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https://mentalhealth.org.uk

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
77
GRADE
C
FIX
3
REVIEW
2
PASS
8
INFO
2

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

Mobile Desktop
91
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.

1.06 s

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

1.72 s

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

8 ms

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

0.001

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

1.23 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.

2.69 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
8 PASS 2 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 (1.7 MiB of 1.7 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Bundles
Action
12 scripts, 411 KB unused
FIX
12 scripts, 411 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-HJ26...: 65 KB unused (39%)
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: 411 KB
411 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-HJ268Y8NF0&cx=c&gtm=4e64k0167 KB65 KB (39%)✓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
54 resources · 1.7 MB · 411 KB savings available
FIX
54 resources · 1.7 MB · 411 KB savings available
Warning::
Page weight 731 KB over 1MB target
Got: 1.7 MB Expected: ≤ 1 MB
Info::
~411 KB of savings available
Warning::
53 third-party resources (100% of weight)
54 resources · 1.7 MiB · 53 third-party 731.5 KiB over 1MB target
JavaScript 53% · 935.6 KiB
Image 38% · 668.5 KiB
Font 6% · 102.2 KiB
CSS 1% · 25.6 KiB
Document 1% · 21.3 KiB
Other 0% · 2.2 KiB

~411.2 KiB of savings available

Remove unused JavaScript: 411.2 KiB
C
Page Weight Budget
Action
1.7 MB transferred, 54 requests
REVIEW
1.7 MB transferred, 54 requests
Info::
Page weighs 3.8 MB (1.7 MB transferred)
Warning::
JavaScript is 936 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 936 KB
Info::
54 HTTP requests
Info::
Estimated 0.36 g CO2 per page load
1.7 MB / 2.4 MB budget
1.7 MB transferred
54 requests
0.36 g CO2 per page load
JavaScript 935.6 KiB 53%
Images 664.3 KiB 38%
Fonts 102.2 KiB 6%
CSS 25.6 KiB 1%
HTML 19.1 KiB 1%
Other 6.4 KiB 0%
Other 993 B 0%
Other 660 B 0%
Other 620 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
21 images, 0 KB saveable
REVIEW
21 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.
21 images 664 KB
0 oversized -0 KB
19 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+
JS Execution Cost
426ms total JS execution
PASS
426ms total JS execution
Info::
https://www.mentalhealth.org.uk/: 117ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-KB2...: 93ms CPU time
Info::
https://www.googletagmanager.com/gtag/destination?...: 84ms CPU time
Info::
Unattributable: 73ms CPU time
Info::
https://cc.cdn.civiccomputing.com/9/cookieControl-...: 58ms CPU time
Warning::
Third-party scripts: 426ms (100% of total)

Main Thread Breakdown

Script Evaluation 53% Other 16% Style & Layout 16% Script Parsing & Compilation 10%
ScriptTotalScriptingParse/CompileParty
https://www.mentalhealth.org.uk/117ms3ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-KB2K2D93ms73ms12ms3rd
https://www.googletagmanager.com/gtag/destination?id=DC-11797174&cx=c&gtm=4e64k084ms76ms7ms3rd
Unattributable73ms2ms0ms3rd
https://cc.cdn.civiccomputing.com/9/cookieControl-9.x.min.js58ms48ms10ms3rd
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 500 ms 1.0 s 1.5 s FCP 1.1 s LCP 1.7 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 — 27 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 — 18 ms — font-display: swap
l woff2 swap
Size 52 KB
Load time 27 ms
Start 302 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 51 KB
Load time 18 ms
Start 303 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+
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
54 requests over 1615ms
INFO
0 ms 500 ms 1.0 s 1.5 s FCP 1.1 s LCP 1.7 shttps://mentalhealth.org.uk// https://mentalhealth.org.uk/ — 301 — 627 B — 89 ms — h3https://www.mentalhealth.org.uk/www.mentalhealth.org.uk/ https://www.mentalhealth.org.uk/ — 200 — 19.1 KiB — 92 ms — h3https://use.typekit.net/vmh0wjw.cssuse.typekit.net/vmh0wjw.css https://use.typekit.net/vmh0wjw.css — 200 — 1.2 KiB — 12 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 — 7.7 KiB — 34 ms — h3https://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 — 15.8 KiB — 41 ms — h3https://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 — 866 B — 33 ms — h3https://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 — 1.2 KiB — 34 ms — h3https://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 — 1.2 KiB — 32 ms — h3https://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 — 2.1 KiB — 33 ms — h3https://www.mentalhealth.org.uk/sites/default/files/styles/hero_xxl/public/2026-01/two%20people%20on%20park%20bench%20smiling.png?h=55e5c65a&itok=80v01y4vwww.mentalhealth.org.uk/sites/defau... https://www.mentalhealth.org.uk/sites/default/files/styles/hero_xxl/public/2026-01/two%20people%20on%20park%20bench%20smiling.png?h=55e5c65a&itok=80v01y4v — 200 — 95.5 KiB — 75 ms — h3https://p.typekit.net/p.css?s=1&k=vmh0wjw&ht=tk&f=17007.17008.17013.17016.31633.31634.31744.31745.31748.31749&a=189283341&app=typekit&e=cssp.typekit.net/p.css?s=1&k=vmh0wjw&h... https://p.typekit.net/p.css?s=1&k=vmh0wjw&ht=tk&f=17007.17008.17013.17016.31633.31634.31744.31745.31748.31749&a=189283341&app=typekit&e=css — 200 — 172 B — 6 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 — 50.7 KiB — 43 ms — h3https://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_Y2nmdl0LG9fSktfEgwww.mentalhealth.org.uk/sites/defau... 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_Y2nmdl0LG9fSktfEg — 200 — 45.1 KiB — 36 ms — 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h3https://ade.googlesyndication.com/ddm/activity/src=11797174;type=vieww0;cat=unive0;rcb=5;ord=5597118098991;u=%2F;npa=1;u1=%2F;gdid=dMDAwNW.dMDhkMT;uaa=x86;uab=64;uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0;uamb=0;uam=;uap=macOS;uapv=10.15.7;uaw=0;pscdl=denied;frm=0;_tu=KFA;gtm=45fe64k0v9181784550z872116758za20gzb72116758zd72116758xea;gcs=G100;gcd=13p3pPp2p5l1;dma_cps=-;dma=1;dc_fmt=8;tag_exp=0~115938465~115938468~117266401~118463261;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=5;ord=5597118098991;u=%2F;npa=1;u1=%2F;gdid=dMDAwNW.dMDhkMT;uaa=x86;uab=64;uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0;uamb=0;uam=;uap=macOS;uapv=10.15.7;uaw=0;pscdl=denied;frm=0;_tu=KFA;gtm=45fe64k0v9181784550z872116758za20gzb72116758zd72116758xea;gcs=G100;gcd=13p3pPp2p5l1;dma_cps=-;dma=1;dc_fmt=8;tag_exp=0~115938465~115938468~117266401~118463261;epver=2;~oref=https%3A%2F%2Fwww.mentalhealth.org.uk%2F? — 302 — 793 B — 259 ms — h2https://ade.googlesyndication.com/ddm/activity/src=11797174;dc_pre=CN283c-pgpQDFdH4OwIdj1g9xQ;type=vieww0;cat=unive0;rcb=5;ord=5597118098991;u=%2F;npa=1;u1=%2F;gdid=dMDAwNW.dMDhkMT;uaa=x86;uab=64;uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0;uamb=0;uam=;uap=macOS;uapv=10.15.7;uaw=0;pscdl=denied;frm=0;_tu=KFA;gtm=45fe64k0v9181784550z872116758za20gzb72116758zd72116758xea;gcs=G100;gcd=13p3pPp2p5l1;dma_cps=-;dma=1;dc_fmt=8;tag_exp=0~115938465~115938468~117266401~118463261;epver=2;~oref=https%3A%2F%2Fwww.mentalhealth.org.uk%2F?ade.googlesyndication.com/ddm/activ... https://ade.googlesyndication.com/ddm/activity/src=11797174;dc_pre=CN283c-pgpQDFdH4OwIdj1g9xQ;type=vieww0;cat=unive0;rcb=5;ord=5597118098991;u=%2F;npa=1;u1=%2F;gdid=dMDAwNW.dMDhkMT;uaa=x86;uab=64;uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0;uamb=0;uam=;uap=macOS;uapv=10.15.7;uaw=0;pscdl=denied;frm=0;_tu=KFA;gtm=45fe64k0v9181784550z872116758za20gzb72116758zd72116758xea;gcs=G100;gcd=13p3pPp2p5l1;dma_cps=-;dma=1;dc_fmt=8;tag_exp=0~115938465~115938468~117266401~118463261;epver=2;~oref=https%3A%2F%2Fwww.mentalhealth.org.uk%2F? — 200 — 118 B — 61 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 426ms · 444KB · £4/mo
www.mentalhealth.org.uk
Other
Optional
Execution 117ms
Transfer 19 KB
Monthly Cost £1/mo
Google Tag Manager
Tag Manager
Optional
Execution 93ms
Transfer 172 KB
Unused 38%
Monthly Cost £1/mo
Google Tag Manager
Tag Manager
Optional
Execution 84ms
Transfer 130 KB
Unused 50%
Monthly Cost £1/mo
Unattributable
Other
Optional
Execution 73ms
Transfer 0 KB
Monthly Cost £1/mo
cc.cdn.civiccomputing.com
Other
Optional
Execution 58ms
Transfer 123 KB
Unused 47%
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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