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https://fca.org.uk

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
86
GRADE
B
FIX
2
REVIEW
2
PASS
9
INFO
2

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

Mobile Desktop
98
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.

681 ms

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

1.13 s

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

0 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.

681 ms

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

1.13 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
9 PASS 2 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 (702.2 KiB of 702.3 KiB)
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
Image Optimization
22 images, 0 KB saveable
REVIEW
22 images, 0 KB saveable
Info::
All images are well-optimized
22 images 206 KB
0 oversized -0 KB
11 legacy format
0 missing dimensions CLS risk
C
JS Bundles
Action
8 scripts, 163 KB unused
REVIEW
8 scripts, 163 KB unused
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-PCC...: 77 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://code.jquery.com/ui/1.14.1/jquery-ui.min.js: 57 KB unused (87%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.fca.org.uk/sites/default/files/js/js_y...: 29 KB unused (52%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 163 KB
163 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtm.js?id=GTM-PCC62S185 KB77 KB (42%)✓3rd
https://code.jquery.com/ui/1.14.1/jquery-ui.min.js66 KB57 KB (87%)✓3rd
https://www.fca.org.uk/sites/default/files/js/js_ypVWssV0CM9DT4gWNPVSnIXB4K8TBFA8waH89FSsj7s.js?scope=footer&delta=0&language=en&theme=fca&include=eJyVkFFuwzAIhi_k1EdCmJLEimMsjLPt9nO9pdOk9KEPCPj4QUAQsWqKxYczgqIMMUdzT-SLFDlYHTcgkS1yd3tJETOxv4KOPy3FvPm7toLp9pu6mdB3g7nlzCkgbVAZlVaYRfdRXpIETFO1r96xDBRJcgWVDyBUaZXTA1-scknf0cJi-wt9zAdXqzuqnVUk4mLu_0H-L5ywmYwRbD9r9Ee28c5WpoBdp65fw2RRMtQVldU_wTTA_RsCCKZC56 KB29 KB (52%)✓3rd
https://www.fca.org.uk/sites/default/files/google_tag/fca_gtm_container/google_tag.script.js?tdu7l00 KB—✓3rd
https://www.fca.org.uk/sites/default/files/js/js_BksLUxT79TWZC538bs4bLSJ6R3Ytdy1WDz7oUXCwSoM.js?scope=footer&delta=2&language=en&theme=fca&include=eJyVkFFuwzAIhi_k1EdCmJLEimMsjLPt9nO9pdOk9KEPCPj4QUAQsWqKxYczgqIMMUdzT-SLFDlYHTcgkS1yd3tJETOxv4KOPy3FvPm7toLp9pu6mdB3g7nlzCkgbVAZlVaYRfdRXpIETFO1r96xDBRJcgWVDyBUaZXTA1-scknf0cJi-wt9zAdXqzuqnVUk4mLu_0H-L5ywmYwRbD9r9Ee28c5WpoBdp65fw2RRMtQVldU_wTTA_RsCCKZC22 KB—✓3rd
https://www.fca.org.uk/sites/default/files/js/js_O4I22dHUn0OLydtg9PNAbWV2CB50n_u4UM70l6ftlss.js?scope=footer&delta=4&language=en&theme=fca&include=eJyVkFFuwzAIhi_k1EdCmJLEimMsjLPt9nO9pdOk9KEPCPj4QUAQsWqKxYczgqIMMUdzT-SLFDlYHTcgkS1yd3tJETOxv4KOPy3FvPm7toLp9pu6mdB3g7nlzCkgbVAZlVaYRfdRXpIETFO1r96xDBRJcgWVDyBUaZXTA1-scknf0cJi-wt9zAdXqzuqnVUk4mLu_0H-L5ywmYwRbD9r9Ee28c5WpoBdp65fw2RRMtQVldU_wTTA_RsCCKZC10 KB—✓3rd
https://www.fca.org.uk/themes/custom/fca/assets/js/fca-cookie-patch.min.js?tdu7l00 KB—✓3rd
https://js-agent.newrelic.com/nr-spa-1.313.1.min.js30 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

A+
Page Weight Budget
702 KB transferred, 40 requests
PASS
702 KB transferred, 40 requests
Info::
Page weighs 2.0 MB (702 KB transferred)
Info::
40 HTTP requests
Info::
Estimated 0.14 g CO2 per page load
702 KB / 2.4 MB budget
702 KB transferred
40 requests
0.14 g CO2 per page load
JavaScript 368.9 KiB 53%
Images 206.1 KiB 29%
CSS 61.0 KiB 9%
HTML 45.7 KiB 7%
Fonts 17.8 KiB 3%
Other 1.9 KiB 0%
Other 958 B 0%
0 2.4 MB 4.9 MB
Under budget
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
199ms total JS execution
PASS
199ms total JS execution
Info::
https://www.fca.org.uk/: 120ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-PCC...: 79ms CPU time
Warning::
Third-party scripts: 199ms (100% of total)

Main Thread Breakdown

Script Evaluation 52% Other 18% Style & Layout 13% Script Parsing & Compilation 8% Parse HTML & CSS 5%
ScriptTotalScriptingParse/CompileParty
https://www.fca.org.uk/120ms65ms5ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-PCC62S79ms61ms13ms3rd
A+
Font Loading
1 fonts (18 KB)
PASS
1 fonts (18 KB)
Info::
1 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

1

18 KB total

Render-blocking

0

of 1

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s FCP 681 ms LCP 1.1 shttps://www.fca.org.uk/themes/custom/fca/bootstrap/fonts/bootstrap/glyphicons-halflings-regular.woff2glyphicons-halflings-re... https://www.fca.org.uk/themes/custom/fca/bootstrap/fonts/bootstrap/glyphicons-halflings-regular.woff2 — 17.8 KiB — 29 ms — font-display: swap
glyphicons-halflings-re... woff2 swap
Size 18 KB
Load time 29 ms
Start 143 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
Page Weight Inventory
40 resources · 702 KB · 163 KB savings available
PASS
40 resources · 702 KB · 163 KB savings available
Info::
Within 1MB page-weight target
Got: 702 KB
Info::
~163 KB of savings available
Warning::
39 third-party resources (100% of weight)
40 resources · 702.3 KiB · 39 third-party Within 1MB page-weight target
JavaScript 53% · 368.9 KiB
Image 30% · 208.2 KiB
CSS 9% · 61.0 KiB
Document 7% · 45.7 KiB
Font 3% · 17.8 KiB
Other 0% · 771 B

~163.4 KiB of savings available

Remove unused JavaScript: 163.4 KiB
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

Network Waterfall
40 requests over 860ms
INFO
0 ms 500 ms 1.0 s FCP 681 ms LCP 1.1 shttps://fca.org.uk// https://fca.org.uk/ — 301 — 95 B — 58 ms — h2https://www.fca.org.uk/www.fca.org.uk/ https://www.fca.org.uk/ — 200 — 45.7 KiB — 77 ms — h2https://www.fca.org.uk/sites/default/files/google_tag/fca_gtm_container/google_tag.script.js?tdu7l0www.fca.org.uk/sites/default/files/... https://www.fca.org.uk/sites/default/files/google_tag/fca_gtm_container/google_tag.script.js?tdu7l0 — 200 — 382 B — 77 ms — h2https://www.fca.org.uk/sites/default/files/css/css_OyJr_9pykYGyotbnlN19q-6etuOTeSS_Xdehepn8uKE.css?delta=0&language=en&theme=fca&include=eJxtkE1ywzAIhS-kxIv2PhokY5sJAg1ISXP7ynaSbrrQ3_fQmwfYY1a9EY6jVCaQjBP-A-OMC3RuAX8ak9ym2XoFvr6eYckwfY167kViYs0n-v4ZTBpKO6EfdKy4dBHkBPkWHcHyFhe1cspkxfd_3gtadFqlqjeS9ZBX1gR88fbkN9rQNCYYjhapwIoHpd0imj5iBtPuyAdmaOgtCj58F-Yzk6PdafR5upxIMwGHCgarQd383fQfuXapPTH5hnOoyvwpGffLPhkP1UgaJB6DlUbt-cIjDuZGKtE3MLTpAy4HmIM_vWGZEjiGO42407Ffi86d8RcgG6z2www.fca.org.uk/sites/default/files/... https://www.fca.org.uk/sites/default/files/css/css_OyJr_9pykYGyotbnlN19q-6etuOTeSS_Xdehepn8uKE.css?delta=0&language=en&theme=fca&include=eJxtkE1ywzAIhS-kxIv2PhokY5sJAg1ISXP7ynaSbrrQ3_fQmwfYY1a9EY6jVCaQjBP-A-OMC3RuAX8ak9ym2XoFvr6eYckwfY167kViYs0n-v4ZTBpKO6EfdKy4dBHkBPkWHcHyFhe1cspkxfd_3gtadFqlqjeS9ZBX1gR88fbkN9rQNCYYjhapwIoHpd0imj5iBtPuyAdmaOgtCj58F-Yzk6PdafR5upxIMwGHCgarQd383fQfuXapPTH5hnOoyvwpGffLPhkP1UgaJB6DlUbt-cIjDuZGKtE3MLTpAy4HmIM_vWGZEjiGO42407Ffi86d8RcgG6z2 — 200 — 3.9 KiB — 54 ms — h2https://www.fca.org.uk/sites/default/files/css/css_gcj1YydFUcWwfuMH8AmOkPHPdGjrPsYbxF2toiSk5ms.css?delta=1&language=en&theme=fca&include=eJxtkE1ywzAIhS-kxIv2PhokY5sJAg1ISXP7ynaSbrrQ3_fQmwfYY1a9EY6jVCaQjBP-A-OMC3RuAX8ak9ym2XoFvr6eYckwfY167kViYs0n-v4ZTBpKO6EfdKy4dBHkBPkWHcHyFhe1cspkxfd_3gtadFqlqjeS9ZBX1gR88fbkN9rQNCYYjhapwIoHpd0imj5iBtPuyAdmaOgtCj58F-Yzk6PdafR5upxIMwGHCgarQd383fQfuXapPTH5hnOoyvwpGffLPhkP1UgaJB6DlUbt-cIjDuZGKtE3MLTpAy4HmIM_vWGZEjiGO42407Ffi86d8RcgG6z2www.fca.org.uk/sites/default/files/... https://www.fca.org.uk/sites/default/files/css/css_gcj1YydFUcWwfuMH8AmOkPHPdGjrPsYbxF2toiSk5ms.css?delta=1&language=en&theme=fca&include=eJxtkE1ywzAIhS-kxIv2PhokY5sJAg1ISXP7ynaSbrrQ3_fQmwfYY1a9EY6jVCaQjBP-A-OMC3RuAX8ak9ym2XoFvr6eYckwfY167kViYs0n-v4ZTBpKO6EfdKy4dBHkBPkWHcHyFhe1cspkxfd_3gtadFqlqjeS9ZBX1gR88fbkN9rQNCYYjhapwIoHpd0imj5iBtPuyAdmaOgtCj58F-Yzk6PdafR5upxIMwGHCgarQd383fQfuXapPTH5hnOoyvwpGffLPhkP1UgaJB6DlUbt-cIjDuZGKtE3MLTpAy4HmIM_vWGZEjiGO42407Ffi86d8RcgG6z2 — 200 — 57.1 KiB — 55 ms — h2https://www.fca.org.uk/themes/custom/fca/bootstrap/fonts/bootstrap/glyphicons-halflings-regular.woff2www.fca.org.uk/themes/custom/fca/bo... https://www.fca.org.uk/themes/custom/fca/bootstrap/fonts/bootstrap/glyphicons-halflings-regular.woff2 — 200 — 17.8 KiB — 29 ms — h2https://www.fca.org.uk/themes/custom/fca/images/logo.pngwww.fca.org.uk/themes/custom/fca/im... https://www.fca.org.uk/themes/custom/fca/images/logo.png — 200 — 8.6 KiB — 29 ms — h2https://www.fca.org.uk/sites/default/files/styles/landing_hero_desktop/public/media/images/home-desktop-image_1920-650-march24_q5.jpg.webp?itok=QESqq7G_www.fca.org.uk/sites/default/files/... https://www.fca.org.uk/sites/default/files/styles/landing_hero_desktop/public/media/images/home-desktop-image_1920-650-march24_q5.jpg.webp?itok=QESqq7G_ — 200 — 105.1 KiB — 70 ms — h2https://www.fca.org.uk/sites/default/files/styles/landing_hero_desktop/public/media/images/home-mobile-image_390_300-march24_q5.jpg.webp?itok=xgRhrlnuwww.fca.org.uk/sites/default/files/... https://www.fca.org.uk/sites/default/files/styles/landing_hero_desktop/public/media/images/home-mobile-image_390_300-march24_q5.jpg.webp?itok=xgRhrlnu — 200 — 16.0 KiB — 70 ms — h2https://www.fca.org.uk/themes/custom/fca/images/plain-numbers-logo.pngwww.fca.org.uk/themes/custom/fca/im... https://www.fca.org.uk/themes/custom/fca/images/plain-numbers-logo.png — 200 — 17.9 KiB — 30 ms — h2https://www.fca.org.uk/sites/default/files/js/js_ypVWssV0CM9DT4gWNPVSnIXB4K8TBFA8waH89FSsj7s.js?scope=footer&delta=0&language=en&theme=fca&include=eJyVkFFuwzAIhi_k1EdCmJLEimMsjLPt9nO9pdOk9KEPCPj4QUAQsWqKxYczgqIMMUdzT-SLFDlYHTcgkS1yd3tJETOxv4KOPy3FvPm7toLp9pu6mdB3g7nlzCkgbVAZlVaYRfdRXpIETFO1r96xDBRJcgWVDyBUaZXTA1-scknf0cJi-wt9zAdXqzuqnVUk4mLu_0H-L5ywmYwRbD9r9Ee28c5WpoBdp65fw2RRMtQVldU_wTTA_RsCCKZCwww.fca.org.uk/sites/default/files/... https://www.fca.org.uk/sites/default/files/js/js_ypVWssV0CM9DT4gWNPVSnIXB4K8TBFA8waH89FSsj7s.js?scope=footer&delta=0&language=en&theme=fca&include=eJyVkFFuwzAIhi_k1EdCmJLEimMsjLPt9nO9pdOk9KEPCPj4QUAQsWqKxYczgqIMMUdzT-SLFDlYHTcgkS1yd3tJETOxv4KOPy3FvPm7toLp9pu6mdB3g7nlzCkgbVAZlVaYRfdRXpIETFO1r96xDBRJcgWVDyBUaZXTA1-scknf0cJi-wt9zAdXqzuqnVUk4mLu_0H-L5ywmYwRbD9r9Ee28c5WpoBdp65fw2RRMtQVldU_wTTA_RsCCKZC — 200 — 55.7 KiB — 69 ms — h2https://www.fca.org.uk/sites/default/files/js/js_BksLUxT79TWZC538bs4bLSJ6R3Ytdy1WDz7oUXCwSoM.js?scope=footer&delta=2&language=en&theme=fca&include=eJyVkFFuwzAIhi_k1EdCmJLEimMsjLPt9nO9pdOk9KEPCPj4QUAQsWqKxYczgqIMMUdzT-SLFDlYHTcgkS1yd3tJETOxv4KOPy3FvPm7toLp9pu6mdB3g7nlzCkgbVAZlVaYRfdRXpIETFO1r96xDBRJcgWVDyBUaZXTA1-scknf0cJi-wt9zAdXqzuqnVUk4mLu_0H-L5ywmYwRbD9r9Ee28c5WpoBdp65fw2RRMtQVldU_wTTA_RsCCKZCwww.fca.org.uk/sites/default/files/... https://www.fca.org.uk/sites/default/files/js/js_BksLUxT79TWZC538bs4bLSJ6R3Ytdy1WDz7oUXCwSoM.js?scope=footer&delta=2&language=en&theme=fca&include=eJyVkFFuwzAIhi_k1EdCmJLEimMsjLPt9nO9pdOk9KEPCPj4QUAQsWqKxYczgqIMMUdzT-SLFDlYHTcgkS1yd3tJETOxv4KOPy3FvPm7toLp9pu6mdB3g7nlzCkgbVAZlVaYRfdRXpIETFO1r96xDBRJcgWVDyBUaZXTA1-scknf0cJi-wt9zAdXqzuqnVUk4mLu_0H-L5ywmYwRbD9r9Ee28c5WpoBdp65fw2RRMtQVldU_wTTA_RsCCKZC — 200 — 21.5 KiB — 71 ms — h2https://code.jquery.com/ui/1.14.1/jquery-ui.min.jscode.jquery.com/ui/1.14.1/jquery-ui... https://code.jquery.com/ui/1.14.1/jquery-ui.min.js — 200 — 65.8 KiB — 38 ms — h2https://www.fca.org.uk/sites/default/files/js/js_O4I22dHUn0OLydtg9PNAbWV2CB50n_u4UM70l6ftlss.js?scope=footer&delta=4&language=en&theme=fca&include=eJyVkFFuwzAIhi_k1EdCmJLEimMsjLPt9nO9pdOk9KEPCPj4QUAQsWqKxYczgqIMMUdzT-SLFDlYHTcgkS1yd3tJETOxv4KOPy3FvPm7toLp9pu6mdB3g7nlzCkgbVAZlVaYRfdRXpIETFO1r96xDBRJcgWVDyBUaZXTA1-scknf0cJi-wt9zAdXqzuqnVUk4mLu_0H-L5ywmYwRbD9r9Ee28c5WpoBdp65fw2RRMtQVldU_wTTA_RsCCKZCwww.fca.org.uk/sites/default/files/... https://www.fca.org.uk/sites/default/files/js/js_O4I22dHUn0OLydtg9PNAbWV2CB50n_u4UM70l6ftlss.js?scope=footer&delta=4&language=en&theme=fca&include=eJyVkFFuwzAIhi_k1EdCmJLEimMsjLPt9nO9pdOk9KEPCPj4QUAQsWqKxYczgqIMMUdzT-SLFDlYHTcgkS1yd3tJETOxv4KOPy3FvPm7toLp9pu6mdB3g7nlzCkgbVAZlVaYRfdRXpIETFO1r96xDBRJcgWVDyBUaZXTA1-scknf0cJi-wt9zAdXqzuqnVUk4mLu_0H-L5ywmYwRbD9r9Ee28c5WpoBdp65fw2RRMtQVldU_wTTA_RsCCKZC — 200 — 10.2 KiB — 69 ms — 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h2https://bam.nr-data.net/1/1bdb6f7fb8?a=1012956574&v=1.313.1&to=M11RYUQDWUVTVEcPDAoXcEBFFlhbHVJdEgoQQR1bWQZSGFFWXQkNDVtSWQwOVlhWXl0BPBRZVFA%3D&rst=608&ck=0&s=6c3e259ff3f0c520&ref=https://www.fca.org.uk/&ptid=f17e9f9f2c051581&af=err,spa,xhr,stn,ins&qt=34&ap=791&be=133&fe=442&dc=252&at=HxpGFwwZShoQVhFcGBlF&fsh=1&perf=%7B%22timing%22:%7B%22of%22:1776809668177,%22n%22:0,%22f%22:59,%22dn%22:60,%22dne%22:61,%22c%22:61,%22s%22:77,%22ce%22:99,%22rq%22:99,%22rp%22:134,%22rpe%22:137,%22di%22:328,%22ds%22:329,%22de%22:385,%22dc%22:572,%22l%22:572,%22le%22:575%7D,%22navigation%22:%7B%7D%7D&fp=320&fcp=320bam.nr-data.net/1/1bdb6f7fb8?a=1012... https://bam.nr-data.net/1/1bdb6f7fb8?a=1012956574&v=1.313.1&to=M11RYUQDWUVTVEcPDAoXcEBFFlhbHVJdEgoQQR1bWQZSGFFWXQkNDVtSWQwOVlhWXl0BPBRZVFA%3D&rst=608&ck=0&s=6c3e259ff3f0c520&ref=https://www.fca.org.uk/&ptid=f17e9f9f2c051581&af=err,spa,xhr,stn,ins&qt=34&ap=791&be=133&fe=442&dc=252&at=HxpGFwwZShoQVhFcGBlF&fsh=1&perf=%7B%22timing%22:%7B%22of%22:1776809668177,%22n%22:0,%22f%22:59,%22dn%22:60,%22dne%22:61,%22c%22:61,%22s%22:77,%22ce%22:99,%22rq%22:99,%22rp%22:134,%22rpe%22:137,%22di%22:328,%22ds%22:329,%22de%22:385,%22dc%22:572,%22l%22:572,%22le%22:575%7D,%22navigation%22:%7B%7D%7D&fp=320&fcp=320 — 200 — 676 B — 133 ms — http/1.1https://bam.nr-data.net/events/1/1bdb6f7fb8?a=1012956574&v=1.313.1&to=M11RYUQDWUVTVEcPDAoXcEBFFlhbHVJdEgoQQR1bWQZSGFFWXQkNDVtSWQwOVlhWXl0BPBRZVFA%3D&rst=750&ck=0&s=6c3e259ff3f0c520&ref=https://www.fca.org.uk/&ptid=f17e9f9f2c051581bam.nr-data.net/events/1/1bdb6f7fb8... https://bam.nr-data.net/events/1/1bdb6f7fb8?a=1012956574&v=1.313.1&to=M11RYUQDWUVTVEcPDAoXcEBFFlhbHVJdEgoQQR1bWQZSGFFWXQkNDVtSWQwOVlhWXl0BPBRZVFA%3D&rst=750&ck=0&s=6c3e259ff3f0c520&ref=https://www.fca.org.uk/&ptid=f17e9f9f2c051581 — 200 — 416 B — 99 ms — http/1.1https://bam.nr-data.net/jserrors/1/1bdb6f7fb8?a=1012956574&v=1.313.1&to=M11RYUQDWUVTVEcPDAoXcEBFFlhbHVJdEgoQQR1bWQZSGFFWXQkNDVtSWQwOVlhWXl0BPBRZVFA%3D&rst=752&ck=0&s=6c3e259ff3f0c520&ref=https://www.fca.org.uk/&ptid=f17e9f9f2c051581bam.nr-data.net/jserrors/1/1bdb6f7f... https://bam.nr-data.net/jserrors/1/1bdb6f7fb8?a=1012956574&v=1.313.1&to=M11RYUQDWUVTVEcPDAoXcEBFFlhbHVJdEgoQQR1bWQZSGFFWXQkNDVtSWQwOVlhWXl0BPBRZVFA%3D&rst=752&ck=0&s=6c3e259ff3f0c520&ref=https://www.fca.org.uk/&ptid=f17e9f9f2c051581 — 200 — 416 B — 108 ms — http/1.1https://bam.nr-data.net/events/1/1bdb6f7fb8?a=1012956574&v=1.313.1&to=M11RYUQDWUVTVEcPDAoXcEBFFlhbHVJdEgoQQR1bWQZSGFFWXQkNDVtSWQwOVlhWXl0BPBRZVFA%3D&rst=753&ck=0&s=6c3e259ff3f0c520&ref=https://www.fca.org.uk/&ptid=f17e9f9f2c051581bam.nr-data.net/events/1/1bdb6f7fb8... https://bam.nr-data.net/events/1/1bdb6f7fb8?a=1012956574&v=1.313.1&to=M11RYUQDWUVTVEcPDAoXcEBFFlhbHVJdEgoQQR1bWQZSGFFWXQkNDVtSWQwOVlhWXl0BPBRZVFA%3D&rst=753&ck=0&s=6c3e259ff3f0c520&ref=https://www.fca.org.uk/&ptid=f17e9f9f2c051581 — 200 — 416 B — 100 ms — http/1.1
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 199ms · 231KB · £2/mo
www.fca.org.uk
Other
Optional
Execution 120ms
Transfer 46 KB
Monthly Cost £1/mo
Google Tag Manager
Tag Manager
Optional
Execution 79ms
Transfer 185 KB
Unused 42%
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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