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https://nice.org.uk

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
85
GRADE
B
FIX
2
REVIEW
5
PASS
8
INFO
2

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

Mobile Desktop
47
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
93
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.

4.21 s

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

11.43 s

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

544 ms

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

0.000

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

6.59 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.

11.50 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
17
8 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 (1.1 MiB of 1.1 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
1.1 MB transferred, 34 requests
REVIEW
1.1 MB transferred, 34 requests
Info::
Page weighs 2.9 MB (1.1 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::
34 HTTP requests
Info::
Estimated 0.24 g CO2 per page load
1.1 MB / 2.4 MB budget
1.1 MB transferred
34 requests
0.24 g CO2 per page load
JavaScript 701.8 KiB 60%
Images 315.6 KiB 27%
Fonts 85.5 KiB 7%
HTML 37.6 KiB 3%
CSS 25.0 KiB 2%
Other 10.8 KiB 1%
Other 611 B 0%
Other 549 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 Execution Cost
Action
1621ms total JS execution
REVIEW
1621ms total JS execution
Warning::
https://cdn.nice.org.uk/cookie-banner/cookie-banne...: 426ms CPU time
Warning::
https://www.nice.org.uk/_next/static/chunks/main-4...: 322ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-Z92E...: 247ms CPU time
Info::
Unattributable: 209ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-M55...: 167ms CPU time
Warning::
Third-party scripts: 1621ms (100% of total)

Main Thread Breakdown

Script Evaluation 64% Other 14% Script Parsing & Compilation 11% Style & Layout 7%
ScriptTotalScriptingParse/CompileParty
https://cdn.nice.org.uk/cookie-banner/cookie-banner.min.js426ms354ms27ms3rd
https://www.nice.org.uk/_next/static/chunks/main-433b6987f8bc2715.js322ms303ms10ms3rd
https://www.googletagmanager.com/gtag/js?id=G-Z92EPYYZ1S&cx=c&gtm=4e64h1247ms206ms40ms3rd
Unattributable209ms5ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-M55QTQ167ms109ms55ms3rd
https://www.nice.org.uk/135ms4ms0ms3rd
https://www.nice.org.uk/_next/static/chunks/pages/_app-3bb779198370a52c.js115ms61ms40ms3rd
C
JS Bundles
Action
13 scripts, 254 KB unused
REVIEW
13 scripts, 254 KB unused
Warning::
https://www.nice.org.uk/_next/static/chunks/pages/...: 77 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: 254 KB
254 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.nice.org.uk/_next/static/chunks/pages/_app-3bb779198370a52c.js138 KB77 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=4e64h1171 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?87179835271 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

B
Page Weight Inventory
34 resources · 1.1 MB · 254 KB savings available
REVIEW
34 resources · 1.1 MB · 254 KB savings available
Warning::
Page weight 154 KB over 1MB target
Got: 1.1 MB Expected: ≤ 1 MB
Info::
~254 KB of savings available
Warning::
33 third-party resources (100% of weight)
34 resources · 1.1 MiB · 33 third-party 153.6 KiB over 1MB target
JavaScript 60% · 701.8 KiB
Image 28% · 326.4 KiB
Font 7% · 85.5 KiB
Document 3% · 37.7 KiB
CSS 2% · 25.0 KiB
Other 0% · 1.1 KiB

~254.4 KiB of savings available

Remove unused JavaScript: 254.4 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
9 images, 0 KB saveable
PASS
9 images, 0 KB saveable
Info::
All images are well-optimized
9 images 316 KB
0 oversized -0 KB
2 legacy format
0 missing dimensions CLS risk
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 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 4.2 s LCP 11.4 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 — 111 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 — 111 ms — font-display: swap
e4af272ccee01ff0-s.p.woff2 woff2 swap
Size 48 KB
Load time 111 ms
Start 281 ms
Risk FOUT — text flashes from fallback to web font
5c0c2bcbaa4149ca-s.p.woff2 woff2 swap
Size 38 KB
Load time 111 ms
Start 281 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
4 hints, 0 missing preconnects
PASS
4 hints, 0 missing preconnects
Info::
Page uses 4 resource hint(s)

Current Resource Hints

preconnect
—
preload
3
dns-prefetch
—
prefetch
1

4 resource hints configured

A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
Network Waterfall
34 requests over 1002ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 4.2 s LCP 11.4 shttps://nice.org.uk// https://nice.org.uk/ — 301 — 85 B — 113 ms — h2https://www.nice.org.uk/www.nice.org.uk/ https://www.nice.org.uk/ — 200 — 35.9 KiB — 155 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 — 44 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 — 111 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 — 111 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 — 41 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 — 42 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 — 111 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 — 77 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 — 117 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 — 72 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 — 110 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 — 881 B — 107 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 — 96 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 — 129 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 — 611 B — 99 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 — 947 B — 93 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=20260421T225544Z&X-Goog-Expires=604800&X-Goog-SignedHeaders=host&X-Goog-Signature=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.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=20260421T225544Z&X-Goog-Expires=604800&X-Goog-SignedHeaders=host&X-Goog-Signature=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 — 200 — 78.1 KiB — 196 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 — 2.7 KiB — 93 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 — 39 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 — 40 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 — 44 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 — 45 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 — 41 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 — 0 B — 1 ms — h2data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 68 48"><path 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0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 4.2 s LCP 11.4 shttps://nice.org.uk// https://nice.org.uk/ — 301 — 85 B — 113 ms — h2https://www.nice.org.uk/www.nice.org.uk/ https://www.nice.org.uk/ — 200 — 35.9 KiB — 155 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 — 44 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 — 111 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 — 111 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 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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 1621ms · 670KB · £24/mo
cdn.nice.org.uk
Other
Costly
Execution 426ms
Transfer 98 KB
Unused 43%
Monthly Cost £6/mo
www.nice.org.uk
Other
Costly
Execution 322ms
Transfer 39 KB
Monthly Cost £5/mo
Google Tag Manager
Tag Manager
Costly
Execution 247ms
Transfer 171 KB
Unused 39%
Monthly Cost £4/mo
Unattributable
Other
Costly
Execution 209ms
Transfer 0 KB
Monthly Cost £3/mo
Google Tag Manager
Tag Manager
Optional
Execution 167ms
Transfer 188 KB
Unused 37%
Monthly Cost £2/mo
www.nice.org.uk
Other
Optional
Execution 135ms
Transfer 36 KB
Monthly Cost £2/mo
www.nice.org.uk
Other
Optional
Execution 115ms
Transfer 138 KB
Unused 56%
Monthly Cost £2/mo

These scripts may cost more than they're worth

  • cdn.nice.org.uk adds 426ms and costs ~£6/month
  • www.nice.org.uk adds 322ms and costs ~£5/month
  • Google Tag Manager adds 247ms and costs ~£4/month
  • Unattributable adds 209ms and costs ~£3/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

cdn.nice.org.uk takes 426ms 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

www.nice.org.uk takes 322ms 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

Google Tag Manager takes 247ms 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

Unattributable takes 209ms 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

56% of www.nice.org.uk'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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