Performance
· 22 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.
671 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
783 ms
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
37 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.001
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
1.12 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.
923 ms
Page Load Progression
DThird-Party ImpactAction86% third-party, 0 ms blockingFIX
CJS Execution CostAction1157ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.theguardian.com/international | 486ms | 9ms | 3ms | 1st |
| Unattributable | 200ms | 2ms | 0ms | 3rd |
| https://sourcepoint.theguardian.com/Notice.b4712.js | 197ms | 146ms | 12ms | 3rd |
| https://assets.guim.co.uk/assets/index.client.web.de6f83cc1d33c894266a.js | 114ms | 104ms | 0ms | 3rd |
| https://sourcepoint.theguardian.com/unified/wrapperMessagingWithoutDetection.js | 93ms | 62ms | 8ms | 3rd |
| https://assets.guim.co.uk/assets/frameworks.client.web.8844a1b3ccdb9ca9be92.js | 66ms | 55ms | 0ms | 3rd |
CJS BundlesAction47 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/5606.client.web.e0e480f7186470542bae.js | 1 KB | — | ✓ | 3rd |
| https://assets.guim.co.uk/assets/6799.client.web.2a5999814561bfc1149b.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
CCompression AlgorithmActionMain response served uncompressedREVIEW
BServer-Timing ObservabilityNo Server-Timing header foundREVIEW
BPage Weight Inventory101 resources · 979 KB · 239 KB savings availableREVIEW
~238.9 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 101 resources | 978.7 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 Budget979 KB transferred, 101 requestsPASS
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
A+Text CompressionAll text resources are compressedPASS
AImage Optimization21 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 (185 KB)PASS
Web fonts
8
185 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
A+Resource HintsNo optimization neededPASS
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
Network Waterfall101 requests over 1774msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Unattributable Unattributable | Other | 200ms | 0 KB | — | €1/mo | Costly |
sourcepoint.theguardian.com sourcepoint.theguardian.com | Other | 197ms | 93 KB | 68% | €1/mo | Optional |
assets.guim.co.uk assets.guim.co.uk | Other | 114ms | 0 KB | 32% | €1/mo | Optional |
sourcepoint.theguardian.com sourcepoint.theguardian.com | Other | 93ms | 42 KB | — | €0/mo | Optional |
assets.guim.co.uk assets.guim.co.uk | Other | 66ms | 0 KB | — | €0/mo | Optional |
These scripts may cost more than they're worth
- Unattributable adds 200ms and costs ~€1/month
58% of JavaScript execution time comes from third-party scripts.
Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.
Learn more ▾ ▴
Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.
Source: web.dev / HTTP Archive Web Almanac
Unattributable takes 200ms 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
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