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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
74
GRADE
C
FIX
5
REVIEW
2
PASS
8
INFO
2

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

Mobile Desktop
10
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
90
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
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.

3.61 s

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

10.04 s

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

2.44 s

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

0.801

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

6.14 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.

17.32 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
17
8 PASS 2 REVIEW 5 FIX
D
Page Weight Budget
Action
2.3 MB transferred, 76 requests
FIX
2.3 MB transferred, 76 requests
Info::
Page weighs 6.0 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::
76 HTTP requests
Info::
Estimated 0.47 g CO2 per page load
2.3 MB / 2.4 MB budget
2.3 MB transferred
76 requests
0.47 g CO2 per page load
JavaScript 1.1 MiB 51%
Images 579.8 KiB 25%
Fonts 393.2 KiB 17%
HTML 84.6 KiB 4%
Other 57.4 KiB 2%
Other 13.8 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
F
JS Execution Cost
Action
6098ms total JS execution
FIX
6098ms total JS execution
Warning::
https://static.files.bbci.co.uk/bbcdotcom/web/2026...: 2367ms CPU time
Warning::
https://www.bbc.com/: 1000ms CPU time
Warning::
https://static.files.bbci.co.uk/bbcdotcom/web/2026...: 566ms CPU time
Warning::
Unattributable: 446ms CPU time
Warning::
https://static.bbci.co.uk/frameworks/requirejs/0.1...: 353ms CPU time
Warning::
Third-party scripts: 6098ms (100% of total)

Main Thread Breakdown

Script Evaluation 67% Style & Layout 13% Other 9% Script Parsing & Compilation 6%
ScriptTotalScriptingParse/CompileParty
https://static.files.bbci.co.uk/bbcdotcom/web/20260407-092955-f3cfe0ee04-web-3.0.0-2/_next/static/chunks/framework-471a843c5613f1bc.js2367ms2219ms10ms3rd
https://www.bbc.com/1000ms22ms4ms3rd
https://static.files.bbci.co.uk/bbcdotcom/web/20260407-092955-f3cfe0ee04-web-3.0.0-2/_next/static/chunks/pages/_app-3601c1768a43d6cc.js566ms370ms106ms3rd
Unattributable446ms28ms0ms3rd
https://static.bbci.co.uk/frameworks/requirejs/0.13.0/sharedmodules/require.js353ms344ms3ms3rd
https://cdn.optimizely.com/public/4621041136/s/bbcx_prod.js269ms219ms37ms3rd
https://cdn.privacy-mgmt.com/unified/wrapperMessagingWithoutDetection.js197ms159ms15ms3rd
https://cdn.tinypass.com/api/tinypass.min.js146ms106ms36ms3rd
https://cdn.privacy-mgmt.com/unified/4.40.1/usnat.f12613136193900e32e2.bundle.js145ms107ms37ms3rd
https://mybbc-analytics.files.bbci.co.uk/echo-client-js/echo-2.6.0-avi.min.js125ms69ms43ms3rd

Showing top 10 of 15 scripts

D
JS Bundles
Action
31 scripts, 479 KB unused
FIX
31 scripts, 479 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: 479 KB
479 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 KB—✓3rd
https://cdn.privacy-mgmt.com/unified/wrapperMessagingWithoutDetection.js42 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
76 resources · 2.3 MB · 479 KB savings available
FIX
76 resources · 2.3 MB · 479 KB savings available
Warning::
Page weight 1.3 MB over 1MB target
Got: 2.3 MB Expected: ≤ 1 MB
Info::
~479 KB of savings available
Warning::
75 third-party resources (100% of weight)
Info::
1 resources over 200KB
76 resources · 2.3 MiB · 75 third-party 1.3 MiB over 1MB target
JavaScript 53% · 1.2 MiB
Image 25% · 586.7 KiB
Font 17% · 393.2 KiB
Document 4% · 84.6 KiB
Other 1% · 14.3 KiB
CSS 0% · 8.6 KiB

~478.6 KiB of savings available

Remove unused JavaScript: 478.6 KiB
B
Image Optimization
22 images, 0 KB saveable
REVIEW
22 images, 0 KB saveable
Info::
All images are well-optimized
22 images 580 KB
0 oversized -0 KB
5 legacy format
0 missing dimensions CLS risk
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 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 3.6 s LCP 10.0 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 — 9 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 — 19 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 — 15 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 — 25 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 — 30 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 — 29 ms — font-display: swap
BBCReithSans_W_Md.woff2 woff2 swap
Size 64 KB
Load time 9 ms
Start 214 ms
Risk FOUT — text flashes from fallback to web font
BBCReithSans_W_Rg.woff2 woff2 swap
Size 66 KB
Load time 19 ms
Start 214 ms
Risk FOUT — text flashes from fallback to web font
BBCReithSans_W_Bd.woff2 woff2 swap
Size 59 KB
Load time 15 ms
Start 215 ms
Risk FOUT — text flashes from fallback to web font
BBCReithSerif_W_Md.woff2 woff2 swap
Size 78 KB
Load time 25 ms
Start 215 ms
Risk FOUT — text flashes from fallback to web font
BBCReithSerif_W_Rg.woff2 woff2 swap
Size 79 KB
Load time 30 ms
Start 215 ms
Risk FOUT — text flashes from fallback to web font
BBCReithSans_W_ExBd.woff2 woff2 swap
Size 47 KB
Load time 29 ms
Start 215 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
10 hints, 0 missing preconnects
PASS
10 hints, 0 missing preconnects
Info::
Page uses 10 resource hint(s)

Current Resource Hints

preconnect
9
preload
1
dns-prefetch
—
prefetch
—

10 resource hints configured

A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
A
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
76 requests over 2236ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 3.6 s LCP 10.0 shttps://bbc.com// https://bbc.com/ — 301 — 536 B — 10 ms — h2https://www.bbc.com/www.bbc.com/ https://www.bbc.com/ — 200 — 80.8 KiB — 17 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 — 46 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 — 58 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 — 129 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 — 55 ms — h2https://ichef.bbci.co.uk/ace/standard/800/cpsprodpb/a31d/live/edf6ab00-39ac-11f1-935d-b365217506c0.jpg.webpichef.bbci.co.uk/ace/standard/800/c... https://ichef.bbci.co.uk/ace/standard/800/cpsprodpb/a31d/live/edf6ab00-39ac-11f1-935d-b365217506c0.jpg.webp — 200 — 53.9 KiB — 54 ms — h2https://ichef.bbci.co.uk/news/240/cpsprodpb/f761/live/d7a90480-396e-11f1-8606-05fe34b06e1b.png.webpichef.bbci.co.uk/news/240/cpsprodpb... https://ichef.bbci.co.uk/news/240/cpsprodpb/f761/live/d7a90480-396e-11f1-8606-05fe34b06e1b.png.webp — 200 — 5.4 KiB — 45 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 — 131 ms — h2https://cdn.tinypass.com/api/tinypass.min.jscdn.tinypass.com/api/tinypass.min.j... https://cdn.tinypass.com/api/tinypass.min.js — 200 — 132.2 KiB — 147 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 — 80 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 — 44 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 — 58 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 — 50 ms — h2https://static.files.bbci.co.uk/bbcdotcom/web/20260407-092955-f3cfe0ee04-web-3.0.0-2/site.webmanifeststatic.files.bbci.co.uk/bbcdotcom/w... https://static.files.bbci.co.uk/bbcdotcom/web/20260407-092955-f3cfe0ee04-web-3.0.0-2/site.webmanifest — 200 — 1.1 KiB — 25 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 — 49 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 — 22 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 — 23 ms — 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https://ping.chartbeat.net/ping?h=bbc.com&p=%2F&u=BRMrJvBLJWN5Dld2ZE&d=bbc.com&g=50924&g0=No%20Section&g1=NewsMediaOrganization&g4=indexPage&n=1&f=00001&c=0&x=0&m=0&y=15284&o=412&w=823&j=45&R=1&W=0&I=0&E=0&e=0&r=&PA=https%3A%2F%2Fwww.bbc.com%2F&b=1286&_s=%7B%7D&t=DcBmy6DOwS68DDiH9qCqXdlZCWWbOK&V=150&i=BBC%20Home%20-%20Breaking%20News%2C%20World%20News%2C%20US%20News%2C%20Sports%2C%20Business%2C%20Innovation%2C%20Climate%2C%20Culture%2C%20Travel%2C%20Video%20%26%20Audio&tz=0&_=a&sn=1&sv=D7p_ODBaLojfBpdY7OBBQbRkD6dqEC&sr=external&sd=1&im=062b2f3f&_ — 200 — 201 B — 314 ms — h2https://cdn.privacy-mgmt.com/unified/4.40.1/gdpr-tcf.27718c8cb9d29947d2c1.bundle.jscdn.privacy-mgmt.com/unified/4.40.1... https://cdn.privacy-mgmt.com/unified/4.40.1/gdpr-tcf.27718c8cb9d29947d2c1.bundle.js — 200 — 24.8 KiB — 22 ms — h2https://cdn.privacy-mgmt.com/unified/4.40.1/usnat.f12613136193900e32e2.bundle.jscdn.privacy-mgmt.com/unified/4.40.1... https://cdn.privacy-mgmt.com/unified/4.40.1/usnat.f12613136193900e32e2.bundle.js — 200 — 42.3 KiB — 27 ms — h2https://cdn.privacy-mgmt.com/mms/v2/get_site_data?hasCsp=true&href=https%3A%2F%2Fwww.bbc.com%2F&account_id=1786cdn.privacy-mgmt.com/mms/v2/get_sit... https://cdn.privacy-mgmt.com/mms/v2/get_site_data?hasCsp=true&href=https%3A%2F%2Fwww.bbc.com%2F&account_id=1786 — 200 — 617 B — 58 ms — h2https://mybbc-analytics.files.bbci.co.uk/analytics-remote-config/producers.jsonmybbc-analytics.files.bbci.co.uk/an... https://mybbc-analytics.files.bbci.co.uk/analytics-remote-config/producers.json — 200 — 1.8 KiB — 55 ms — h2https://mybbc-analytics.files.bbci.co.uk/analytics-remote-config/masterbrands.jsonmybbc-analytics.files.bbci.co.uk/an... https://mybbc-analytics.files.bbci.co.uk/analytics-remote-config/masterbrands.json — 200 — 1.9 KiB — 55 ms — h2https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.jspagead2.googlesyndication.com/pagea... https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js — 200 — 54.2 KiB — 122 ms — h3https://cdn.privacy-mgmt.com/wrapper/v2/meta-data?hasCsp=true&accountId=1786&env=prod&metadata=%7B%22gdpr%22%3A%7B%7D%2C%22usnat%22%3A%7B%7D%7D&propertyId=26225&scriptVersion=4.40.1&scriptType=unifiedcdn.privacy-mgmt.com/wrapper/v2/met... https://cdn.privacy-mgmt.com/wrapper/v2/meta-data?hasCsp=true&accountId=1786&env=prod&metadata=%7B%22gdpr%22%3A%7B%7D%2C%22usnat%22%3A%7B%7D%7D&propertyId=26225&scriptVersion=4.40.1&scriptType=unified — 200 — 1.1 KiB — 129 ms — h2https://a1.api.bbc.com/event?s=638824&idclient=f4c211b6-4e0c-4d8b-9b91-64acda76a51aa1.api.bbc.com/event?s=638824&idcli... https://a1.api.bbc.com/event?s=638824&idclient=f4c211b6-4e0c-4d8b-9b91-64acda76a51a — 204 — 325 B — 130 ms — h2https://a1.api.bbc.com/event?s=638824&idclient=f4c211b6-4e0c-4d8b-9b91-64acda76a51aa1.api.bbc.com/event?s=638824&idcli... https://a1.api.bbc.com/event?s=638824&idclient=f4c211b6-4e0c-4d8b-9b91-64acda76a51a 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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 6098ms · 996KB · £105/mo
static.files.bbci.co.uk
Other
Costly
Execution 2367ms
Transfer 45 KB
Monthly Cost £41/mo
www.bbc.com
Other
Costly
Execution 1000ms
Transfer 81 KB
Monthly Cost £17/mo
static.files.bbci.co.uk
Other
Costly
Execution 566ms
Transfer 327 KB
Unused 50%
Monthly Cost £10/mo
Unattributable
Other
Costly
Execution 446ms
Transfer 0 KB
Monthly Cost £8/mo
static.bbci.co.uk
Other
Costly
Execution 353ms
Transfer 8 KB
Monthly Cost £6/mo
Optimizely
A/B Testing
Costly
Execution 269ms
Transfer 98 KB
Unused 40%
Monthly Cost £5/mo
cdn.privacy-mgmt.com
Other
Optional
Execution 197ms
Transfer 42 KB
Monthly Cost £3/mo
cdn.tinypass.com
Other
Optional
Execution 146ms
Transfer 132 KB
Unused 77%
Monthly Cost £3/mo
cdn.privacy-mgmt.com
Other
Optional
Execution 145ms
Transfer 42 KB
Unused 54%
Monthly Cost £2/mo
mybbc-analytics.files.bbci.co.uk
Other
Optional
Execution 125ms
Transfer 117 KB
Unused 49%
Monthly Cost £2/mo
static.chartbeat.com
Other
Optional
Execution 116ms
Transfer 16 KB
Monthly Cost £2/mo
static.files.bbci.co.uk
Other
Optional
Execution 106ms
Transfer 1 KB
Monthly Cost £2/mo
static.files.bbci.co.uk
Other
Optional
Execution 100ms
Transfer 39 KB
Monthly Cost £2/mo
gn-web-assets.api.bbc.com
Other
Optional
Execution 99ms
Transfer 22 KB
Monthly Cost £2/mo
cdn.privacy-mgmt.com
Other
Optional
Execution 64ms
Transfer 25 KB
Monthly Cost £1/mo

These scripts may cost more than they're worth

  • static.files.bbci.co.uk adds 2367ms and costs ~£41/month
  • www.bbc.com adds 1000ms and costs ~£17/month
  • static.files.bbci.co.uk adds 566ms and costs ~£10/month
  • Unattributable adds 446ms and costs ~£8/month
  • static.bbci.co.uk adds 353ms and costs ~£6/month
  • Optimizely adds 269ms 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

static.files.bbci.co.uk takes 2367ms 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 1000ms 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

static.files.bbci.co.uk takes 566ms 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

Unattributable takes 446ms 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

static.bbci.co.uk takes 353ms 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 269ms 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

77% of cdn.tinypass.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

54% of cdn.privacy-mgmt.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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