Performance
· 25 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.
4.91 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
7.99 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
556 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.016
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
4.91 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.
8.86 s
Page Load Progression
DThird-Party ImpactAction86% third-party, 0 ms blockingFIX
FJS Execution CostAction4367ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.theguardian.com/international | 1240ms | 41ms | 11ms | 1st |
| https://sourcepoint.theguardian.com/Notice.b4712.js | 918ms | 585ms | 48ms | 3rd |
| Unattributable | 802ms | 10ms | 0ms | 3rd |
| https://assets.guim.co.uk/assets/index.client.web.de6f83cc1d33c894266a.js | 397ms | 365ms | 1ms | 3rd |
| https://sourcepoint.theguardian.com/unified/wrapperMessagingWithoutDetection.js | 285ms | 225ms | 21ms | 3rd |
| https://assets.guim.co.uk/assets/Metrics-island.client.web.a76a7485e0aad868e34a.js | 236ms | 231ms | 1ms | 3rd |
| https://assets.guim.co.uk/assets/0.client.web.fcf0e994afa8386c9dd1.js | 154ms | 139ms | 14ms | 3rd |
| https://assets.guim.co.uk/assets/Titlepiece-island.client.web.9ec4f934363cb29976ef.js | 146ms | 138ms | 8ms | 3rd |
| https://assets.guim.co.uk/assets/1958.client.web.a05ac43a9aff7a0f2fd8.js | 115ms | 105ms | 9ms | 3rd |
| https://sourcepoint.theguardian.com/unified/4.40.1/gdpr-tcf.27718c8cb9d29947d2c1.bundle.js | 75ms | 52ms | 22ms | 3rd |
CJS BundlesAction48 scripts, 239 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://sourcepoint.theguardian.com/Notice.b4712.js | 93 KB | 62 KB (68%) | ✓ | 3rd |
| https://assets.guim.co.uk/assets/index.client.web.de6f83cc1d33c894266a.js | 47 KB | 54 KB (32%) | ✓ | 3rd |
| https://assets.guim.co.uk/assets/index.client.web.de6f83cc1d33c894266a.js | 0 KB | 54 KB (32%) | ✓ | 3rd |
| https://assets.guim.co.uk/commercial/866ff7c3703314d6cbd7/graun.standalone.commercial.js | 17 KB | 34 KB (61%) | ✓ | 3rd |
| https://assets.guim.co.uk/commercial/866ff7c3703314d6cbd7/graun.standalone.commercial.js | 0 KB | 34 KB (61%) | ✓ | 3rd |
| https://assets.guim.co.uk/assets/Titlepiece-island.client.web.9ec4f934363cb29976ef.js | 13 KB | — | ✓ | 3rd |
| https://sourcepoint.theguardian.com/polyfills.01516.js | 2 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
CCompression AlgorithmActionMain response served uncompressedREVIEW
BServer-Timing ObservabilityNo Server-Timing header foundREVIEW
BPage Weight Inventory100 resources · 971 KB · 239 KB savings availableREVIEW
~238.9 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 100 resources | 970.9 KiB | ||||||
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
BHTTP Cachingmax-age=0REVIEW
max-age=0
| Directive | Value | Meaning |
|---|---|---|
| max-age | 0 | Cache for 0 seconds |
APage Weight Budget971 KB transferred, 100 requestsPASS
A+Text CompressionAll text resources are compressedPASS
AImage Optimization19 images, 0 KB saveablePASS
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
A+Font Loading8 fonts (186 KB)PASS
Web fonts
8
186 KB total
Render-blocking
0
of 8
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
AResource Hints16 hints, 0 missing preconnectsPASS
Current Resource Hints
16 resource hints configured
preconnect already does the DNS lookup; adding dns-prefetch to the same origin is at best a no-op. Sample: https://assets.guim.co.uk, https://i.guim.co.uk, https://j.ophan.co.uk (+1 more). Remove the redundant dns-prefetch entries.
Performance issues directly impact user engagement and conversion rates.
The same href shouldn't appear in multiple hint rels -- one wins, the others are wasted markup and may confuse cache behavior. Sample: https://ophan.theguardian.com (preconnect+dns-prefetch), https://assets.guim.co.uk/ (preconnect+dns-prefetch), https://i.guim.co.uk (preconnect+dns-prefetch) (+1 more).
Performance issues directly impact user engagement and conversion rates.
A+HTTP/3 (QUIC)HTTP/3 advertised via Alt-SvcPASS
A+LCP Image PreloadLCP preload audit not availablePASS
A+Main HTML Cache-ControlMain HTML max-age=0 (≤ 5min) is appropriatePASS
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
AJavaScript Blocking1 JS blocking issue(s) detectedPASS
Network Waterfall100 requests over 1456msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
sourcepoint.theguardian.com sourcepoint.theguardian.com | Other | 918ms | 93 KB | 68% | €5/mo | Costly |
Unattributable Unattributable | Other | 802ms | 0 KB | — | €4/mo | Costly |
assets.guim.co.uk assets.guim.co.uk | Other | 397ms | 0 KB | 32% | €2/mo | Costly |
sourcepoint.theguardian.com sourcepoint.theguardian.com | Other | 285ms | 42 KB | — | €2/mo | Costly |
assets.guim.co.uk assets.guim.co.uk | Other | 236ms | 4 KB | — | €1/mo | Costly |
assets.guim.co.uk assets.guim.co.uk | Other | 154ms | 13 KB | — | €1/mo | Optional |
assets.guim.co.uk assets.guim.co.uk | Other | 146ms | 13 KB | — | €1/mo | Optional |
assets.guim.co.uk assets.guim.co.uk | Other | 115ms | 21 KB | — | €1/mo | Optional |
sourcepoint.theguardian.com sourcepoint.theguardian.com | Other | 75ms | 29 KB | — | €0/mo | Optional |
These scripts may cost more than they're worth
- sourcepoint.theguardian.com adds 918ms and costs ~€5/month
- Unattributable adds 802ms and costs ~€4/month
- assets.guim.co.uk adds 397ms and costs ~€2/month
- sourcepoint.theguardian.com adds 285ms and costs ~€2/month
- assets.guim.co.uk adds 236ms and costs ~€1/month
72% 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
sourcepoint.theguardian.com takes 918ms 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
68% 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
Unattributable takes 802ms 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
assets.guim.co.uk takes 397ms 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
sourcepoint.theguardian.com takes 285ms 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
assets.guim.co.uk takes 236ms 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
Real-User Performance (CrUX)Field metrics from the Chrome User Experience ReportINFO
Chrome User Experience (CrUX)
Real-user metrics from the Chrome UX Report (2026-04-10 — 2026-05-07)
LCP (p75)
925 ms
95% good
INP (p75)
104 ms
91% good
CLS (p75)
0.050
82% good
FCP (p75)
757 ms
TTFB (p75)
355 ms
Image Optimization109 images, 90 KB total, 0 KB wastedINFO
Image Optimization Audit
Total Images
109
Total Size
90 KB
Oversized
1