.0.0-2/_next/static/chunks/pages/_app-3601c1768a43d6cc.jsstatic.files.bbci.co.uk/bbcdotcom/w... https://static.files.bbci.co.uk/bbcdotcom/web/20260407-092955-f3cfe0ee04-web-3.0.0-2/_next/static/chunks/pages/_app-3601c1768a43d6cc.js — 200 — 326.7 KiB — 51 ms — h2https://static.files.bbci.co.uk/bbcdotcom/web/20260407-092955-f3cfe0ee04-web-3.0.0-2/_next/static/chunks/565-3fe8c6555c9e19af.jsstatic.files.bbci.co.uk/bbcdotcom/w... https://static.files.bbci.co.uk/bbcdotcom/web/20260407-092955-f3cfe0ee04-web-3.0.0-2/_next/static/chunks/565-3fe8c6555c9e19af.js — 200 — 15.5 KiB — 28 ms — h2https://static.files.bbci.co.uk/bbcdotcom/web/20260407-092955-f3cfe0ee04-web-3.0.0-2/_next/static/chunks/354-a0ad6e0ee35c873e.jsstatic.files.bbci.co.uk/bbcdotcom/w... https://static.files.bbci.co.uk/bbcdotcom/web/20260407-092955-f3cfe0ee04-web-3.0.0-2/_next/static/chunks/354-a0ad6e0ee35c873e.js — 200 — 33.7 KiB — 44 ms — h2https://static.files.bbci.co.uk/bbcdotcom/web/20260407-092955-f3cfe0ee04-web-3.0.0-2/_next/static/chunks/958-96982c2ceb522675.jsstatic.files.bbci.co.uk/bbcdotcom/w... https://static.files.bbci.co.uk/bbcdotcom/web/20260407-092955-f3cfe0ee04-web-3.0.0-2/_next/static/chunks/958-96982c2ceb522675.js — 200 — 3.9 KiB — 31 ms — h2https://static.files.bbci.co.uk/bbcdotcom/web/20260407-092955-f3cfe0ee04-web-3.0.0-2/_next/static/chunks/103-134cad6ac039894a.jsstatic.files.bbci.co.uk/bbcdotcom/w... https://static.files.bbci.co.uk/bbcdotcom/web/20260407-092955-f3cfe0ee04-web-3.0.0-2/_next/static/chunks/103-134cad6ac039894a.js — 200 — 2.4 KiB — 32 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 1206ms · 558KB · £21/mo
static.files.bbci.co.uk
Other
Costly
Execution 553ms
Transfer 45 KB
Monthly Cost £10/mo
www.bbc.com
Other
Costly
Execution 231ms
Transfer 81 KB
Monthly Cost £4/mo
static.files.bbci.co.uk
Other
Optional
Execution 158ms
Transfer 327 KB
Unused 50%
Monthly Cost £3/mo
Unattributable
Other
Optional
Execution 122ms
Transfer 0 KB
Monthly Cost £2/mo
static.bbci.co.uk
Other
Optional
Execution 71ms
Transfer 8 KB
Monthly Cost £1/mo
Optimizely
A/B Testing
Optional
Execution 71ms
Transfer 98 KB
Unused 40%
Monthly Cost £1/mo

These scripts may cost more than they're worth

  • static.files.bbci.co.uk adds 553ms and costs ~£10/month
  • www.bbc.com adds 231ms 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

static.files.bbci.co.uk takes 553ms 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.bbc.com takes 231ms 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 static.files.bbci.co.uk'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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