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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
83
GRADE
B
FIX
2
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.

898 ms

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

974 ms

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

5 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.

898 ms

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

1.79 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
15
6 PASS 5 REVIEW 2 FIX
D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (1.3 MiB of 1.3 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

B
Page Weight Budget
1.3 MB transferred, 115 requests
REVIEW
1.3 MB transferred, 115 requests
Info::
Page weighs 3.6 MB (1.3 MB transferred)
Info::
Fonts are 246 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 246 KB
Warning::
115 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
1.3 MB / 2.4 MB budget
1.3 MB transferred
115 requests
0.26 g CO2 per page load
Images 447.7 KiB 35%
JavaScript 390.3 KiB 30%
Fonts 246.4 KiB 19%
HTML 142.5 KiB 11%
Other 23.4 KiB 2%
Other 18.3 KiB 1%
CSS 7.3 KiB 1%
Other 4.7 KiB 0%
Other 802 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Under budget

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

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.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

Source: web.dev

B
JS Execution Cost
574ms total JS execution
REVIEW
574ms total JS execution
Info::
https://www.theguardian.com/europe: 240ms CPU time
Info::
https://sourcepoint.theguardian.com/Notice.8f529.j...: 137ms CPU time
Info::
Unattributable: 128ms CPU time
Info::
https://assets.guim.co.uk/assets/index.client.web....: 69ms CPU time
Warning::
Third-party scripts: 574ms (100% of total)

Main Thread Breakdown

Script Evaluation 43% Style & Layout 21% Other 19% Parse HTML & CSS 8% Rendering 4% Script Parsing & Compilation 3%
ScriptTotalScriptingParse/CompileParty
https://www.theguardian.com/europe240ms6ms2ms3rd
https://sourcepoint.theguardian.com/Notice.8f529.js137ms102ms7ms3rd
Unattributable128ms2ms0ms3rd
https://assets.guim.co.uk/assets/index.client.web.66e12bd4606d8a6d9464.js69ms63ms0ms3rd
C
JS Bundles
Action
48 scripts, 237 KB unused
REVIEW
48 scripts, 237 KB unused
Warning::
https://sourcepoint.theguardian.com/Notice.8f529.j...: 61 KB unused (67%)
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/c4a3aa217acf2...: 34 KB unused (61%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://assets.guim.co.uk/commercial/c4a3aa217acf2...: 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 (67%)✓3rd
https://assets.guim.co.uk/assets/index.client.web.66e12bd4606d8a6d9464.js47 KB54 KB (32%)✓3rd
https://assets.guim.co.uk/assets/index.client.web.66e12bd4606d8a6d9464.js0 KB54 KB (32%)✓3rd
https://assets.guim.co.uk/commercial/c4a3aa217acf2823bf3c/graun.standalone.commercial.js17 KB34 KB (61%)✓3rd
https://assets.guim.co.uk/commercial/c4a3aa217acf2823bf3c/graun.standalone.commercial.js0 KB34 KB (61%)✓3rd
https://assets.guim.co.uk/assets/Titlepiece-island.client.web.ff2455b029191d3f4985.js13 KB—✓3rd
https://assets.guim.co.uk/assets/SlideshowCarousel-island.client.web.264a07eea4938f719ab1.js5 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
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
Page Weight Inventory
Action
115 resources · 1.3 MB · 237 KB savings available
REVIEW
115 resources · 1.3 MB · 237 KB savings available
Warning::
Page weight 258 KB over 1MB target
Got: 1.3 MB Expected: ≤ 1 MB
Info::
~237 KB of savings available
Warning::
114 third-party resources (100% of weight)
115 resources · 1.3 MiB · 114 third-party 257.5 KiB over 1MB target
Image 35% · 449.4 KiB
JavaScript 32% · 410.8 KiB
Font 19% · 246.4 KiB
Document 11% · 142.5 KiB
Other 2% · 25.1 KiB
CSS 1% · 7.3 KiB

~237.3 KiB of savings available

Remove unused JavaScript: 237.3 KiB
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

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
31 images, 0 KB saveable
PASS
31 images, 0 KB saveable
Info::
All images are well-optimized
31 images 448 KB
0 oversized -0 KB
3 legacy format
0 missing dimensions CLS risk
A+
Font Loading
10 fonts (246 KB)
PASS
10 fonts (246 KB)
Info::
10 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

10

246 KB total

Render-blocking

0

of 10

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s FCP 898 ms LCP 974 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 — 20 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 — 16.7 KiB — 20 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 — 10 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 — 13 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 — 15 ms — font-display: swaphttps://interactive.guim.co.uk/fonts/guss-webfonts/GHGuardianHeadline/GHGuardianHeadline-Bold.woff2GHGuardianHeadline-Bold... https://interactive.guim.co.uk/fonts/guss-webfonts/GHGuardianHeadline/GHGuardianHeadline-Bold.woff2 — 16.6 KiB — 8 ms — font-display: swaphttps://interactive.guim.co.uk/fonts/guss-webfonts/GuardianTextEgyptianWeb/GuardianTextEgyptianWeb-Regular.woff2GuardianTextEgyptianWeb... https://interactive.guim.co.uk/fonts/guss-webfonts/GuardianTextEgyptianWeb/GuardianTextEgyptianWeb-Regular.woff2 — 34.9 KiB — 6 ms — font-display: swaphttps://interactive.guim.co.uk/fonts/guss-webfonts/GuardianTextEgyptianWeb/GuardianTextEgyptianWeb-Bold.woff2GuardianTextEgyptianWeb... https://interactive.guim.co.uk/fonts/guss-webfonts/GuardianTextEgyptianWeb/GuardianTextEgyptianWeb-Bold.woff2 — 36.1 KiB — 6 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 — 35.3 KiB — 6 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 — 6 ms — font-display: swap
GHGuardianHeadline-Bold... woff2 swap
Size 17 KB
Load time 20 ms
Start 50 ms
Risk FOUT — text flashes from fallback to web font
GuardianTextEgyptian-Re... woff2 swap
Size 17 KB
Load time 20 ms
Start 50 ms
Risk FOUT — text flashes from fallback to web font
GuardianTextSans-Regula... woff2 swap
Size 16 KB
Load time 10 ms
Start 173 ms
Risk FOUT — text flashes from fallback to web font
GuardianTextSans-Bold.w... woff2 swap
Size 18 KB
Load time 13 ms
Start 174 ms
Risk FOUT — text flashes from fallback to web font
GHGuardianHeadline-Medi... woff2 swap
Size 17 KB
Load time 15 ms
Start 174 ms
Risk FOUT — text flashes from fallback to web font
GHGuardianHeadline-Bold... woff2 swap
Size 17 KB
Load time 8 ms
Start 641 ms
Risk FOUT — text flashes from fallback to web font
GuardianTextEgyptianWeb... woff2 swap
Size 35 KB
Load time 6 ms
Start 641 ms
Risk FOUT — text flashes from fallback to web font
GuardianTextEgyptianWeb... woff2 swap
Size 36 KB
Load time 6 ms
Start 641 ms
Risk FOUT — text flashes from fallback to web font
GuardianTextSansWeb-Reg... woff2 swap
Size 35 KB
Load time 6 ms
Start 641 ms
Risk FOUT — text flashes from fallback to web font
GuardianTextSansWeb-Bol... woff2 swap
Size 39 KB
Load time 6 ms
Start 642 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
115 requests over 1004ms
INFO
0 ms 500 ms 1.0 s FCP 898 ms LCP 974 mshttps://theguardian.com// https://theguardian.com/ — 301 — 187 B — 4 ms — h2https://www.theguardian.com/www.theguardian.com/ https://www.theguardian.com/ — 302 — 1.1 KiB — 3 ms — h2https://www.theguardian.com/europewww.theguardian.com/europe https://www.theguardian.com/europe — 200 — 140.2 KiB — 26 ms — h2https://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=1assets.guim.co.uk/polyfill.io/v3/po... 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=1 — 200 — 672 B — 9 ms — h2https://assets.guim.co.uk/assets/frameworks.client.web.8844a1b3ccdb9ca9be92.jsassets.guim.co.uk/assets/frameworks... https://assets.guim.co.uk/assets/frameworks.client.web.8844a1b3ccdb9ca9be92.js — 200 — 19.8 KiB — 7 ms — h2https://assets.guim.co.uk/static/frontend/fonts/guardian-headline/noalts-not-hinted/GHGuardianHeadline-Bold.woff2assets.guim.co.uk/static/frontend/f... https://assets.guim.co.uk/static/frontend/fonts/guardian-headline/noalts-not-hinted/GHGuardianHeadline-Bold.woff2 — 200 — 17.0 KiB — 20 ms — h2https://assets.guim.co.uk/static/frontend/fonts/guardian-textegyptian/noalts-not-hinted/GuardianTextEgyptian-Regular.woff2assets.guim.co.uk/static/frontend/f... https://assets.guim.co.uk/static/frontend/fonts/guardian-textegyptian/noalts-not-hinted/GuardianTextEgyptian-Regular.woff2 — 200 — 16.7 KiB — 20 ms — h2https://assets.guim.co.uk/assets/frameworks.client.web.8844a1b3ccdb9ca9be92.jsassets.guim.co.uk/assets/frameworks... https://assets.guim.co.uk/assets/frameworks.client.web.8844a1b3ccdb9ca9be92.js — 200 — 0 B — 12 ms — h2https://assets.guim.co.uk/assets/index.client.web.66e12bd4606d8a6d9464.jsassets.guim.co.uk/assets/index.clie... https://assets.guim.co.uk/assets/index.client.web.66e12bd4606d8a6d9464.js — 200 — 47.5 KiB — 21 ms — h2https://i.guim.co.uk/img/media/3f927e5bc4dda79b24c7bf9396fb2b857ad6d08a/0_0_3919_3136/master/3919.jpg?width=98&dpr=1&s=none&crop=1%3A1i.guim.co.uk/img/media/3f927e5bc4dd... https://i.guim.co.uk/img/media/3f927e5bc4dda79b24c7bf9396fb2b857ad6d08a/0_0_3919_3136/master/3919.jpg?width=98&dpr=1&s=none&crop=1%3A1 — 200 — 3.3 KiB — 7 ms — h2https://i.guim.co.uk/img/uploads/2017/10/09/Rafael-Behr,-L.png?width=98&dpr=1&s=none&crop=1%3A1i.guim.co.uk/img/uploads/2017/10/09... https://i.guim.co.uk/img/uploads/2017/10/09/Rafael-Behr,-L.png?width=98&dpr=1&s=none&crop=1%3A1 — 200 — 3.0 KiB — 4 ms — h2https://i.guim.co.uk/img/media/adf48d850ed4ce6eeba2ebf39c4088d916301bbb/2515_745_1384_1384/master/1384.jpg?width=98&dpr=1&s=none&crop=1%3A1i.guim.co.uk/img/media/adf48d850ed4... https://i.guim.co.uk/img/media/adf48d850ed4ce6eeba2ebf39c4088d916301bbb/2515_745_1384_1384/master/1384.jpg?width=98&dpr=1&s=none&crop=1%3A1 — 200 — 2.0 KiB — 19 ms — h2https://i.guim.co.uk/img/media/cd5756057db5a2c657c06cb14f53af463b4e67b0/792_39_4489_3591/master/4489.jpg?width=98&dpr=1&s=none&crop=1%3A1i.guim.co.uk/img/media/cd5756057db5... https://i.guim.co.uk/img/media/cd5756057db5a2c657c06cb14f53af463b4e67b0/792_39_4489_3591/master/4489.jpg?width=98&dpr=1&s=none&crop=1%3A1 — 200 — 3.8 KiB — 15 ms — h2https://i.guim.co.uk/img/media/d6743fb044cc0b5ef49bda09835133563b6a2b68/1_0_2999_2400/master/2999.jpg?width=98&dpr=1&s=none&crop=1%3A1i.guim.co.uk/img/media/d6743fb044cc... https://i.guim.co.uk/img/media/d6743fb044cc0b5ef49bda09835133563b6a2b68/1_0_2999_2400/master/2999.jpg?width=98&dpr=1&s=none&crop=1%3A1 — 200 — 2.3 KiB — 9 ms — h2https://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=1assets.guim.co.uk/polyfill.io/v3/po... 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=1 — 200 — 0 B — 15 ms — h2https://assets.guim.co.uk/commercial/c4a3aa217acf2823bf3c/graun.standalone.commercial.jsassets.guim.co.uk/commercial/c4a3aa... https://assets.guim.co.uk/commercial/c4a3aa217acf2823bf3c/graun.standalone.commercial.js — 200 — 16.8 KiB — 10 ms — h2https://i.guim.co.uk/img/uploads/2017/10/06/Arwa_Mahdawi,_L.png?width=98&dpr=1&s=none&crop=1%3A1i.guim.co.uk/img/uploads/2017/10/06... https://i.guim.co.uk/img/uploads/2017/10/06/Arwa_Mahdawi,_L.png?width=98&dpr=1&s=none&crop=1%3A1 — 200 — 2.8 KiB — 18 ms — h2https://i.guim.co.uk/img/media/b71e057d3e56ad3999ca877688055342f1405020/268_0_3080_2464/master/3080.jpg?width=620&dpr=1&s=none&crop=5%3A4i.guim.co.uk/img/media/b71e057d3e56... https://i.guim.co.uk/img/media/b71e057d3e56ad3999ca877688055342f1405020/268_0_3080_2464/master/3080.jpg?width=620&dpr=1&s=none&crop=5%3A4 — 200 — 50.7 KiB — 16 ms — h2https://i.guim.co.uk/img/media/2a4cd2e5bcd905b1a3342e8494baba283482994e/654_0_3333_2667/master/3333.jpg?width=460&dpr=1&s=none&crop=5%3A4i.guim.co.uk/img/media/2a4cd2e5bcd9... https://i.guim.co.uk/img/media/2a4cd2e5bcd905b1a3342e8494baba283482994e/654_0_3333_2667/master/3333.jpg?width=460&dpr=1&s=none&crop=5%3A4 — 200 — 26.8 KiB — 12 ms — h2https://assets.guim.co.uk/assets/index.client.web.66e12bd4606d8a6d9464.jsassets.guim.co.uk/assets/index.clie... https://assets.guim.co.uk/assets/index.client.web.66e12bd4606d8a6d9464.js — 200 — 0 B — 28 ms — h2https://assets.guim.co.uk/commercial/c4a3aa217acf2823bf3c/graun.standalone.commercial.jsassets.guim.co.uk/commercial/c4a3aa... https://assets.guim.co.uk/commercial/c4a3aa217acf2823bf3c/graun.standalone.commercial.js — 200 — 0 B — 18 ms — h2https://static.theguardian.com/commercial/sponsor/07/Oct/2025/d7f61ec6-06a9-4463-9169-825189e7c601-iberdrola_horizontal.pngstatic.theguardian.com/commercial/s... https://static.theguardian.com/commercial/sponsor/07/Oct/2025/d7f61ec6-06a9-4463-9169-825189e7c601-iberdrola_horizontal.png — 200 — 10.4 KiB — 9 ms — h2https://assets.guim.co.uk/static/frontend/css/print.cssassets.guim.co.uk/static/frontend/c... https://assets.guim.co.uk/static/frontend/css/print.css — 200 — 618 B — 32 ms — h2https://i.guim.co.uk/img/media/b07c52ec4792a36b49f5c062e6598cb5bbf60f5e/2279_968_2433_1946/master/2433.jpg?width=220&dpr=1&s=none&crop=5%3A4i.guim.co.uk/img/media/b07c52ec4792... https://i.guim.co.uk/img/media/b07c52ec4792a36b49f5c062e6598cb5bbf60f5e/2279_968_2433_1946/master/2433.jpg?width=220&dpr=1&s=none&crop=5%3A4 — 200 — 8.2 KiB — 9 ms — h2https://i.guim.co.uk/img/media/f2ed3ed01c5002b937f31cf73a44d6c80281fa24/861_107_4867_3893/master/4867.jpg?width=220&dpr=1&s=none&crop=5%3A4i.guim.co.uk/img/media/f2ed3ed01c50... https://i.guim.co.uk/img/media/f2ed3ed01c5002b937f31cf73a44d6c80281fa24/861_107_4867_3893/master/4867.jpg?width=220&dpr=1&s=none&crop=5%3A4 — 200 — 4.5 KiB — 12 ms — h2https://i.guim.co.uk/img/media/7092b4b076ecde7a62439a3048e194c0b1eee2a8/690_0_5600_4480/master/5600.jpg?width=460&dpr=1&s=none&crop=5%3A4i.guim.co.uk/img/media/7092b4b076ec... https://i.guim.co.uk/img/media/7092b4b076ecde7a62439a3048e194c0b1eee2a8/690_0_5600_4480/master/5600.jpg?width=460&dpr=1&s=none&crop=5%3A4 — 200 — 31.4 KiB — 12 ms — h2https://i.guim.co.uk/img/media/5a81e516197be11e982c1357d965d6b510d5892d/187_0_3433_2747/master/3433.jpg?width=220&dpr=1&s=none&crop=5%3A4i.guim.co.uk/img/media/5a81e516197b... https://i.guim.co.uk/img/media/5a81e516197be11e982c1357d965d6b510d5892d/187_0_3433_2747/master/3433.jpg?width=220&dpr=1&s=none&crop=5%3A4 — 200 — 6.2 KiB — 9 ms — h2https://i.guim.co.uk/img/media/806c5300e2399fe424ae580ffb136ca3729be5a5/182_0_2537_2031/master/2537.jpg?width=220&dpr=1&s=none&crop=5%3A4i.guim.co.uk/img/media/806c5300e239... https://i.guim.co.uk/img/media/806c5300e2399fe424ae580ffb136ca3729be5a5/182_0_2537_2031/master/2537.jpg?width=220&dpr=1&s=none&crop=5%3A4 — 200 — 9.6 KiB — 9 ms — h2https://i.guim.co.uk/img/media/9d61a8b016cdaa0c171b1d156a1942b0ca0cc0ee/1092_364_3432_2744/master/3432.jpg?width=220&dpr=1&s=none&crop=5%3A4i.guim.co.uk/img/media/9d61a8b016cd... https://i.guim.co.uk/img/media/9d61a8b016cdaa0c171b1d156a1942b0ca0cc0ee/1092_364_3432_2744/master/3432.jpg?width=220&dpr=1&s=none&crop=5%3A4 — 200 — 10.9 KiB — 9 ms — h2https://i.guim.co.uk/img/media/7011c07c31d6c4c1253f1439025b892921694a93/701_0_4743_3797/master/4743.jpg?width=220&dpr=1&s=none&crop=5%3A4i.guim.co.uk/img/media/7011c07c31d6... https://i.guim.co.uk/img/media/7011c07c31d6c4c1253f1439025b892921694a93/701_0_4743_3797/master/4743.jpg?width=220&dpr=1&s=none&crop=5%3A4 — 200 — 7.7 KiB — 8 ms — h2
0 ms 500 ms 1.0 s FCP 898 ms LCP 974 mshttps://theguardian.com// https://theguardian.com/ — 301 — 187 B — 4 ms — h2https://www.theguardian.com/www.theguardian.com/ https://www.theguardian.com/ — 302 — 1.1 KiB — 3 ms — h2https://www.theguardian.com/europewww.theguardian.com/europe https://www.theguardian.com/europe — 200 — 140.2 KiB — 26 ms — h2https://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=1assets.guim.co.uk/polyfill.io/v3/po... 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=1 — 200 — 672 B — 9 ms — h2https://assets.guim.co.uk/assets/frameworks.client.web.8844a1b3ccdb9ca9be92.jsassets.guim.co.uk/assets/frameworks... https://assets.guim.co.uk/assets/frameworks.client.web.8844a1b3ccdb9ca9be92.js — 200 — 19.8 KiB — 7 ms — h2https://assets.guim.co.uk/static/frontend/fonts/guardian-headline/noalts-not-hinted/GHGuardianHeadline-Bold.woff2assets.guim.co.uk/static/frontend/f... https://assets.guim.co.uk/static/frontend/fonts/guardian-headline/noalts-not-hinted/GHGuardianHeadline-Bold.woff2 — 200 — 17.0 KiB — 20 ms — h2https://assets.guim.co.uk/static/frontend/fonts/guardian-textegyptian/noalts-not-hinted/GuardianTextEgyptian-Regular.woff2assets.guim.co.uk/static/frontend/f... https://assets.guim.co.uk/static/frontend/fonts/guardian-textegyptian/noalts-not-hinted/GuardianTextEgyptian-Regular.woff2 — 200 — 16.7 KiB — 20 ms — h2https://assets.guim.co.uk/assets/frameworks.client.web.8844a1b3ccdb9ca9be92.jsassets.guim.co.uk/assets/frameworks... https://assets.guim.co.uk/assets/frameworks.client.web.8844a1b3ccdb9ca9be92.js — 200 — 0 B — 12 ms — h2https://assets.guim.co.uk/assets/index.client.web.66e12bd4606d8a6d9464.jsassets.guim.co.uk/assets/index.clie... https://assets.guim.co.uk/assets/index.client.web.66e12bd4606d8a6d9464.js — 200 — 47.5 KiB — 21 ms — h2https://i.guim.co.uk/img/media/3f927e5bc4dda79b24c7bf9396fb2b857ad6d08a/0_0_3919_3136/master/3919.jpg?width=98&dpr=1&s=none&crop=1%3A1i.guim.co.uk/img/media/3f927e5bc4dd... https://i.guim.co.uk/img/media/3f927e5bc4dda79b24c7bf9396fb2b857ad6d08a/0_0_3919_3136/master/3919.jpg?width=98&dpr=1&s=none&crop=1%3A1 — 200 — 3.3 KiB — 7 ms — h2https://i.guim.co.uk/img/uploads/2017/10/09/Rafael-Behr,-L.png?width=98&dpr=1&s=none&crop=1%3A1i.guim.co.uk/img/uploads/2017/10/09... https://i.guim.co.uk/img/uploads/2017/10/09/Rafael-Behr,-L.png?width=98&dpr=1&s=none&crop=1%3A1 — 200 — 3.0 KiB — 4 ms — h2https://i.guim.co.uk/img/media/adf48d850ed4ce6eeba2ebf39c4088d916301bbb/2515_745_1384_1384/master/1384.jpg?width=98&dpr=1&s=none&crop=1%3A1i.guim.co.uk/img/media/adf48d850ed4... https://i.guim.co.uk/img/media/adf48d850ed4ce6eeba2ebf39c4088d916301bbb/2515_745_1384_1384/master/1384.jpg?width=98&dpr=1&s=none&crop=1%3A1 — 200 — 2.0 KiB — 19 ms — h2https://i.guim.co.uk/img/media/cd5756057db5a2c657c06cb14f53af463b4e67b0/792_39_4489_3591/master/4489.jpg?width=98&dpr=1&s=none&crop=1%3A1i.guim.co.uk/img/media/cd5756057db5... https://i.guim.co.uk/img/media/cd5756057db5a2c657c06cb14f53af463b4e67b0/792_39_4489_3591/master/4489.jpg?width=98&dpr=1&s=none&crop=1%3A1 — 200 — 3.8 KiB — 15 ms — h2https://i.guim.co.uk/img/media/d6743fb044cc0b5ef49bda09835133563b6a2b68/1_0_2999_2400/master/2999.jpg?width=98&dpr=1&s=none&crop=1%3A1i.guim.co.uk/img/media/d6743fb044cc... https://i.guim.co.uk/img/media/d6743fb044cc0b5ef49bda09835133563b6a2b68/1_0_2999_2400/master/2999.jpg?width=98&dpr=1&s=none&crop=1%3A1 — 200 — 2.3 KiB — 9 ms — h2https://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=1assets.guim.co.uk/polyfill.io/v3/po... 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=1 — 200 — 0 B — 15 ms — h2https://assets.guim.co.uk/commercial/c4a3aa217acf2823bf3c/graun.standalone.commercial.jsassets.guim.co.uk/commercial/c4a3aa... https://assets.guim.co.uk/commercial/c4a3aa217acf2823bf3c/graun.standalone.commercial.js — 200 — 16.8 KiB — 10 ms — h2https://i.guim.co.uk/img/uploads/2017/10/06/Arwa_Mahdawi,_L.png?width=98&dpr=1&s=none&crop=1%3A1i.guim.co.uk/img/uploads/2017/10/06... https://i.guim.co.uk/img/uploads/2017/10/06/Arwa_Mahdawi,_L.png?width=98&dpr=1&s=none&crop=1%3A1 — 200 — 2.8 KiB — 18 ms — h2https://i.guim.co.uk/img/media/b71e057d3e56ad3999ca877688055342f1405020/268_0_3080_2464/master/3080.jpg?width=620&dpr=1&s=none&crop=5%3A4i.guim.co.uk/img/media/b71e057d3e56... https://i.guim.co.uk/img/media/b71e057d3e56ad3999ca877688055342f1405020/268_0_3080_2464/master/3080.jpg?width=620&dpr=1&s=none&crop=5%3A4 — 200 — 50.7 KiB — 16 ms — h2https://i.guim.co.uk/img/media/2a4cd2e5bcd905b1a3342e8494baba283482994e/654_0_3333_2667/master/3333.jpg?width=460&dpr=1&s=none&crop=5%3A4i.guim.co.uk/img/media/2a4cd2e5bcd9... https://i.guim.co.uk/img/media/2a4cd2e5bcd905b1a3342e8494baba283482994e/654_0_3333_2667/master/3333.jpg?width=460&dpr=1&s=none&crop=5%3A4 — 200 — 26.8 KiB — 12 ms — h2https://assets.guim.co.uk/assets/index.client.web.66e12bd4606d8a6d9464.jsassets.guim.co.uk/assets/index.clie... https://assets.guim.co.uk/assets/index.client.web.66e12bd4606d8a6d9464.js — 200 — 0 B — 28 ms — h2https://assets.guim.co.uk/commercial/c4a3aa217acf2823bf3c/graun.standalone.commercial.jsassets.guim.co.uk/commercial/c4a3aa... https://assets.guim.co.uk/commercial/c4a3aa217acf2823bf3c/graun.standalone.commercial.js — 200 — 0 B — 18 ms — h2https://static.theguardian.com/commercial/sponsor/07/Oct/2025/d7f61ec6-06a9-4463-9169-825189e7c601-iberdrola_horizontal.pngstatic.theguardian.com/commercial/s... https://static.theguardian.com/commercial/sponsor/07/Oct/2025/d7f61ec6-06a9-4463-9169-825189e7c601-iberdrola_horizontal.png — 200 — 10.4 KiB — 9 ms — h2https://assets.guim.co.uk/static/frontend/css/print.cssassets.guim.co.uk/static/frontend/c... https://assets.guim.co.uk/static/frontend/css/print.css — 200 — 618 B — 32 ms — h2https://i.guim.co.uk/img/media/b07c52ec4792a36b49f5c062e6598cb5bbf60f5e/2279_968_2433_1946/master/2433.jpg?width=220&dpr=1&s=none&crop=5%3A4i.guim.co.uk/img/media/b07c52ec4792... https://i.guim.co.uk/img/media/b07c52ec4792a36b49f5c062e6598cb5bbf60f5e/2279_968_2433_1946/master/2433.jpg?width=220&dpr=1&s=none&crop=5%3A4 — 200 — 8.2 KiB — 9 ms — h2https://i.guim.co.uk/img/media/f2ed3ed01c5002b937f31cf73a44d6c80281fa24/861_107_4867_3893/master/4867.jpg?width=220&dpr=1&s=none&crop=5%3A4i.guim.co.uk/img/media/f2ed3ed01c50... https://i.guim.co.uk/img/media/f2ed3ed01c5002b937f31cf73a44d6c80281fa24/861_107_4867_3893/master/4867.jpg?width=220&dpr=1&s=none&crop=5%3A4 — 200 — 4.5 KiB — 12 ms — h2https://i.guim.co.uk/img/media/7092b4b076ecde7a62439a3048e194c0b1eee2a8/690_0_5600_4480/master/5600.jpg?width=460&dpr=1&s=none&crop=5%3A4i.guim.co.uk/img/media/7092b4b076ec... https://i.guim.co.uk/img/media/7092b4b076ecde7a62439a3048e194c0b1eee2a8/690_0_5600_4480/master/5600.jpg?width=460&dpr=1&s=none&crop=5%3A4 — 200 — 31.4 KiB — 12 ms — h2https://i.guim.co.uk/img/media/5a81e516197be11e982c1357d965d6b510d5892d/187_0_3433_2747/master/3433.jpg?width=220&dpr=1&s=none&crop=5%3A4i.guim.co.uk/img/media/5a81e516197b... https://i.guim.co.uk/img/media/5a81e516197be11e982c1357d965d6b510d5892d/187_0_3433_2747/master/3433.jpg?width=220&dpr=1&s=none&crop=5%3A4 — 200 — 6.2 KiB — 9 ms — h2https://i.guim.co.uk/img/media/806c5300e2399fe424ae580ffb136ca3729be5a5/182_0_2537_2031/master/2537.jpg?width=220&dpr=1&s=none&crop=5%3A4i.guim.co.uk/img/media/806c5300e239... https://i.guim.co.uk/img/media/806c5300e2399fe424ae580ffb136ca3729be5a5/182_0_2537_2031/master/2537.jpg?width=220&dpr=1&s=none&crop=5%3A4 — 200 — 9.6 KiB — 9 ms — h2https://i.guim.co.uk/img/media/9d61a8b016cdaa0c171b1d156a1942b0ca0cc0ee/1092_364_3432_2744/master/3432.jpg?width=220&dpr=1&s=none&crop=5%3A4i.guim.co.uk/img/media/9d61a8b016cd... https://i.guim.co.uk/img/media/9d61a8b016cdaa0c171b1d156a1942b0ca0cc0ee/1092_364_3432_2744/master/3432.jpg?width=220&dpr=1&s=none&crop=5%3A4 — 200 — 10.9 KiB — 9 ms — h2https://i.guim.co.uk/img/media/7011c07c31d6c4c1253f1439025b892921694a93/701_0_4743_3797/master/4743.jpg?width=220&dpr=1&s=none&crop=5%3A4i.guim.co.uk/img/media/7011c07c31d6... https://i.guim.co.uk/img/media/7011c07c31d6c4c1253f1439025b892921694a93/701_0_4743_3797/master/4743.jpg?width=220&dpr=1&s=none&crop=5%3A4 — 200 — 7.7 KiB — 8 ms — h2https://i.guim.co.uk/img/uploads/2017/10/06/Arwa_Mahdawi,_L.png?width=150&dpr=1&s=none&crop=1%3A1i.guim.co.uk/img/uploads/2017/10/06... https://i.guim.co.uk/img/uploads/2017/10/06/Arwa_Mahdawi,_L.png?width=150&dpr=1&s=none&crop=1%3A1 — 200 — 4.4 KiB — 7 ms — h2https://i.guim.co.uk/img/uploads/2026/04/15/Tibor_Dessewffy.png?width=150&dpr=1&s=none&crop=1%3A1i.guim.co.uk/img/uploads/2026/04/15... 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https://sourcepoint.theguardian.com/consent/tcfv2/vendor-list/categories?siteId=7417 — 200 — 1.1 KiB — 6 ms — h3https://assets.guim.co.uk/assets/4501.client.web.ae17c42ee373d0271f91.jsassets.guim.co.uk/assets/4501.clien... https://assets.guim.co.uk/assets/4501.client.web.ae17c42ee373d0271f91.js — 200 — 4.5 KiB — 2 ms — h3https://sourcepoint.theguardian.com/consent/tcfv2/vendor-list/categories?siteId=7417&consentLanguage=ensourcepoint.theguardian.com/consent... https://sourcepoint.theguardian.com/consent/tcfv2/vendor-list/categories?siteId=7417&consentLanguage=en — 200 — 1.1 KiB — 4 ms — h3https://media.guim.co.uk/8c1c22e152b853e10ff3e1511aa2da58ee04351b/0_0_512_512/512.pngmedia.guim.co.uk/8c1c22e152b853e10f... https://media.guim.co.uk/8c1c22e152b853e10ff3e1511aa2da58ee04351b/0_0_512_512/512.png — 200 — 23.0 KiB — 4 ms — h2https://media.guim.co.uk/843ea07704db2a72afc0f835b7b2d4beafc189df/0_0_512_512/140.jpgmedia.guim.co.uk/843ea07704db2a72af... 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https://assets.guim.co.uk/assets/AdmiralScript-island.client.web.94f4a734a51f1eadf47c.js — 200 — 2.5 KiB — 5 ms — h3https://static.guim.co.uk/images/favicon-32x32.icostatic.guim.co.uk/images/favicon-32... https://static.guim.co.uk/images/favicon-32x32.ico — 200 — 828 B — 14 ms — h2https://assets.guim.co.uk/assets/FocusStyles-island.client.web.7db1d7271ae21ac55511.jsassets.guim.co.uk/assets/FocusStyle... https://assets.guim.co.uk/assets/FocusStyles-island.client.web.7db1d7271ae21ac55511.js — 200 — 1.1 KiB — 6 ms — h3https://assets.guim.co.uk/static/frontend/icons/homescreen/roundel.svgassets.guim.co.uk/static/frontend/i... https://assets.guim.co.uk/static/frontend/icons/homescreen/roundel.svg — 200 — 875 B — 8 ms — h3https://assets.guim.co.uk/assets/ShowHideContainers-island.client.web.5ad428e0d06ccd49fafd.jsassets.guim.co.uk/assets/ShowHideCo... https://assets.guim.co.uk/assets/ShowHideContainers-island.client.web.5ad428e0d06ccd49fafd.js — 200 — 1.3 KiB — 8 ms — 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h3https://ophan.theguardian.com/img/2?viewId=mo0nkspjg0ur0d33zr2u&adUnitWasHidden=falseophan.theguardian.com/img/2?viewId=... https://ophan.theguardian.com/img/2?viewId=mo0nkspjg0ur0d33zr2u&adUnitWasHidden=false — 204 — 214 B — 38 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
100% of JavaScript execution is third-party
First-party Third-party 574ms · 231KB · €3/mo
www.theguardian.com
Other
Costly
Execution 240ms
Transfer 140 KB
Monthly Cost €1/mo
sourcepoint.theguardian.com
Other
Optional
Execution 137ms
Transfer 91 KB
Unused 67%
Monthly Cost €1/mo
Unattributable
Other
Optional
Execution 128ms
Transfer 0 KB
Monthly Cost €1/mo
assets.guim.co.uk
Other
Optional
Execution 69ms
Transfer 0 KB
Unused 32%
Monthly Cost €0/mo

These scripts may cost more than they're worth

  • www.theguardian.com adds 240ms and costs ~€1/month

100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

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

www.theguardian.com takes 240ms 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

67% 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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