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

Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
80
GRADE
B
FIX
2
REVIEW
4
PASS
6
INFO
2

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

Mobile Desktop
46
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
90
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.
77
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.

4.82 s

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

7.70 s

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

692 ms

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

0.005

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

4.82 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.

9.05 s

Page Load Progression

375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 s
Checks
14
6 PASS 4 REVIEW 2 FIX
D
Third-Party Impact
Action
89% third-party, 0 ms blocking
FIX
89% third-party, 0 ms blocking
Warning::
Third-party code accounts for 89% of page weight (1.1 MiB of 1.2 MiB)
Info::
Third-party blocking time is low (0 ms)
89%
First-party Third-party
F
JS Execution Cost
Action
5448ms total JS execution
FIX
5448ms total JS execution
Warning::
https://www.theguardian.com/international: 1836ms CPU time
Warning::
Unattributable: 994ms CPU time
Warning::
https://sourcepoint.theguardian.com/Notice.8f529.j...: 894ms CPU time
Warning::
https://assets.guim.co.uk/assets/index.client.web....: 640ms CPU time
Warning::
https://sourcepoint.theguardian.com/unified/wrappe...: 274ms CPU time
Warning::
Third-party scripts: 3612ms (66% of total)

Main Thread Breakdown

Script Evaluation 40% Style & Layout 24% Other 21% Parse HTML & CSS 8% Script Parsing & Compilation 4% Rendering 3%
ScriptTotalScriptingParse/CompileParty
https://www.theguardian.com/international1836ms55ms13ms1st
Unattributable994ms67ms0ms3rd
https://sourcepoint.theguardian.com/Notice.8f529.js894ms579ms50ms3rd
https://assets.guim.co.uk/assets/index.client.web.18dee422f56822d692d5.js640ms439ms1ms3rd
https://sourcepoint.theguardian.com/unified/wrapperMessagingWithoutDetection.js274ms200ms19ms3rd
https://assets.guim.co.uk/assets/Metrics-island.client.web.89d0611e576844a15b71.js211ms207ms1ms3rd
https://assets.guim.co.uk/assets/0.client.web.9123216163237343ed91.js156ms141ms15ms3rd
https://assets.guim.co.uk/assets/Titlepiece-island.client.web.ff2455b029191d3f4985.js146ms137ms9ms3rd
https://assets.guim.co.uk/assets/frameworks.client.web.8844a1b3ccdb9ca9be92.js108ms58ms1ms3rd
https://assets.guim.co.uk/assets/StickyBottomBanner-island.client.web.cec82945865a29ee6676.js108ms105ms2ms3rd

Showing top 10 of 11 scripts

B
Page Weight Budget
1.2 MB transferred, 110 requests
REVIEW
1.2 MB transferred, 110 requests
Info::
Page weighs 3.7 MB (1.2 MB transferred)
Warning::
110 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.26 g CO2 per page load
1.2 MB / 2.4 MB budget
1.2 MB transferred
110 requests
0.26 g CO2 per page load
Images 501.8 KiB 39%
JavaScript 402.3 KiB 31%
Fonts 185.8 KiB 15%
HTML 139.4 KiB 11%
Other 23.4 KiB 2%
Other 11.1 KiB 1%
Other 7.5 KiB 1%
CSS 7.3 KiB 1%
Other 822 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Under budget

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

C
JS Bundles
Action
51 scripts, 237 KB unused
REVIEW
51 scripts, 237 KB unused
Warning::
https://sourcepoint.theguardian.com/Notice.8f529.j...: 61 KB unused (68%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://assets.guim.co.uk/assets/index.client.web....: 54 KB unused (32%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://assets.guim.co.uk/assets/index.client.web....: 54 KB unused (32%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://assets.guim.co.uk/commercial/4209b0b7fab4c...: 34 KB unused (61%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://assets.guim.co.uk/commercial/4209b0b7fab4c...: 34 KB unused (61%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 237 KB
237 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://sourcepoint.theguardian.com/Notice.8f529.js91 KB61 KB (68%)✓3rd
https://assets.guim.co.uk/assets/index.client.web.18dee422f56822d692d5.js0 KB54 KB (32%)✓3rd
https://assets.guim.co.uk/assets/index.client.web.18dee422f56822d692d5.js48 KB54 KB (32%)✓3rd
https://assets.guim.co.uk/commercial/4209b0b7fab4ca3f32ab/graun.standalone.commercial.js0 KB34 KB (61%)✓3rd
https://assets.guim.co.uk/commercial/4209b0b7fab4ca3f32ab/graun.standalone.commercial.js17 KB34 KB (61%)✓3rd
https://assets.guim.co.uk/assets/339.client.web.5dad519b798ade886449.js3 KB—✓3rd
https://assets.guim.co.uk/assets/4071.client.web.133281cf398676725383.js3 KB—✓3rd
https://assets.guim.co.uk/polyfill.io/v3/polyfill.min.js?rum=0&features=es6%2Ces7%2Ces2017%2Ces2018%2Ces2019%2Cdefault-3.6%2CHTMLPictureElement%2CIntersectionObserver%2CIntersectionObserverEntry%2CURLSearchParams%2Cfetch%2CNodeList.prototype.forEach%2Cnavigator.sendBeacon%2Cperformance.now%2CPromise.allSettled&flags=gated&callback=guardianPolyfilled&unknown=polyfill&cacheClear=10 KB—✓3rd
https://assets.guim.co.uk/assets/frameworks.client.web.8844a1b3ccdb9ca9be92.js0 KB—✓3rd
https://assets.guim.co.uk/assets/4355.client.web.c2a2dac32cea7e268621.js1 KB—✓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
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

B
HTTP Caching
max-age=0
REVIEW
max-age=0
Info::
Cache-Control header is set
Got: max-age=0
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=0

DirectiveValueMeaning
max-age0Cache for 0 seconds
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+
Image Optimization
25 images, 0 KB saveable
PASS
25 images, 0 KB saveable
Info::
All images are well-optimized
25 images 502 KB
0 oversized -0 KB
0 legacy format
0 missing dimensions CLS risk
A+
Font Loading
8 fonts (186 KB)
PASS
8 fonts (186 KB)
Info::
8 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

8

186 KB total

Render-blocking

0

of 8

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s FCP 4.8 s LCP 7.7 shttps://assets.guim.co.uk/static/frontend/fonts/guardian-headline/noalts-not-hinted/GHGuardianHeadline-Bold.woff2GHGuardianHeadline-Bold... https://assets.guim.co.uk/static/frontend/fonts/guardian-headline/noalts-not-hinted/GHGuardianHeadline-Bold.woff2 — 17.0 KiB — 0 ms — font-display: swaphttps://assets.guim.co.uk/static/frontend/fonts/guardian-textegyptian/noalts-not-hinted/GuardianTextEgyptian-Regular.woff2GuardianTextEgyptian-Re... https://assets.guim.co.uk/static/frontend/fonts/guardian-textegyptian/noalts-not-hinted/GuardianTextEgyptian-Regular.woff2 — 17.3 KiB — 0 ms — font-display: swaphttps://assets.guim.co.uk/static/frontend/fonts/guardian-textsans/noalts-not-hinted/GuardianTextSans-Regular.woff2GuardianTextSans-Regula... https://assets.guim.co.uk/static/frontend/fonts/guardian-textsans/noalts-not-hinted/GuardianTextSans-Regular.woff2 — 15.9 KiB — 0 ms — font-display: swaphttps://assets.guim.co.uk/static/frontend/fonts/guardian-textsans/noalts-not-hinted/GuardianTextSans-Bold.woff2GuardianTextSans-Bold.w... https://assets.guim.co.uk/static/frontend/fonts/guardian-textsans/noalts-not-hinted/GuardianTextSans-Bold.woff2 — 17.9 KiB — 0 ms — font-display: swaphttps://assets.guim.co.uk/static/frontend/fonts/guardian-headline/noalts-not-hinted/GHGuardianHeadline-Medium.woff2GHGuardianHeadline-Medi... https://assets.guim.co.uk/static/frontend/fonts/guardian-headline/noalts-not-hinted/GHGuardianHeadline-Medium.woff2 — 17.1 KiB — 0 ms — font-display: swaphttps://interactive.guim.co.uk/fonts/garnett/GTGuardianTitlepiece-Bold.woff2GTGuardianTitlepiece-Bo... https://interactive.guim.co.uk/fonts/garnett/GTGuardianTitlepiece-Bold.woff2 — 26.1 KiB — 0 ms — font-display: swaphttps://interactive.guim.co.uk/fonts/guss-webfonts/GuardianTextSansWeb/GuardianTextSansWeb-Regular.woff2GuardianTextSansWeb-Reg... https://interactive.guim.co.uk/fonts/guss-webfonts/GuardianTextSansWeb/GuardianTextSansWeb-Regular.woff2 — 35.7 KiB — 0 ms — font-display: swaphttps://interactive.guim.co.uk/fonts/guss-webfonts/GuardianTextSansWeb/GuardianTextSansWeb-Bold.woff2GuardianTextSansWeb-Bol... https://interactive.guim.co.uk/fonts/guss-webfonts/GuardianTextSansWeb/GuardianTextSansWeb-Bold.woff2 — 38.8 KiB — 0 ms — font-display: swap
GHGuardianHeadline-Bold... woff2 swap
Size 17 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
GuardianTextEgyptian-Re... woff2 swap
Size 17 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
GuardianTextSans-Regula... woff2 swap
Size 16 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
GuardianTextSans-Bold.w... woff2 swap
Size 18 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
GHGuardianHeadline-Medi... woff2 swap
Size 17 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
GTGuardianTitlepiece-Bo... woff2 swap
Size 26 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
GuardianTextSansWeb-Reg... woff2 swap
Size 36 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
GuardianTextSansWeb-Bol... woff2 swap
Size 39 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
16 hints, 0 missing preconnects
PASS
16 hints, 0 missing preconnects
Info::
Page uses 16 resource hint(s)

Current Resource Hints

preconnect
5
preload
2
dns-prefetch
9
prefetch
—

16 resource hints configured

Network Waterfall
110 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
66% of JavaScript execution is third-party
First-party Third-party 3612ms · 247KB · €19/mo
Unattributable
Other
Costly
Execution 994ms
Transfer 0 KB
Monthly Cost €5/mo
sourcepoint.theguardian.com
Other
Costly
Execution 894ms
Transfer 91 KB
Unused 68%
Monthly Cost €5/mo
assets.guim.co.uk
Other
Costly
Execution 640ms
Transfer 48 KB
Unused 32%
Monthly Cost €3/mo
sourcepoint.theguardian.com
Other
Costly
Execution 274ms
Transfer 42 KB
Monthly Cost €1/mo
assets.guim.co.uk
Other
Costly
Execution 211ms
Transfer 4 KB
Monthly Cost €1/mo
assets.guim.co.uk
Other
Optional
Execution 156ms
Transfer 13 KB
Monthly Cost €1/mo
assets.guim.co.uk
Other
Optional
Execution 146ms
Transfer 13 KB
Monthly Cost €1/mo
assets.guim.co.uk
Other
Optional
Execution 108ms
Transfer 0 KB
Monthly Cost €1/mo
assets.guim.co.uk
Other
Optional
Execution 108ms
Transfer 7 KB
Monthly Cost €1/mo
sourcepoint.theguardian.com
Other
Optional
Execution 81ms
Transfer 29 KB
Monthly Cost €0/mo

These scripts may cost more than they're worth

  • Unattributable adds 994ms and costs ~€5/month
  • sourcepoint.theguardian.com adds 894ms and costs ~€5/month
  • assets.guim.co.uk adds 640ms and costs ~€3/month
  • sourcepoint.theguardian.com adds 274ms and costs ~€1/month
  • assets.guim.co.uk adds 211ms and costs ~€1/month

66% of JavaScript execution time comes from third-party scripts.

Why this matters

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 994ms 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

sourcepoint.theguardian.com takes 894ms 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

68% of sourcepoint.theguardian.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

assets.guim.co.uk takes 640ms 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

sourcepoint.theguardian.com takes 274ms 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

assets.guim.co.uk takes 211ms 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