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https://mentalhealth.org.uk

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
77
GRADE
C
FIX
4
REVIEW
2
PASS
9
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.
100
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.
92
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.

3.57 s

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

11.83 s

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

797 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.

4.36 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.

11.99 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
9 PASS 2 REVIEW 4 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
JS Execution Cost
Action
2138ms total JS execution
FIX
2138ms total JS execution
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-KB2...: 389ms CPU time
Warning::
https://www.mentalhealth.org.uk/: 338ms CPU time
Warning::
https://www.googletagmanager.com/gtag/destination?...: 309ms CPU time
Info::
https://cc.cdn.civiccomputing.com/9/cookieControl-...: 236ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-HJ26...: 215ms CPU time
Warning::
Third-party scripts: 2138ms (100% of total)

Main Thread Breakdown

Script Evaluation 59% Other 13% Script Parsing & Compilation 12% Style & Layout 12%
ScriptTotalScriptingParse/CompileParty
https://www.googletagmanager.com/gtm.js?id=GTM-KB2K2D389ms305ms48ms3rd
https://www.mentalhealth.org.uk/338ms10ms1ms3rd
https://www.googletagmanager.com/gtag/destination?id=DC-11797174&cx=c&gtm=4e64k0309ms274ms33ms3rd
https://cc.cdn.civiccomputing.com/9/cookieControl-9.x.min.js236ms193ms43ms3rd
https://www.googletagmanager.com/gtag/js?id=G-HJ268Y8NF0&cx=c&gtm=4e64k0215ms162ms52ms3rd
Unattributable214ms7ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=AW-1018585103&cx=c&gtm=4e64k0155ms115ms39ms3rd
https://www.googletagmanager.com/gtag/js?id=AW-1000813537&cx=c&gtm=4e64k0151ms111ms38ms3rd
https://www.mentalhealth.org.uk/sites/default/files/js/js_awi3CNOFOzZnLrxuwkNkEqCzcmZX9Uc_KVh-cDme0CA.js?scope=footer&delta=0&language=en&theme=mhf_theme&include=eJxdjkEOwyAMBD-Egqo-CDmwIbSAI9uJ0t8X9dTkstLMYXdnmEECzo0VKSylDlSf0SFUXSoaK-suCJ0ObwK4zJwrglH2ecSdJ3rReZXNtXUJiYwqfSCjhuK79PzTtqLBR64V0Qr3P7mC0jinIInrxQs7npddIxm8sD2eTqAbdy0HQkPf_Y2nmdl0LG9fSktfEg131ms96ms10ms3rd
D
JS Bundles
Action
12 scripts, 412 KB unused
FIX
12 scripts, 412 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-HJ26...: 66 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/destination?...: 65 KB unused (50%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-KB2...: 65 KB unused (38%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=AW-101...: 64 KB unused (47%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=AW-100...: 63 KB unused (46%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 412 KB
412 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-HJ268Y8NF0&cx=c&gtm=4e64k0167 KB66 KB (40%)✓3rd
https://www.googletagmanager.com/gtag/destination?id=DC-11797174&cx=c&gtm=4e64k0130 KB65 KB (50%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-KB2K2D172 KB65 KB (38%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-1018585103&cx=c&gtm=4e64k0137 KB64 KB (47%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-1000813537&cx=c&gtm=4e64k0137 KB63 KB (46%)✓3rd
https://cc.cdn.civiccomputing.com/9/cookieControl-9.x.min.js123 KB57 KB (47%)✓3rd
https://www.mentalhealth.org.uk/sites/default/files/js/js_awi3CNOFOzZnLrxuwkNkEqCzcmZX9Uc_KVh-cDme0CA.js?scope=footer&delta=0&language=en&theme=mhf_theme&include=eJxdjkEOwyAMBD-Egqo-CDmwIbSAI9uJ0t8X9dTkstLMYXdnmEECzo0VKSylDlSf0SFUXSoaK-suCJ0ObwK4zJwrglH2ecSdJ3rReZXNtXUJiYwqfSCjhuK79PzTtqLBR64V0Qr3P7mC0jinIInrxQs7npddIxm8sD2eTqAbdy0HQkPf_Y2nmdl0LG9fSktfEg45 KB31 KB (71%)✓3rd
https://www.mentalhealth.org.uk/sites/default/files/js/js_s10-Dh-wa11efHL_o6wFmm_VjKm7NArlvkxT2UpZwjQ.js?scope=header&delta=0&language=en&theme=mhf_theme&include=eJxdjkEOwyAMBD-Egqo-CDmwIbSAI9uJ0t8X9dTkstLMYXdnmEECzo0VKSylDlSf0SFUXSoaK-suCJ0ObwK4zJwrglH2ecSdJ3rReZXNtXUJiYwqfSCjhuK79PzTtqLBR64V0Qr3P7mC0jinIInrxQs7npddIxm8sD2eTqAbdy0HQkPf_Y2nmdl0LG9fSktfEg1 KB—✓3rd
https://www.mentalhealth.org.uk/modules/contrib/google_tag/js/gtag.js?tdwbus1 KB—✓3rd
https://www.mentalhealth.org.uk/modules/contrib/google_tag/js/gtm.js?tdwbus1 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

F
Page Weight Inventory
Action
43 resources · 1.5 MB · 412 KB savings available
FIX
43 resources · 1.5 MB · 412 KB savings available
Warning::
Page weight 514 KB over 1MB target
Got: 1.5 MB Expected: ≤ 1 MB
Info::
~412 KB of savings available
Warning::
42 third-party resources (100% of weight)
43 resources · 1.5 MiB · 42 third-party 514.3 KiB over 1MB target
JavaScript 61% · 935.0 KiB
Image 29% · 453.3 KiB
Font 7% · 102.2 KiB
CSS 2% · 25.2 KiB
Document 1% · 20.4 KiB
Other 0% · 2.2 KiB

~412.4 KiB of savings available

Remove unused JavaScript: 412.4 KiB
B
Page Weight Budget
1.5 MB transferred, 43 requests
REVIEW
1.5 MB transferred, 43 requests
Info::
Page weighs 3.6 MB (1.5 MB transferred)
Warning::
JavaScript is 935 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 935 KB
Info::
43 HTTP requests
Info::
Estimated 0.32 g CO2 per page load
1.5 MB / 2.4 MB budget
1.5 MB transferred
43 requests
0.32 g CO2 per page load
JavaScript 935.0 KiB 61%
Images 449.2 KiB 29%
Fonts 102.2 KiB 7%
CSS 25.2 KiB 2%
HTML 18.9 KiB 1%
Other 5.6 KiB 0%
Other 991 B 0%
Other 660 B 0%
Other 617 B 0%
0 2.4 MB 4.9 MB
Approaching limit

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

B
Image Optimization
11 images, 0 KB saveable
REVIEW
11 images, 0 KB saveable
Warning::
https://www.mentalhealth.org.uk/themes/custom/mhf_... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
11 images 449 KB
0 oversized -0 KB
10 legacy format
1 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

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+
Font Loading
2 fonts (102 KB)
PASS
2 fonts (102 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

102 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 12.0 s FCP 3.6 s LCP 11.8 shttps://use.typekit.net/af/aa897e/00000000000000007735a1c8/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n7&v=3l https://use.typekit.net/af/aa897e/00000000000000007735a1c8/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n7&v=3 — 51.6 KiB — 32 ms — font-display: swaphttps://use.typekit.net/af/a96fc4/00000000000000007735a1de/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3l https://use.typekit.net/af/a96fc4/00000000000000007735a1de/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3 — 50.6 KiB — 8 ms — font-display: swap
l woff2 swap
Size 52 KB
Load time 32 ms
Start 321 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 51 KB
Load time 8 ms
Start 322 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
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
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

A
HTTP Caching
max-age=31536000 (52 weeks)
PASS
max-age=31536000 (52 weeks)
Info::
Cache-Control header is set
Got: max-age=31536000
Info::
Effective TTL: 52 weeks (max-age=31536000)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=31536000

DirectiveValueMeaning
max-age31536000Cache for 52 weeks
Effective TTL: 31536000 seconds
Network Waterfall
43 requests over 1493ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 3.6 s LCP 11.8 shttps://mentalhealth.org.uk// https://mentalhealth.org.uk/ — 301 — 580 B — 75 ms — h2https://www.mentalhealth.org.uk/www.mentalhealth.org.uk/ https://www.mentalhealth.org.uk/ — 200 — 18.9 KiB — 50 ms — h2https://use.typekit.net/vmh0wjw.cssuse.typekit.net/vmh0wjw.css https://use.typekit.net/vmh0wjw.css — 200 — 1.2 KiB — 69 ms — h2https://www.mentalhealth.org.uk/sites/default/files/css/css_41CnlorFoF5rGWviyESGk649W0YNsGOacdW6IDd7DkU.css?delta=0&language=en&theme=mhf_theme&include=eJxdjlFuxCAQQy9EgqoeCA3gBCpg0DBs056-fLTabD_9LD_ZQxXicHUeiO7IZcVhTzQIFRNYYKPMTmWnD7pMzCMUHlPgGj2sCmBqOpwmVNjApSBo5naDZ2G_VE-QIHyLiku3ipjpDtMyb8s3a9u6cH1ZfPJrxf6YI5DCCuvbu-kkdAr1NP7OP8k-W5--5JEQjWB0biM_4CratP_y7pl16NqZb_T0Jb8HvFCLuZ0_OlR8eQwww.mentalhealth.org.uk/sites/defau... https://www.mentalhealth.org.uk/sites/default/files/css/css_41CnlorFoF5rGWviyESGk649W0YNsGOacdW6IDd7DkU.css?delta=0&language=en&theme=mhf_theme&include=eJxdjlFuxCAQQy9EgqoeCA3gBCpg0DBs056-fLTabD_9LD_ZQxXicHUeiO7IZcVhTzQIFRNYYKPMTmWnD7pMzCMUHlPgGj2sCmBqOpwmVNjApSBo5naDZ2G_VE-QIHyLiku3ipjpDtMyb8s3a9u6cH1ZfPJrxf6YI5DCCuvbu-kkdAr1NP7OP8k-W5--5JEQjWB0biM_4CratP_y7pl16NqZb_T0Jb8HvFCLuZ0_OlR8eQ — 200 — 7.5 KiB — 31 ms — h2https://www.mentalhealth.org.uk/sites/default/files/css/css_DGBiLh0b8FCGrxO5GjWhATI1FgzLccqrnS1aQYEFd5k.css?delta=1&language=en&theme=mhf_theme&include=eJxdjlFuxCAQQy9EgqoeCA3gBCpg0DBs056-fLTabD_9LD_ZQxXicHUeiO7IZcVhTzQIFRNYYKPMTmWnD7pMzCMUHlPgGj2sCmBqOpwmVNjApSBo5naDZ2G_VE-QIHyLiku3ipjpDtMyb8s3a9u6cH1ZfPJrxf6YI5DCCuvbu-kkdAr1NP7OP8k-W5--5JEQjWB0biM_4CratP_y7pl16NqZb_T0Jb8HvFCLuZ0_OlR8eQwww.mentalhealth.org.uk/sites/defau... https://www.mentalhealth.org.uk/sites/default/files/css/css_DGBiLh0b8FCGrxO5GjWhATI1FgzLccqrnS1aQYEFd5k.css?delta=1&language=en&theme=mhf_theme&include=eJxdjlFuxCAQQy9EgqoeCA3gBCpg0DBs056-fLTabD_9LD_ZQxXicHUeiO7IZcVhTzQIFRNYYKPMTmWnD7pMzCMUHlPgGj2sCmBqOpwmVNjApSBo5naDZ2G_VE-QIHyLiku3ipjpDtMyb8s3a9u6cH1ZfPJrxf6YI5DCCuvbu-kkdAr1NP7OP8k-W5--5JEQjWB0biM_4CratP_y7pl16NqZb_T0Jb8HvFCLuZ0_OlR8eQ — 200 — 15.6 KiB — 38 ms — h2https://www.mentalhealth.org.uk/sites/default/files/js/js_s10-Dh-wa11efHL_o6wFmm_VjKm7NArlvkxT2UpZwjQ.js?scope=header&delta=0&language=en&theme=mhf_theme&include=eJxdjkEOwyAMBD-Egqo-CDmwIbSAI9uJ0t8X9dTkstLMYXdnmEECzo0VKSylDlSf0SFUXSoaK-suCJ0ObwK4zJwrglH2ecSdJ3rReZXNtXUJiYwqfSCjhuK79PzTtqLBR64V0Qr3P7mC0jinIInrxQs7npddIxm8sD2eTqAbdy0HQkPf_Y2nmdl0LG9fSktfEgwww.mentalhealth.org.uk/sites/defau... https://www.mentalhealth.org.uk/sites/default/files/js/js_s10-Dh-wa11efHL_o6wFmm_VjKm7NArlvkxT2UpZwjQ.js?scope=header&delta=0&language=en&theme=mhf_theme&include=eJxdjkEOwyAMBD-Egqo-CDmwIbSAI9uJ0t8X9dTkstLMYXdnmEECzo0VKSylDlSf0SFUXSoaK-suCJ0ObwK4zJwrglH2ecSdJ3rReZXNtXUJiYwqfSCjhuK79PzTtqLBR64V0Qr3P7mC0jinIInrxQs7npddIxm8sD2eTqAbdy0HQkPf_Y2nmdl0LG9fSktfEg — 200 — 642 B — 34 ms — h2https://www.mentalhealth.org.uk/modules/contrib/google_tag/js/gtag.js?tdwbuswww.mentalhealth.org.uk/modules/con... https://www.mentalhealth.org.uk/modules/contrib/google_tag/js/gtag.js?tdwbus — 200 — 965 B — 31 ms — h2https://www.mentalhealth.org.uk/modules/contrib/google_tag/js/gtm.js?tdwbuswww.mentalhealth.org.uk/modules/con... https://www.mentalhealth.org.uk/modules/contrib/google_tag/js/gtm.js?tdwbus — 200 — 1.0 KiB — 32 ms — h2https://www.mentalhealth.org.uk/themes/custom/mhf_theme/logo.svgwww.mentalhealth.org.uk/themes/cust... https://www.mentalhealth.org.uk/themes/custom/mhf_theme/logo.svg — 200 — 1.9 KiB — 35 ms — h2https://www.mentalhealth.org.uk/sites/default/files/styles/hero_xl/public/2026-01/two%20people%20on%20park%20bench%20smiling.png?h=55e5c65a&itok=Ph1EetVrwww.mentalhealth.org.uk/sites/defau... https://www.mentalhealth.org.uk/sites/default/files/styles/hero_xl/public/2026-01/two%20people%20on%20park%20bench%20smiling.png?h=55e5c65a&itok=Ph1EetVr — 200 — 139.8 KiB — 61 ms — h2https://www.mentalhealth.org.uk/sites/default/files/styles/750_x_450_mhf_theme/public/2026-03/MHAW2026_full_width%20_sideways.png?h=bc77b7f2&itok=jK-s1HaAwww.mentalhealth.org.uk/sites/defau... https://www.mentalhealth.org.uk/sites/default/files/styles/750_x_450_mhf_theme/public/2026-03/MHAW2026_full_width%20_sideways.png?h=bc77b7f2&itok=jK-s1HaA — 200 — 50.8 KiB — 34 ms — 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h3https://ade.googlesyndication.com/ddm/activity/src=11797174;type=vieww0;cat=unive0;rcb=4;ord=9417529017309;u=%2F;npa=1;u1=%2F;gdid=dMDAwNW.dMDhkMT;uaa=;uab=64;uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0;uamb=1;uam=moto%20g%20power%20(2022);uap=Android;uapv=11.0;uaw=0;pscdl=denied;frm=0;_tu=KFA;gtm=45fe64k0v9181784550z872116758za20gzb72116758zd72116758xea;gcs=G100;gcd=13p3pPp2p5l1;dma_cps=-;dma=1;dc_fmt=8;tag_exp=0~115938465~115938468~117266400;epver=2;~oref=https%3A%2F%2Fwww.mentalhealth.org.uk%2F?ade.googlesyndication.com/ddm/activ... https://ade.googlesyndication.com/ddm/activity/src=11797174;type=vieww0;cat=unive0;rcb=4;ord=9417529017309;u=%2F;npa=1;u1=%2F;gdid=dMDAwNW.dMDhkMT;uaa=;uab=64;uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0;uamb=1;uam=moto%20g%20power%20(2022);uap=Android;uapv=11.0;uaw=0;pscdl=denied;frm=0;_tu=KFA;gtm=45fe64k0v9181784550z872116758za20gzb72116758zd72116758xea;gcs=G100;gcd=13p3pPp2p5l1;dma_cps=-;dma=1;dc_fmt=8;tag_exp=0~115938465~115938468~117266400;epver=2;~oref=https%3A%2F%2Fwww.mentalhealth.org.uk%2F? — 200 — 401 B — 160 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 2138ms · 930KB · £22/mo
Google Tag Manager
Tag Manager
Costly
Execution 389ms
Transfer 172 KB
Unused 38%
Monthly Cost £4/mo
www.mentalhealth.org.uk
Other
Costly
Execution 338ms
Transfer 19 KB
Monthly Cost £4/mo
Google Tag Manager
Tag Manager
Costly
Execution 309ms
Transfer 130 KB
Unused 50%
Monthly Cost £3/mo
cc.cdn.civiccomputing.com
Other
Costly
Execution 236ms
Transfer 123 KB
Unused 47%
Monthly Cost £2/mo
Google Tag Manager
Tag Manager
Costly
Execution 215ms
Transfer 167 KB
Unused 40%
Monthly Cost £2/mo
Unattributable
Other
Costly
Execution 214ms
Transfer 0 KB
Monthly Cost £2/mo
Google Tag Manager
Tag Manager
Optional
Execution 155ms
Transfer 137 KB
Unused 47%
Monthly Cost £2/mo
Google Tag Manager
Tag Manager
Optional
Execution 151ms
Transfer 137 KB
Unused 46%
Monthly Cost £2/mo
www.mentalhealth.org.uk
Other
Optional
Execution 131ms
Transfer 45 KB
Unused 71%
Monthly Cost £1/mo

These scripts may cost more than they're worth

  • Google Tag Manager adds 389ms and costs ~£4/month
  • www.mentalhealth.org.uk adds 338ms and costs ~£4/month
  • Google Tag Manager adds 309ms and costs ~£3/month
  • cc.cdn.civiccomputing.com adds 236ms and costs ~£2/month
  • Google Tag Manager adds 215ms and costs ~£2/month
  • Unattributable adds 214ms and costs ~£2/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

Google Tag Manager takes 389ms 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.mentalhealth.org.uk takes 338ms 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 309ms 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

cc.cdn.civiccomputing.com takes 236ms 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 215ms 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 214ms 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

71% of www.mentalhealth.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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