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Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
80
GRADE
B
FIX
1
REVIEW
5
PASS
6
INFO
2

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

Mobile Desktop
98
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
94
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.

698 ms

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

827 ms

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

20 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.

1.11 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.

881 ms

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 5 REVIEW 1 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 1.3 MiB)
Info::
Third-party blocking time is low (0 ms)
89%
First-party Third-party
B
Page Weight Budget
1.3 MB transferred, 111 requests
REVIEW
1.3 MB transferred, 111 requests
Info::
Page weighs 3.7 MB (1.3 MB transferred)
Warning::
111 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.27 g CO2 per page load
1.3 MB / 2.4 MB budget
1.3 MB transferred
111 requests
0.27 g CO2 per page load
Images 520.0 KiB 40%
JavaScript 402.3 KiB 31%
Fonts 185.7 KiB 14%
HTML 139.4 KiB 11%
Other 23.4 KiB 2%
Other 11.1 KiB 1%
Other 7.5 KiB 1%
CSS 7.4 KiB 1%
Other 610 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 Execution Cost
Action
1180ms total JS execution
REVIEW
1180ms total JS execution
Warning::
https://www.theguardian.com/international: 445ms CPU time
Info::
Unattributable: 219ms CPU time
Info::
https://sourcepoint.theguardian.com/Notice.8f529.j...: 197ms CPU time
Info::
https://assets.guim.co.uk/assets/frameworks.client...: 121ms CPU time
Info::
https://assets.guim.co.uk/assets/index.client.web....: 108ms CPU time
Warning::
Third-party scripts: 735ms (62% of total)

Main Thread Breakdown

Script Evaluation 39% Style & Layout 22% Other 21% Parse HTML & CSS 8% Rendering 5% Script Parsing & Compilation 4%
ScriptTotalScriptingParse/CompileParty
https://www.theguardian.com/international445ms8ms3ms1st
Unattributable219ms14ms0ms3rd
https://sourcepoint.theguardian.com/Notice.8f529.js197ms144ms12ms3rd
https://assets.guim.co.uk/assets/frameworks.client.web.8844a1b3ccdb9ca9be92.js121ms57ms0ms3rd
https://assets.guim.co.uk/assets/index.client.web.18dee422f56822d692d5.js108ms95ms0ms3rd
https://sourcepoint.theguardian.com/unified/wrapperMessagingWithoutDetection.js91ms55ms5ms3rd
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.js47 KB54 KB (32%)✓3rd
https://assets.guim.co.uk/assets/index.client.web.18dee422f56822d692d5.js0 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/Titlepiece-island.client.web.ff2455b029191d3f4985.js13 KB—✓3rd
https://assets.guim.co.uk/assets/TopBar-island.client.web.d1a6448275c665fbd64b.js5 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/4355.client.web.c2a2dac32cea7e268621.js1 KB—✓3rd
https://assets.guim.co.uk/assets/7557.client.web.57a630c9e7e2da9aa003.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
26 images, 0 KB saveable
PASS
26 images, 0 KB saveable
Info::
All images are well-optimized
26 images 520 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 500 ms 1.0 s FCP 698 ms LCP 827 mshttps://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 — 17.8 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 — 35.6 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
111 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
62% of JavaScript execution is third-party
First-party Third-party 735ms · 181KB · €4/mo
Unattributable
Other
Costly
Execution 219ms
Transfer 0 KB
Monthly Cost €1/mo
sourcepoint.theguardian.com
Other
Optional
Execution 197ms
Transfer 91 KB
Unused 68%
Monthly Cost €1/mo
assets.guim.co.uk
Other
Optional
Execution 121ms
Transfer 0 KB
Monthly Cost €1/mo
assets.guim.co.uk
Other
Optional
Execution 108ms
Transfer 47 KB
Unused 32%
Monthly Cost €1/mo
sourcepoint.theguardian.com
Other
Optional
Execution 91ms
Transfer 42 KB
Monthly Cost €0/mo

These scripts may cost more than they're worth

  • Unattributable adds 219ms and costs ~€1/month

62% 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 219ms 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

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.

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