Skip to content
https://www.bbc.com

Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
69
GRADE
D
FIX
4
REVIEW
2
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.
96
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.

628 ms

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

1.43 s

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

563 ms

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

0.012

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

1.83 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.

5.15 s

Page Load Progression

638 ms
1.3 s
1.9 s
2.6 s
3.2 s
3.8 s
4.5 s
5.1 s
Checks
14
6 PASS 2 REVIEW 4 FIX
F
Page Weight Budget
Action
3.8 MB transferred, 139 requests
FIX
3.8 MB transferred, 139 requests
Warning::
Page weighs 10.2 MB (3.8 MB transferred)
Warning::
Images are 1.4 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.4 MB
Warning::
JavaScript is 1.3 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.3 MB
Info::
Fonts are 661 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 661 KB
Warning::
139 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.79 g CO2 per page load
3.8 MB / 2.4 MB budget
3.8 MB transferred
139 requests
0.79 g CO2 per page load
Images 1.4 MiB 38%
JavaScript 1.3 MiB 34%
Fonts 661.0 KiB 17%
HTML 232.4 KiB 6%
CSS 104.3 KiB 3%
Other 58.9 KiB 2%
Other 15.5 KiB 0%
Other 6.9 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

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

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
98% third-party, 0 ms blocking
FIX
98% third-party, 0 ms blocking
Warning::
Third-party code accounts for 98% of page weight (3.7 MiB of 3.8 MiB)
Info::
Third-party blocking time is low (0 ms)
98%
First-party Third-party
D
JS Execution Cost
Action
2475ms total JS execution
FIX
2475ms total JS execution
Warning::
https://static.files.bbci.co.uk/bbcdotcom/web/2026...: 967ms CPU time
Warning::
https://www.bbc.com/: 458ms CPU time
Warning::
Unattributable: 263ms CPU time
Info::
https://cdn.tinypass.com/api/tinypass.min.js: 214ms CPU time
Info::
https://static.files.bbci.co.uk/bbcdotcom/web/2026...: 213ms CPU time
Warning::
Third-party scripts: 2017ms (82% of total)

Main Thread Breakdown

Script Evaluation 61% Other 16% Style & Layout 12% Script Parsing & Compilation 4%
ScriptTotalScriptingParse/CompileParty
https://static.files.bbci.co.uk/bbcdotcom/web/20260326-074245-a525cdfbda-web-2.43.1-1/_next/static/chunks/framework-271ed3bb0c2eae77.js967ms881ms5ms3rd
https://www.bbc.com/458ms13ms1ms1st
Unattributable263ms50ms0ms3rd
https://cdn.tinypass.com/api/tinypass.min.js214ms135ms24ms3rd
https://static.files.bbci.co.uk/bbcdotcom/web/20260326-074245-a525cdfbda-web-2.43.1-1/_next/static/chunks/pages/_app-94f91aef33149c2e.js213ms134ms37ms3rd
https://cdn.optimizely.com/public/4621041136/s/bbcx_prod.js111ms87ms8ms3rd
https://static.bbci.co.uk/frameworks/requirejs/0.13.0/sharedmodules/require.js105ms100ms1ms3rd
https://mybbc-analytics.files.bbci.co.uk/echo-client-js/echo-2.6.0-avi.min.js92ms51ms11ms3rd
https://static.chartbeat.com/js/chartbeat.js53ms35ms2ms3rd
D
JS Bundles
Action
59 scripts, 471 KB unused
FIX
59 scripts, 471 KB unused
Warning::
https://static.files.bbci.co.uk/bbcdotcom/web/2026...: 148 KB unused (46%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.tinypass.com/api/tinypass.min.js: 70 KB unused (53%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://mybbc-analytics.files.bbci.co.uk/echo-clie...: 58 KB unused (50%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.optimizely.com/public/4621041136/s/bbc...: 39 KB unused (41%)
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: 471 KB
471 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://static.files.bbci.co.uk/bbcdotcom/web/20260326-074245-a525cdfbda-web-2.43.1-1/_next/static/chunks/pages/_app-94f91aef33149c2e.js320 KB148 KB (46%)✓3rd
https://cdn.tinypass.com/api/tinypass.min.js132 KB70 KB (53%)✓3rd
https://mybbc-analytics.files.bbci.co.uk/echo-client-js/echo-2.6.0-avi.min.js117 KB58 KB (50%)✓3rd
https://cdn.optimizely.com/public/4621041136/s/bbcx_prod.js97 KB39 KB (41%)✓3rd
https://emp.bbci.co.uk/emp/bump-4/bump-4.js40 KB35 KB (90%)✓3rd
https://static.files.bbci.co.uk/bbcdotcom/web/20260326-074245-a525cdfbda-web-2.43.1-1/_next/static/chunks/841-5b198c3d22bd273f.js48 KB34 KB (71%)✓3rd
https://static.files.bbci.co.uk/bbcdotcom/web/20260326-074245-a525cdfbda-web-2.43.1-1/_next/static/chunks/691-c429237c06f4f550.js34 KB24 KB (72%)✓3rd
https://cdn.cxense.com/cx.js38 KB21 KB (56%)✓3rd
https://cdn.cxense.com/cx.js38 KB21 KB (56%)✓3rd
https://uk-script.dotmetrics.net/Scripts/script.js?v=36228 KB21 KB (73%)✓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

C
Image Optimization
Action
42 images, 0 KB saveable
REVIEW
42 images, 0 KB saveable
Warning::
https://ichef.bbci.co.uk/images/ic/240xn/p0n3ckc6.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://ichef.bbci.co.uk/images/ic/240xn/p0mmzd91.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://ichef.bbci.co.uk/images/ic/240xn/p0n4vby9.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://ichef.bbci.co.uk/images/ic/240xn/p0m2djkd.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://ichef.bbci.co.uk/images/ic/240xn/p0n7vy55.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://ichef.bbci.co.uk/images/ic/240xn/p0n367wh.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://ichef.bbci.co.uk/images/ic/240xn/p0m2d1l2.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://ichef.bbci.co.uk/images/ic/240xn/p0m2bkzn.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://ichef.bbci.co.uk/images/ic/240xn/p0m2bpkc.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://ichef.bbci.co.uk/images/ic/240xn/p0m2bgmn.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://ichef.bbci.co.uk/images/ic/240xn/p0n3cq6z.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://ichef.bbci.co.uk/images/ic/240xn/p0n51w81.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://ichef.bbci.co.uk/images/ic/240xn/p0m2bqvt.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://ichef.bbci.co.uk/images/ic/240xn/p0m69y3v.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://ichef.bbci.co.uk/images/ic/240xn/p0mw4552.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://ichef.bbci.co.uk/images/ic/240xn/p0mjhwn5.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
42 images 1.4 MB
0 oversized -0 KB
6 legacy format
16 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

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

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

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
12 fonts (661 KB)
PASS
12 fonts (661 KB)
Info::
12 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

12

661 KB total

Render-blocking

0

of 12

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s FCP 628 ms LCP 1.4 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 — 0 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 — 0 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 — 0 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 — 0 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 — 0 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 — 0 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 — 0 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 — 0 B — 0 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 — 0 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 — 0 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 — 0 B — 0 ms — font-display: swaphttps://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 — 0 ms — font-display: swap
BBCReithSans_W_Md.woff2 woff2 swap
Size 64 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
BBCReithSans_W_Bd.woff2 woff2 swap
Size 59 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
BBCReithSans_W_Rg.woff2 woff2 swap
Size 66 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
BBCReithSerif_W_Md.woff2 woff2 swap
Size 78 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
BBCReithSerif_W_Rg.woff2 woff2 swap
Size 79 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
BBCReithSans_W_ExBd.woff2 woff2 swap
Size 47 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
BBCReithSans_W_Rg.woff2 woff2 swap
Size 66 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
BBCReithSans_W_Rg.woff2 woff2 swap
Size 0 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
BBCReithSerif_W_Rg.woff2 woff2 swap
Size 79 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
BBCReithSans_W_Bd.woff2 woff2 swap
Size 59 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
BBCReithSerif_W_Rg.woff2 woff2 swap
Size 0 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
BBCReithSans_W_Md.woff2 woff2 swap
Size 64 KB
Load time 0 ms
Start 0 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=30 (30 seconds)
PASS
max-age=30 (30 seconds)
Info::
Cache-Control header is set
Got: public, stale-if-error=90, stale-while-revalidate=30, max-age=30
Info::
Effective TTL: 30 seconds (max-age=30)
Info::
ETag present — enables conditional (304) responses
Cache-Control

public, stale-if-error=90, stale-while-revalidate=30, max-age=30

DirectiveValueMeaning
public—Any cache may store this response
stale-if-error90
stale-while-revalidate30Serve stale for 30 seconds while fetching fresh
max-age30Cache for 30 seconds
Effective TTL: 30 seconds
Network Waterfall
139 requests over 0ms
INFO

Performance analysis not available for this result.

Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
82% of JavaScript execution is third-party
First-party Third-party 2017ms · 735KB · £35/mo
static.files.bbci.co.uk
Other
Costly
Execution 967ms
Transfer 45 KB
Monthly Cost £17/mo
Unattributable
Other
Costly
Execution 263ms
Transfer 0 KB
Monthly Cost £5/mo
cdn.tinypass.com
Other
Costly
Execution 214ms
Transfer 132 KB
Unused 53%
Monthly Cost £4/mo
static.files.bbci.co.uk
Other
Costly
Execution 213ms
Transfer 320 KB
Unused 46%
Monthly Cost £4/mo
Optimizely
A/B Testing
Optional
Execution 111ms
Transfer 97 KB
Unused 41%
Monthly Cost £2/mo
static.bbci.co.uk
Other
Optional
Execution 105ms
Transfer 8 KB
Monthly Cost £2/mo
mybbc-analytics.files.bbci.co.uk
Other
Optional
Execution 92ms
Transfer 117 KB
Unused 50%
Monthly Cost £2/mo
static.chartbeat.com
Other
Optional
Execution 53ms
Transfer 16 KB
Monthly Cost £1/mo

These scripts may cost more than they're worth

  • static.files.bbci.co.uk adds 967ms and costs ~£17/month
  • Unattributable adds 263ms and costs ~£5/month
  • cdn.tinypass.com adds 214ms and costs ~£4/month
  • static.files.bbci.co.uk adds 213ms and costs ~£4/month

82% 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 967ms 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 263ms 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

cdn.tinypass.com takes 214ms 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

53% 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

static.files.bbci.co.uk takes 213ms 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.

Send Feedback