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https://nice.org.uk

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
85
GRADE
B
FIX
3
REVIEW
3
PASS
7
INFO
2

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

Mobile Desktop
87
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
97
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.
100
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.

1.10 s

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

2.12 s

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

40 ms

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

0.014

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

1.10 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.

2.66 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
7 PASS 3 REVIEW 3 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 (1.5 MiB of 1.5 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
44 resources · 1.5 MB · 255 KB savings available
FIX
44 resources · 1.5 MB · 255 KB savings available
Warning::
Page weight 475 KB over 1MB target
Got: 1.5 MB Expected: ≤ 1 MB
Info::
~255 KB of savings available
Warning::
43 third-party resources (100% of weight)
44 resources · 1.5 MiB · 43 third-party 474.6 KiB over 1MB target
JavaScript 47% · 703.7 KiB
Image 43% · 642.6 KiB
Font 6% · 85.5 KiB
Document 3% · 37.7 KiB
CSS 2% · 25.0 KiB
Other 0% · 4.0 KiB

~254.6 KiB of savings available

Remove unused JavaScript: 254.6 KiB
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
1.5 MB transferred, 44 requests
REVIEW
1.5 MB transferred, 44 requests
Info::
Page weighs 3.2 MB (1.5 MB transferred)
Warning::
JavaScript is 702 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 702 KB
Info::
44 HTTP requests
Info::
Estimated 0.31 g CO2 per page load
1.5 MB / 2.4 MB budget
1.5 MB transferred
44 requests
0.31 g CO2 per page load
JavaScript 702.0 KiB 47%
Images 631.8 KiB 42%
Fonts 85.5 KiB 6%
HTML 37.6 KiB 3%
CSS 25.0 KiB 2%
Other 12.5 KiB 1%
Other 3.4 KiB 0%
Other 614 B 0%
0 2.4 MB 4.9 MB
Under budget

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

C
JS Bundles
Action
15 scripts, 255 KB unused
REVIEW
15 scripts, 255 KB unused
Warning::
https://www.nice.org.uk/_next/static/chunks/pages/...: 76 KB unused (56%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-M55...: 69 KB unused (37%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-Z92E...: 67 KB unused (39%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.nice.org.uk/cookie-banner/cookie-banne...: 42 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 255 KB
255 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.nice.org.uk/_next/static/chunks/pages/_app-3bb779198370a52c.js138 KB76 KB (56%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-M55QTQ188 KB69 KB (37%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-Z92EPYYZ1S&cx=c&gtm=4e64h1170 KB67 KB (39%)✓3rd
https://cdn.nice.org.uk/cookie-banner/cookie-banner.min.js98 KB42 KB (43%)✓3rd
https://www.nice.org.uk/_next/static/chunks/main-433b6987f8bc2715.js39 KB—✓3rd
https://www.nice.org.uk/_next/static/chunks/pages/index-1769b8558930820e.js2 KB—✓3rd
https://www.nice.org.uk/_next/static/JYiAEwKteutv8bhP49exe/_buildManifest.js4 KB—✓3rd
https://www.nice.org.uk/_next/static/JYiAEwKteutv8bhP49exe/_ssgManifest.js1 KB—✓3rd
https://accounts.nice.org.uk/tophat?91504934601 KB—✓3rd
https://www.nice.org.uk/_next/static/chunks/framework-945b357d4a851f4b.js45 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

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
13 images, 0 KB saveable
PASS
13 images, 0 KB saveable
Info::
All images are well-optimized
13 images 632 KB
0 oversized -0 KB
2 legacy format
0 missing dimensions CLS risk
A+
JS Execution Cost
457ms total JS execution
PASS
457ms total JS execution
Info::
https://cdn.nice.org.uk/cookie-banner/cookie-banne...: 150ms CPU time
Info::
https://www.nice.org.uk/_next/static/chunks/main-4...: 100ms CPU time
Info::
Unattributable: 80ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-Z92E...: 68ms CPU time
Info::
https://www.nice.org.uk/: 59ms CPU time
Warning::
Third-party scripts: 457ms (100% of total)

Main Thread Breakdown

Script Evaluation 62% Other 17% Script Parsing & Compilation 9% Style & Layout 7%
ScriptTotalScriptingParse/CompileParty
https://cdn.nice.org.uk/cookie-banner/cookie-banner.min.js150ms130ms7ms3rd
https://www.nice.org.uk/_next/static/chunks/main-433b6987f8bc2715.js100ms95ms3ms3rd
Unattributable80ms2ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-Z92EPYYZ1S&cx=c&gtm=4e64h168ms57ms11ms3rd
https://www.nice.org.uk/59ms1ms0ms3rd
A+
Font Loading
2 fonts (86 KB)
PASS
2 fonts (86 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

86 KB total

Render-blocking

0

of 2

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.1 s LCP 2.1 shttps://www.nice.org.uk/_next/static/media/e4af272ccee01ff0-s.p.woff2e4af272ccee01ff0-s.p.woff2 https://www.nice.org.uk/_next/static/media/e4af272ccee01ff0-s.p.woff2 — 48.0 KiB — 143 ms — font-display: swaphttps://www.nice.org.uk/_next/static/media/5c0c2bcbaa4149ca-s.p.woff25c0c2bcbaa4149ca-s.p.woff2 https://www.nice.org.uk/_next/static/media/5c0c2bcbaa4149ca-s.p.woff2 — 37.6 KiB — 98 ms — font-display: swap
e4af272ccee01ff0-s.p.woff2 woff2 swap
Size 48 KB
Load time 143 ms
Start 232 ms
Risk FOUT — text flashes from fallback to web font
5c0c2bcbaa4149ca-s.p.woff2 woff2 swap
Size 38 KB
Load time 98 ms
Start 232 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
44 requests over 1061ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.1 s LCP 2.1 shttps://nice.org.uk// https://nice.org.uk/ — 301 — 85 B — 107 ms — h2https://www.nice.org.uk/www.nice.org.uk/ https://www.nice.org.uk/ — 200 — 35.9 KiB — 161 ms — h2https://cdn.nice.org.uk/cookie-banner/cookie-banner.min.jscdn.nice.org.uk/cookie-banner/cooki... https://cdn.nice.org.uk/cookie-banner/cookie-banner.min.js — 200 — 97.8 KiB — 15 ms — h2https://www.nice.org.uk/_next/static/media/e4af272ccee01ff0-s.p.woff2www.nice.org.uk/_next/static/media/... https://www.nice.org.uk/_next/static/media/e4af272ccee01ff0-s.p.woff2 — 200 — 48.0 KiB — 143 ms — h2https://www.nice.org.uk/_next/static/media/5c0c2bcbaa4149ca-s.p.woff2www.nice.org.uk/_next/static/media/... https://www.nice.org.uk/_next/static/media/5c0c2bcbaa4149ca-s.p.woff2 — 200 — 37.6 KiB — 98 ms — h2https://www.nice.org.uk/_next/static/css/efc4877ac94d4d56.csswww.nice.org.uk/_next/static/css/ef... https://www.nice.org.uk/_next/static/css/efc4877ac94d4d56.css — 200 — 24.1 KiB — 65 ms — h2https://www.nice.org.uk/_next/static/chunks/webpack-e9b7aebf236fe0ad.jswww.nice.org.uk/_next/static/chunks... https://www.nice.org.uk/_next/static/chunks/webpack-e9b7aebf236fe0ad.js — 200 — 2.8 KiB — 128 ms — h2https://www.nice.org.uk/_next/static/chunks/framework-945b357d4a851f4b.jswww.nice.org.uk/_next/static/chunks... https://www.nice.org.uk/_next/static/chunks/framework-945b357d4a851f4b.js — 200 — 44.8 KiB — 138 ms — h2https://www.nice.org.uk/_next/static/chunks/main-433b6987f8bc2715.jswww.nice.org.uk/_next/static/chunks... https://www.nice.org.uk/_next/static/chunks/main-433b6987f8bc2715.js — 200 — 39.5 KiB — 138 ms — h2https://www.nice.org.uk/_next/static/chunks/pages/_app-3bb779198370a52c.jswww.nice.org.uk/_next/static/chunks... https://www.nice.org.uk/_next/static/chunks/pages/_app-3bb779198370a52c.js — 200 — 138.3 KiB — 145 ms — h2https://www.nice.org.uk/_next/static/chunks/pages/index-1769b8558930820e.jswww.nice.org.uk/_next/static/chunks... https://www.nice.org.uk/_next/static/chunks/pages/index-1769b8558930820e.js — 200 — 1.6 KiB — 127 ms — h2https://www.nice.org.uk/_next/static/JYiAEwKteutv8bhP49exe/_buildManifest.jswww.nice.org.uk/_next/static/JYiAEw... https://www.nice.org.uk/_next/static/JYiAEwKteutv8bhP49exe/_buildManifest.js — 200 — 3.6 KiB — 137 ms — h2https://www.nice.org.uk/_next/static/JYiAEwKteutv8bhP49exe/_ssgManifest.jswww.nice.org.uk/_next/static/JYiAEw... https://www.nice.org.uk/_next/static/JYiAEwKteutv8bhP49exe/_ssgManifest.js — 200 — 883 B — 137 ms — h2https://i.ytimg.com/vi_webp/lqo8lr4Erok/hqdefault.webpi.ytimg.com/vi_webp/lqo8lr4Erok/hqd... https://i.ytimg.com/vi_webp/lqo8lr4Erok/hqdefault.webp — 200 — 8.0 KiB — 82 ms — h2https://registry.blockmarktech.com/certificates/99cdb154-4ee0-41a4-bdef-6d2fa58bf757/widget/?tooltip_position=bottom_left&theme=transparent&hover=tregistry.blockmarktech.com/certific... https://registry.blockmarktech.com/certificates/99cdb154-4ee0-41a4-bdef-6d2fa58bf757/widget/?tooltip_position=bottom_left&theme=transparent&hover=t — 200 — 1.7 KiB — 81 ms — h2https://apikeys.civiccomputing.com/c/v?d=www.nice.org.uk&p=CookieControl%20Multi-Site&v=9&k=843970763414bd3ac1229c12767f5e7fab9ef68c&format=jsonapikeys.civiccomputing.com/c/v?d=ww... https://apikeys.civiccomputing.com/c/v?d=www.nice.org.uk&p=CookieControl%20Multi-Site&v=9&k=843970763414bd3ac1229c12767f5e7fab9ef68c&format=json — 200 — 614 B — 27 ms — h3https://storage.googleapis.com/static-bm-cdn/static/widget/widget_2.cssstorage.googleapis.com/static-bm-cd... https://storage.googleapis.com/static-bm-cdn/static/widget/widget_2.css — 200 — 944 B — 80 ms — h2https://storage.googleapis.com/blockmark-cdn/uploaded-user-content/templates/128bc7f8-f6fc-4277-b708-e07c7ca9e768/image_2025-05-29_101823.3940220000_600x600_q85_padding_upscale.png?X-Goog-Algorithm=GOOG4-RSA-SHA256&X-Goog-Credential=application-server-test%40delta-essence-234612.iam.gserviceaccount.com%2F20260421%2Fauto%2Fstorage%2Fgoog4_request&X-Goog-Date=20260421T225605Z&X-Goog-Expires=604800&X-Goog-SignedHeaders=host&X-Goog-Signature=9168f0ad4ca2c66957f53f5c8f8084f7557e2337edb536c7ab47d7f0feae01e72426202ee0199150c2afea8b8cc6bbb5e67e7fc51cb73289272dc1dbffaea1cf1c6566ee8a659dd1438806d6927fd2c76b10cef3cc8976630fc750a2ecfe5a0ad84314292d12018000f02f618eaee6e917a308f7854da184c0e136e13d2771189f777897e3407a13183dbecc0756c2fedadfbf3c381e762f652809d897652fb2810be7b6b39aab61abe08b4276c0981ab69e60a9b9769a054267b4733e2c445d13aa9f195f55d6f2489e0402ae0b6f955db7c157641d657d2a079d4f256d04398fe8ab9547710ff41a4166830eb193578edf7ea28e4a2bd23d9085b1ce148f2cstorage.googleapis.com/blockmark-cd... https://storage.googleapis.com/blockmark-cdn/uploaded-user-content/templates/128bc7f8-f6fc-4277-b708-e07c7ca9e768/image_2025-05-29_101823.3940220000_600x600_q85_padding_upscale.png?X-Goog-Algorithm=GOOG4-RSA-SHA256&X-Goog-Credential=application-server-test%40delta-essence-234612.iam.gserviceaccount.com%2F20260421%2Fauto%2Fstorage%2Fgoog4_request&X-Goog-Date=20260421T225605Z&X-Goog-Expires=604800&X-Goog-SignedHeaders=host&X-Goog-Signature=9168f0ad4ca2c66957f53f5c8f8084f7557e2337edb536c7ab47d7f0feae01e72426202ee0199150c2afea8b8cc6bbb5e67e7fc51cb73289272dc1dbffaea1cf1c6566ee8a659dd1438806d6927fd2c76b10cef3cc8976630fc750a2ecfe5a0ad84314292d12018000f02f618eaee6e917a308f7854da184c0e136e13d2771189f777897e3407a13183dbecc0756c2fedadfbf3c381e762f652809d897652fb2810be7b6b39aab61abe08b4276c0981ab69e60a9b9769a054267b4733e2c445d13aa9f195f55d6f2489e0402ae0b6f955db7c157641d657d2a079d4f256d04398fe8ab9547710ff41a4166830eb193578edf7ea28e4a2bd23d9085b1ce148f2c — 200 — 78.1 KiB — 169 ms — h2https://storage.googleapis.com/static-bm-cdn/static/images/BM-White-Tooltip.pngstorage.googleapis.com/static-bm-cd... https://storage.googleapis.com/static-bm-cdn/static/images/BM-White-Tooltip.png — 200 — 2.6 KiB — 78 ms — h2https://a.storyblok.com/f/243782/2119x1414/3445512efe/endometriosis.jpg/m/868x0/filters:quality%2880%29a.storyblok.com/f/243782/2119x1414/... https://a.storyblok.com/f/243782/2119x1414/3445512efe/endometriosis.jpg/m/868x0/filters:quality%2880%29 — 200 — 34.9 KiB — 18 ms — h2https://a.storyblok.com/f/243782/2120x1414/2a90d2a99c/a-senior-male-patient-with-cancer.jpg/m/868x0/filters:quality%2880%29a.storyblok.com/f/243782/2120x1414/... https://a.storyblok.com/f/243782/2120x1414/2a90d2a99c/a-senior-male-patient-with-cancer.jpg/m/868x0/filters:quality%2880%29 — 200 — 42.0 KiB — 20 ms — h2https://a.storyblok.com/f/243782/2121x1414/4962377d67/17042026_pirtobrutinib_fdg_new_story.jpg/m/868x0/filters:quality%2880%29a.storyblok.com/f/243782/2121x1414/... https://a.storyblok.com/f/243782/2121x1414/4962377d67/17042026_pirtobrutinib_fdg_new_story.jpg/m/868x0/filters:quality%2880%29 — 200 — 61.7 KiB — 19 ms — h2https://a.storyblok.com/f/243782/2384x1257/86cd6d83ca/multiple-myeloma.jpg/m/868x0/filters:quality%2880%29a.storyblok.com/f/243782/2384x1257/... https://a.storyblok.com/f/243782/2384x1257/86cd6d83ca/multiple-myeloma.jpg/m/868x0/filters:quality%2880%29 — 200 — 40.3 KiB — 15 ms — h2https://a.storyblok.com/f/243782/2000x1324/463f950299/ammaarah-homepage.jpg/m/899x0/filters:quality%2880%29a.storyblok.com/f/243782/2000x1324/... https://a.storyblok.com/f/243782/2000x1324/463f950299/ammaarah-homepage.jpg/m/899x0/filters:quality%2880%29 — 200 — 56.0 KiB — 14 ms — h2data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 68 48"><path d="M66.52…www.w3.org/2000/svg" viewBox="0 0 6... data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 68 48"><path d="M66.52… — 200 — 0 B — 0 ms — datahttps://i.ytimg.com/vi_webp/lqo8lr4Erok/hqdefault.webpi.ytimg.com/vi_webp/lqo8lr4Erok/hqd... https://i.ytimg.com/vi_webp/lqo8lr4Erok/hqdefault.webp — 200 — 0 B — 3 ms — h2https://a.storyblok.com/f/243782/1800x1200/3c110cfd94/research-3.jpg/m/708x0/filters:format%28avif%29:quality%2880%29a.storyblok.com/f/243782/1800x1200/... https://a.storyblok.com/f/243782/1800x1200/3c110cfd94/research-3.jpg/m/708x0/filters:format%28avif%29:quality%2880%29 — 200 — 42.3 KiB — 5 ms — h2https://a.storyblok.com/f/243782/6016x4016/d19d0fcdc4/biosimilars.jpg/m/708x0/filters:format%28avif%29:quality%2880%29a.storyblok.com/f/243782/6016x4016/... https://a.storyblok.com/f/243782/6016x4016/d19d0fcdc4/biosimilars.jpg/m/708x0/filters:format%28avif%29:quality%2880%29 — 200 — 50.7 KiB — 6 ms — h2https://a.storyblok.com/f/243782/1613x1075/cd0a11bd52/healthtech-event.jpg/m/708x0/filters:format%28avif%29:quality%2880%29a.storyblok.com/f/243782/1613x1075/... 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0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.1 s LCP 2.1 shttps://nice.org.uk// https://nice.org.uk/ — 301 — 85 B — 107 ms — h2https://www.nice.org.uk/www.nice.org.uk/ https://www.nice.org.uk/ — 200 — 35.9 KiB — 161 ms — h2https://cdn.nice.org.uk/cookie-banner/cookie-banner.min.jscdn.nice.org.uk/cookie-banner/cooki... https://cdn.nice.org.uk/cookie-banner/cookie-banner.min.js — 200 — 97.8 KiB — 15 ms — h2https://www.nice.org.uk/_next/static/media/e4af272ccee01ff0-s.p.woff2www.nice.org.uk/_next/static/media/... https://www.nice.org.uk/_next/static/media/e4af272ccee01ff0-s.p.woff2 — 200 — 48.0 KiB — 143 ms — h2https://www.nice.org.uk/_next/static/media/5c0c2bcbaa4149ca-s.p.woff2www.nice.org.uk/_next/static/media/... https://www.nice.org.uk/_next/static/media/5c0c2bcbaa4149ca-s.p.woff2 — 200 — 37.6 KiB — 98 ms — h2https://www.nice.org.uk/_next/static/css/efc4877ac94d4d56.csswww.nice.org.uk/_next/static/css/ef... https://www.nice.org.uk/_next/static/css/efc4877ac94d4d56.css — 200 — 24.1 KiB — 65 ms 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h2https://www.nice.org.uk/favicon.icowww.nice.org.uk/favicon.ico https://www.nice.org.uk/favicon.ico — 200 — 1.5 KiB — 39 ms — h2https://www.nice.org.uk/icons/icon-32x32.pngwww.nice.org.uk/icons/icon-32x32.pn... https://www.nice.org.uk/icons/icon-32x32.png — 200 — 1.3 KiB — 40 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 457ms · 344KB · £7/mo
cdn.nice.org.uk
Other
Optional
Execution 150ms
Transfer 98 KB
Unused 43%
Monthly Cost £2/mo
www.nice.org.uk
Other
Optional
Execution 100ms
Transfer 39 KB
Monthly Cost £1/mo
Unattributable
Other
Optional
Execution 80ms
Transfer 0 KB
Monthly Cost £1/mo
Google Tag Manager
Tag Manager
Optional
Execution 68ms
Transfer 170 KB
Unused 39%
Monthly Cost £1/mo
www.nice.org.uk
Other
Optional
Execution 59ms
Transfer 36 KB
Monthly Cost £1/mo

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

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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