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https://rmg.co.uk

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
73
GRADE
C
FIX
5
REVIEW
3
PASS
7
INFO
2

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

Mobile Desktop
30
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.
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.

3.85 s

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

11.04 s

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

5.54 s

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.

8.21 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.

13.95 s

Page Load Progression

485 ms
969 ms
1.5 s
1.9 s
2.4 s
2.9 s
3.4 s
3.9 s
Checks
17
7 PASS 3 REVIEW 5 FIX
F
Page Weight Budget
Action
3.5 MB transferred, 69 requests
FIX
3.5 MB transferred, 69 requests
Warning::
Page weighs 6.1 MB (3.5 MB transferred)
Warning::
Images are 2.4 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.4 MB
Warning::
JavaScript is 791 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 791 KB
Info::
69 HTTP requests
Info::
Estimated 0.74 g CO2 per page load
3.5 MB / 2.4 MB budget
3.5 MB transferred
69 requests
0.74 g CO2 per page load
Images 2.4 MiB 70%
JavaScript 791.3 KiB 22%
Fonts 158.8 KiB 4%
CSS 109.4 KiB 3%
HTML 29.1 KiB 1%
Other 2.5 KiB 0%
Other 938 B 0%
Other 564 B 0%
Other 21 B 0%
0 2.4 MB 4.9 MB
Over budget

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

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

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 (3.5 MiB of 3.5 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
14684ms total JS execution
FIX
14684ms total JS execution
Warning::
https://consent.cookiebot.com/uc.js: 11101ms CPU time
Warning::
Unattributable: 1562ms CPU time
Warning::
https://www.rmg.co.uk/: 959ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-NKC...: 413ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=DC-151...: 299ms CPU time
Warning::
Third-party scripts: 14684ms (100% of total)

Main Thread Breakdown

Script Evaluation 41% Parse HTML & CSS 39% Other 12% Style & Layout 4%
ScriptTotalScriptingParse/CompileParty
https://consent.cookiebot.com/uc.js11101ms4988ms20ms3rd
Unattributable1562ms214ms0ms3rd
https://www.rmg.co.uk/959ms26ms3ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-NKC7HF413ms344ms66ms3rd
https://www.googletagmanager.com/gtag/js?id=DC-15136481&cx=c&gtm=4e64k1299ms264ms33ms3rd
https://consent.cookiebot.com/80c87521-eb31-4d57-aa08-21bf842d585d/cc.js?renew=false&referer=www.rmg.co.uk&dnt=false&init=false&framework=TCFv2.3207ms52ms154ms3rd
https://consent.cookiebot.com/Framework/IAB/consent-sdk-2.3.js72ms43ms29ms3rd
https://www.rmg.co.uk/sites/default/files/js/js_KSJFmfA5khJb48c2lNsGWhxtW9HTepoWkDWCphJtMTg.js?scope=footer&delta=1&language=en&theme=rmg_theme&include=eJxNyEEKgDAMBMAPWfqkEs22SklSkoDfV2_ehmEgTFt304TyCxLc5rPuFNhcRssTgsqUKOs6Jvy3n7q5xAMWZBxw71ms36ms35ms3rd
D
Page Weight Inventory
Action
69 resources · 3.5 MB · 256 KB savings available
FIX
69 resources · 3.5 MB · 256 KB savings available
Warning::
Page weight 2.5 MB over 1MB target
Got: 3.5 MB Expected: ≤ 1 MB
Info::
~256 KB of savings available
Warning::
68 third-party resources (100% of weight)
Info::
1 resources over 200KB
69 resources · 3.5 MiB · 68 third-party 2.5 MiB over 1MB target
Image 70% · 2.4 MiB
JavaScript 22% · 791.3 KiB
Font 4% · 158.8 KiB
CSS 3% · 109.4 KiB
Document 1% · 29.1 KiB
Other 0% · 1.7 KiB

~255.7 KiB of savings available

Remove unused JavaScript: 255.7 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
Image Optimization
46 images, 0 KB saveable
REVIEW
46 images, 0 KB saveable
Info::
All images are well-optimized
46 images 2.4 MB
0 oversized -0 KB
5 legacy format
0 missing dimensions CLS risk
C
JS Bundles
Action
8 scripts, 256 KB unused
REVIEW
8 scripts, 256 KB unused
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-NKC...: 80 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=DC-151...: 62 KB unused (47%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://consent.cookiebot.com/Framework/IAB/consen...: 48 KB unused (73%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.rmg.co.uk/sites/default/files/js/js_KS...: 40 KB unused (64%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.rmg.co.uk/core/assets/vendor/jquery/jq...: 25 KB unused (79%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 256 KB
256 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtm.js?id=GTM-NKC7HF168 KB80 KB (48%)✓3rd
https://www.googletagmanager.com/gtag/js?id=DC-15136481&cx=c&gtm=4e64k1131 KB62 KB (47%)✓3rd
https://consent.cookiebot.com/Framework/IAB/consent-sdk-2.3.js66 KB48 KB (73%)✓3rd
https://www.rmg.co.uk/sites/default/files/js/js_KSJFmfA5khJb48c2lNsGWhxtW9HTepoWkDWCphJtMTg.js?scope=footer&delta=1&language=en&theme=rmg_theme&include=eJxNyEEKgDAMBMAPWfqkEs22SklSkoDfV2_ehmEgTFt304TyCxLc5rPuFNhcRssTgsqUKOs6Jvy3n7q5xAMWZBxw64 KB40 KB (64%)✓3rd
https://www.rmg.co.uk/core/assets/vendor/jquery/jquery.min.js?v=4.0.032 KB25 KB (79%)✓3rd
https://consent.cookiebot.com/uc.js27 KB—✓3rd
https://consentcdn.cookiebot.com/consentconfig/80c87521-eb31-4d57-aa08-21bf842d585d/rmg.co.uk/configuration.js1 KB—✓3rd
https://consent.cookiebot.com/80c87521-eb31-4d57-aa08-21bf842d585d/cc.js?renew=false&referer=www.rmg.co.uk&dnt=false&init=false&framework=TCFv2.3303 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
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+
Font Loading
3 fonts (159 KB)
PASS
3 fonts (159 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

159 KB total

Render-blocking

0

of 3

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 3.8 s LCP 11.0 shttps://www.rmg.co.uk/themes/custom/rmg_theme/assets/fonts/CeraPro-Regular.woff2CeraPro-Regular.woff2 https://www.rmg.co.uk/themes/custom/rmg_theme/assets/fonts/CeraPro-Regular.woff2 — 53.1 KiB — 22 ms — font-display: swaphttps://www.rmg.co.uk/themes/custom/deeson_frontend_framework/assets/27d6c5f5e35c50d522bafc7b256c4588.woff227d6c5f5e35c50d522bafc7... https://www.rmg.co.uk/themes/custom/deeson_frontend_framework/assets/27d6c5f5e35c50d522bafc7b256c4588.woff2 — 53.1 KiB — 8 ms — font-display: swaphttps://www.rmg.co.uk/themes/custom/deeson_frontend_framework/assets/1c52b06e3d04767b16658f2feaccea89.woff21c52b06e3d04767b16658f2... https://www.rmg.co.uk/themes/custom/deeson_frontend_framework/assets/1c52b06e3d04767b16658f2feaccea89.woff2 — 52.6 KiB — 10 ms — font-display: swap
CeraPro-Regular.woff2 woff2 swap
Size 53 KB
Load time 22 ms
Start 73 ms
Risk FOUT — text flashes from fallback to web font
27d6c5f5e35c50d522bafc7... woff2 swap
Size 53 KB
Load time 8 ms
Start 426 ms
Risk FOUT — text flashes from fallback to web font
1c52b06e3d04767b16658f2... woff2 swap
Size 53 KB
Load time 10 ms
Start 427 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
1 hints, 0 missing preconnects
PASS
1 hints, 0 missing preconnects
Info::
Page uses 1 resource hint(s)

Current Resource Hints

preconnect
—
preload
1
dns-prefetch
—
prefetch
—

1 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
69 requests over 4733ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 3.8 s LCP 11.0 shttps://rmg.co.uk// https://rmg.co.uk/ — 301 — 204 B — 26 ms — h2https://www.rmg.co.uk/www.rmg.co.uk/ https://www.rmg.co.uk/ — 200 — 28.3 KiB — 24 ms — h2https://consent.cookiebot.com/uc.jsconsent.cookiebot.com/uc.js https://consent.cookiebot.com/uc.js — 200 — 27.0 KiB — 146 ms — h2https://www.rmg.co.uk/sites/default/files/css/css_Ru3tQncwdK24e4WTwzkMQ6DxC3BekdKtmZ_kK_mmruk.css?delta=0&language=en&theme=rmg_theme&include=eJxFjFEKgDAMxS4k25FGZ6sOt3b0bYi3V_zxL4QQFoFp2tx0iPIL1OQyP2MmyNJoiBeqqaymiLhbtoqU3Kay8NLJaXfqByL77FTDb8LUPnMtON4QN4a0b_oAdj8t4Qwww.rmg.co.uk/sites/default/files/c... https://www.rmg.co.uk/sites/default/files/css/css_Ru3tQncwdK24e4WTwzkMQ6DxC3BekdKtmZ_kK_mmruk.css?delta=0&language=en&theme=rmg_theme&include=eJxFjFEKgDAMxS4k25FGZ6sOt3b0bYi3V_zxL4QQFoFp2tx0iPIL1OQyP2MmyNJoiBeqqaymiLhbtoqU3Kay8NLJaXfqByL77FTDb8LUPnMtON4QN4a0b_oAdj8t4Q — 200 — 670 B — 20 ms — h2https://fonts.googleapis.com/css2?family=Material+Symbols+Rounded:opsz,wght,FILL,GRAD@20..48,100..700,0..1,-50..200fonts.googleapis.com/css2?family=Ma... https://fonts.googleapis.com/css2?family=Material+Symbols+Rounded:opsz,wght,FILL,GRAD@20..48,100..700,0..1,-50..200 — 200 — 849 B — 86 ms — h2https://www.rmg.co.uk/sites/default/files/css/css_68OtwsA9yXByteFcz9bQ9VEl7mgiL2212AFfTt7YYfE.css?delta=2&language=en&theme=rmg_theme&include=eJxFjFEKgDAMxS4k25FGZ6sOt3b0bYi3V_zxL4QQFoFp2tx0iPIL1OQyP2MmyNJoiBeqqaymiLhbtoqU3Kay8NLJaXfqByL77FTDb8LUPnMtON4QN4a0b_oAdj8t4Qwww.rmg.co.uk/sites/default/files/c... https://www.rmg.co.uk/sites/default/files/css/css_68OtwsA9yXByteFcz9bQ9VEl7mgiL2212AFfTt7YYfE.css?delta=2&language=en&theme=rmg_theme&include=eJxFjFEKgDAMxS4k25FGZ6sOt3b0bYi3V_zxL4QQFoFp2tx0iPIL1OQyP2MmyNJoiBeqqaymiLhbtoqU3Kay8NLJaXfqByL77FTDb8LUPnMtON4QN4a0b_oAdj8t4Q — 200 — 346 B — 19 ms — h2https://www.rmg.co.uk/sites/default/files/css/css_fkhXEVvCa1xf8l5IPSzjaNSrST4cU3gKlFZ8bZsRVXY.css?delta=3&language=en&theme=rmg_theme&include=eJxFjFEKgDAMxS4k25FGZ6sOt3b0bYi3V_zxL4QQFoFp2tx0iPIL1OQyP2MmyNJoiBeqqaymiLhbtoqU3Kay8NLJaXfqByL77FTDb8LUPnMtON4QN4a0b_oAdj8t4Qwww.rmg.co.uk/sites/default/files/c... https://www.rmg.co.uk/sites/default/files/css/css_fkhXEVvCa1xf8l5IPSzjaNSrST4cU3gKlFZ8bZsRVXY.css?delta=3&language=en&theme=rmg_theme&include=eJxFjFEKgDAMxS4k25FGZ6sOt3b0bYi3V_zxL4QQFoFp2tx0iPIL1OQyP2MmyNJoiBeqqaymiLhbtoqU3Kay8NLJaXfqByL77FTDb8LUPnMtON4QN4a0b_oAdj8t4Q — 200 — 107.6 KiB — 31 ms — h2https://www.rmg.co.uk/themes/custom/rmg_theme/assets/fonts/CeraPro-Regular.woff2www.rmg.co.uk/themes/custom/rmg_the... https://www.rmg.co.uk/themes/custom/rmg_theme/assets/fonts/CeraPro-Regular.woff2 — 200 — 53.1 KiB — 22 ms — h2https://www.rmg.co.uk/sites/default/files/styles/full_width_1440_mobile/public/2023-07/Visit%20Greenwich%202023%20Domestic%20Tourist%20campaign%20-%20square%20test.jpg.webp?itok=em9dmRZIwww.rmg.co.uk/sites/default/files/s... https://www.rmg.co.uk/sites/default/files/styles/full_width_1440_mobile/public/2023-07/Visit%20Greenwich%202023%20Domestic%20Tourist%20campaign%20-%20square%20test.jpg.webp?itok=em9dmRZI — 200 — 183.6 KiB — 31 ms — h2https://www.rmg.co.uk/core/assets/vendor/jquery/jquery.min.js?v=4.0.0www.rmg.co.uk/core/assets/vendor/jq... https://www.rmg.co.uk/core/assets/vendor/jquery/jquery.min.js?v=4.0.0 — 200 — 31.7 KiB — 19 ms — h2https://www.rmg.co.uk/sites/default/files/js/js_KSJFmfA5khJb48c2lNsGWhxtW9HTepoWkDWCphJtMTg.js?scope=footer&delta=1&language=en&theme=rmg_theme&include=eJxNyEEKgDAMBMAPWfqkEs22SklSkoDfV2_ehmEgTFt304TyCxLc5rPuFNhcRssTgsqUKOs6Jvy3n7q5xAMWZBxwwww.rmg.co.uk/sites/default/files/j... https://www.rmg.co.uk/sites/default/files/js/js_KSJFmfA5khJb48c2lNsGWhxtW9HTepoWkDWCphJtMTg.js?scope=footer&delta=1&language=en&theme=rmg_theme&include=eJxNyEEKgDAMBMAPWfqkEs22SklSkoDfV2_ehmEgTFt304TyCxLc5rPuFNhcRssTgsqUKOs6Jvy3n7q5xAMWZBxw — 200 — 63.6 KiB — 14 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-NKC7HFwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-NKC7HF — 200 — 167.7 KiB — 104 ms — h2https://consentcdn.cookiebot.com/consentconfig/80c87521-eb31-4d57-aa08-21bf842d585d/rmg.co.uk/configuration.jsconsentcdn.cookiebot.com/consentcon... https://consentcdn.cookiebot.com/consentconfig/80c87521-eb31-4d57-aa08-21bf842d585d/rmg.co.uk/configuration.js — 200 — 1.4 KiB — 27 ms — h2https://consentcdn.cookiebot.com/consentconfig/80c87521-eb31-4d57-aa08-21bf842d585d/settings.jsonconsentcdn.cookiebot.com/consentcon... https://consentcdn.cookiebot.com/consentconfig/80c87521-eb31-4d57-aa08-21bf842d585d/settings.json — 200 — 938 B — 31 ms — h2https://consent.cookiebot.com/Framework/IAB/consent-sdk-2.3.jsconsent.cookiebot.com/Framework/IAB... https://consent.cookiebot.com/Framework/IAB/consent-sdk-2.3.js — 200 — 66.4 KiB — 45 ms — h2https://consent.cookiebot.com/80c87521-eb31-4d57-aa08-21bf842d585d/cc.js?renew=false&referer=www.rmg.co.uk&dnt=false&init=false&framework=TCFv2.3consent.cookiebot.com/80c87521-eb31... https://consent.cookiebot.com/80c87521-eb31-4d57-aa08-21bf842d585d/cc.js?renew=false&referer=www.rmg.co.uk&dnt=false&init=false&framework=TCFv2.3 — 200 — 302.7 KiB — 328 ms — h2data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIzNSIgaGVpZ…data:image/svg+xml;base64,PHN2ZyB4b... data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIzNSIgaGVpZ… — 200 — 0 B — 0 ms — datadata:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIyNiIgaGVpZ…data:image/svg+xml;base64,PHN2ZyB4b... 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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 14684ms · 786KB · £152/mo
consent.cookiebot.com
Other
Costly
Execution 11101ms
Transfer 27 KB
Monthly Cost £115/mo
Unattributable
Other
Costly
Execution 1562ms
Transfer 0 KB
Monthly Cost £16/mo
www.rmg.co.uk
Other
Costly
Execution 959ms
Transfer 28 KB
Monthly Cost £10/mo
Google Tag Manager
Tag Manager
Costly
Execution 413ms
Transfer 168 KB
Unused 48%
Monthly Cost £4/mo
Google Tag Manager
Tag Manager
Costly
Execution 299ms
Transfer 131 KB
Unused 47%
Monthly Cost £3/mo
consent.cookiebot.com
Other
Costly
Execution 207ms
Transfer 303 KB
Monthly Cost £2/mo
consent.cookiebot.com
Other
Optional
Execution 72ms
Transfer 66 KB
Unused 73%
Monthly Cost £1/mo
www.rmg.co.uk
Other
Optional
Execution 71ms
Transfer 64 KB
Unused 64%
Monthly Cost £1/mo

These scripts may cost more than they're worth

  • consent.cookiebot.com adds 11101ms and costs ~£115/month
  • Unattributable adds 1562ms and costs ~£16/month
  • www.rmg.co.uk adds 959ms and costs ~£10/month
  • Google Tag Manager adds 413ms and costs ~£4/month
  • Google Tag Manager adds 299ms and costs ~£3/month
  • consent.cookiebot.com adds 207ms 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

consent.cookiebot.com takes 11101ms 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 1562ms 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.rmg.co.uk takes 959ms 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 413ms 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 299ms 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

consent.cookiebot.com takes 207ms 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

73% of consent.cookiebot.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

64% of www.rmg.co.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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