Performance
· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
902 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
995 ms
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
10 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.002
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
964 ms
Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.
1.80 s
Page Load Progression
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BPage Weight Budget1.1 MB transferred, 116 requestsREVIEW
Subset fonts to include only used characters, or switch to system font stacks.
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.
High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.
Source: web.dev
BJS Execution Cost831ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.theguardian.com/europe | 289ms | 12ms | 2ms | 3rd |
| Unattributable | 171ms | 2ms | 0ms | 3rd |
| https://sourcepoint.theguardian.com/Notice.8f529.js | 163ms | 120ms | 8ms | 3rd |
| https://assets.guim.co.uk/assets/index.client.web.41c60e6d892cea9b2d71.js | 89ms | 81ms | 0ms | 3rd |
| https://sourcepoint.theguardian.com/unified/wrapperMessagingWithoutDetection.js | 64ms | 42ms | 3ms | 3rd |
| https://assets.guim.co.uk/assets/frameworks.client.web.8844a1b3ccdb9ca9be92.js | 57ms | 45ms | 0ms | 3rd |
CJS BundlesAction47 scripts, 237 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://sourcepoint.theguardian.com/Notice.8f529.js | 91 KB | 61 KB (67%) | ✓ | 3rd |
| https://assets.guim.co.uk/assets/index.client.web.41c60e6d892cea9b2d71.js | 47 KB | 54 KB (33%) | ✓ | 3rd |
| https://assets.guim.co.uk/assets/index.client.web.41c60e6d892cea9b2d71.js | 0 KB | 54 KB (33%) | ✓ | 3rd |
| https://assets.guim.co.uk/commercial/d7e6114c4ac417b6e43d/graun.standalone.commercial.js | 17 KB | 34 KB (61%) | ✓ | 3rd |
| https://assets.guim.co.uk/commercial/d7e6114c4ac417b6e43d/graun.standalone.commercial.js | 0 KB | 34 KB (61%) | ✓ | 3rd |
| https://assets.guim.co.uk/assets/3576.client.web.99e63b3f2fd2d08bc84f.js | 4 KB | — | ✓ | 3rd |
| https://assets.guim.co.uk/assets/6647.client.web.048f159fdd25d0b6a5cd.js | 3 KB | — | ✓ | 3rd |
| https://assets.guim.co.uk/assets/frameworks.client.web.8844a1b3ccdb9ca9be92.js | 0 KB | — | ✓ | 3rd |
| https://assets.guim.co.uk/assets/4355.client.web.c2a2dac32cea7e268621.js | 1 KB | — | ✓ | 3rd |
| https://assets.guim.co.uk/assets/7557.client.web.57a630c9e7e2da9aa003.js | 1 KB | — | ✓ | 3rd |
Consider code splitting or tree shaking to reduce unused code.
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.
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.
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.
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.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
BPage Weight Inventory116 resources · 1.1 MB · 237 KB savings availableREVIEW
~237.3 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 116 resources | 1.1 MiB | ||||||
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
A+Text CompressionAll text resources are compressedPASS
AImage Optimization33 images, 0 KB saveablePASS
A+Font Loading10 fonts (247 KB)PASS
Web fonts
10
247 KB total
Render-blocking
0
of 10
Dominant font-display
swap
Most common across fonts
Font loading timeline
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 CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
Network Waterfall116 requests over 1260msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.theguardian.com www.theguardian.com | Other | 289ms | 137 KB | — | £2/mo | Costly |
Unattributable Unattributable | Other | 171ms | 0 KB | — | £1/mo | Optional |
sourcepoint.theguardian.com sourcepoint.theguardian.com | Other | 163ms | 91 KB | 67% | £1/mo | Optional |
assets.guim.co.uk assets.guim.co.uk | Other | 89ms | 0 KB | 33% | £0/mo | Optional |
sourcepoint.theguardian.com sourcepoint.theguardian.com | Other | 64ms | 42 KB | — | £0/mo | Optional |
assets.guim.co.uk assets.guim.co.uk | Other | 57ms | 0 KB | — | £0/mo | Optional |
These scripts may cost more than they're worth
- www.theguardian.com adds 289ms and costs ~£2/month
100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.
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.theguardian.com takes 289ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
67% of sourcepoint.theguardian.com's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev