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.
2.72 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
4.29 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
619 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.009
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
2.72 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.
8.64 s
Page Load Progression
DThird-Party ImpactAction87% third-party, 0 ms blockingFIX
DJS Execution CostAction3174ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.theguardian.com/europe | 1064ms | 18ms | 6ms | 1st |
| Unattributable | 582ms | 6ms | 0ms | 3rd |
| https://sourcepoint.theguardian.com/Notice.b4712.js | 548ms | 417ms | 24ms | 3rd |
| https://assets.guim.co.uk/assets/index.client.web.de6f83cc1d33c894266a.js | 275ms | 251ms | 1ms | 3rd |
| https://sourcepoint.theguardian.com/unified/wrapperMessagingWithoutDetection.js | 239ms | 165ms | 10ms | 3rd |
| https://assets.guim.co.uk/assets/frameworks.client.web.8844a1b3ccdb9ca9be92.js | 229ms | 174ms | 0ms | 3rd |
| https://assets.guim.co.uk/assets/0.client.web.fcf0e994afa8386c9dd1.js | 88ms | 80ms | 7ms | 3rd |
| https://assets.guim.co.uk/assets/Titlepiece-island.client.web.9ec4f934363cb29976ef.js | 78ms | 74ms | 4ms | 3rd |
| https://assets.guim.co.uk/assets/5461.client.web.014f2c4706ab9fe19c2e.js | 71ms | 68ms | 3ms | 3rd |
BPage Weight Budget1.1 MB transferred, 105 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
CJS BundlesAction48 scripts, 238 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 (67%) | ✓ | 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://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 Inventory105 resources · 1.1 MB · 238 KB savings availableREVIEW
~238.4 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 105 resources | 1.1 MiB | ||||||
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 |
A+Text CompressionAll text resources are compressedPASS
AImage Optimization22 images, 0 KB saveablePASS
A+Font Loading10 fonts (246 KB)PASS
Web fonts
10
246 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
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://assets.guim.co.uk/ (preconnect+dns-prefetch), https://i.guim.co.uk (preconnect+dns-prefetch), https://j.ophan.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
A+JavaScript BlockingNo render-blocking JS or document.write usage detectedPASS
Network Waterfall105 requests over 1125msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Unattributable Unattributable | Other | 582ms | 0 KB | — | €3/mo | Costly |
sourcepoint.theguardian.com sourcepoint.theguardian.com | Other | 548ms | 93 KB | 67% | €3/mo | Costly |
assets.guim.co.uk assets.guim.co.uk | Other | 275ms | 0 KB | 32% | €1/mo | Costly |
sourcepoint.theguardian.com sourcepoint.theguardian.com | Other | 239ms | 42 KB | — | €1/mo | Costly |
assets.guim.co.uk assets.guim.co.uk | Other | 229ms | 0 KB | — | €1/mo | Costly |
assets.guim.co.uk assets.guim.co.uk | Other | 88ms | 13 KB | — | €0/mo | Optional |
assets.guim.co.uk assets.guim.co.uk | Other | 78ms | 13 KB | — | €0/mo | Optional |
assets.guim.co.uk assets.guim.co.uk | Other | 71ms | 10 KB | — | €0/mo | Optional |
These scripts may cost more than they're worth
- Unattributable adds 582ms and costs ~€3/month
- sourcepoint.theguardian.com adds 548ms and costs ~€3/month
- assets.guim.co.uk adds 275ms and costs ~€1/month
- sourcepoint.theguardian.com adds 239ms and costs ~€1/month
- assets.guim.co.uk adds 229ms and costs ~€1/month
66% 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 582ms 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 548ms 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
assets.guim.co.uk takes 275ms 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 239ms 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 229ms 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 Optimization114 images, 92 KB total, 0 KB wastedINFO
Image Optimization Audit
Total Images
114
Total Size
92 KB
Oversized
1