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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
86
GRADE
B
FIX
2
REVIEW
3
PASS
10
INFO
2

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

Mobile Desktop
78
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.

2.28 s

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

3.95 s

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

320 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.

2.28 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.

6.88 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
10 PASS 3 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 (594.4 KiB of 594.4 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
24 images, 0 KB saveable
REVIEW
24 images, 0 KB saveable
Info::
All images are well-optimized
24 images 98 KB
0 oversized -0 KB
13 legacy format
0 missing dimensions CLS risk
C
JS Execution Cost
Action
1433ms total JS execution
REVIEW
1433ms total JS execution
Warning::
https://www.fca.org.uk/: 541ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-PCC...: 274ms CPU time
Warning::
Unattributable: 251ms CPU time
Info::
https://www.fca.org.uk/sites/default/files/js/js_y...: 181ms CPU time
Info::
https://js-agent.newrelic.com/nr-spa-1.313.1.min.j...: 135ms CPU time
Warning::
Third-party scripts: 1433ms (100% of total)

Main Thread Breakdown

Script Evaluation 50% Other 20% Style & Layout 13% Script Parsing & Compilation 8% Parse HTML & CSS 5%
ScriptTotalScriptingParse/CompileParty
https://www.fca.org.uk/541ms328ms16ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-PCC62S274ms221ms49ms3rd
Unattributable251ms6ms0ms3rd
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_RsCCKZC181ms47ms12ms3rd
https://js-agent.newrelic.com/nr-spa-1.313.1.min.js135ms109ms9ms3rd
https://code.jquery.com/ui/1.14.1/jquery-ui.min.js52ms29ms21ms3rd
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_RsCCKZC21 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
594 KB transferred, 42 requests
PASS
594 KB transferred, 42 requests
Info::
Page weighs 1.9 MB (594 KB transferred)
Info::
42 HTTP requests
Info::
Estimated 0.12 g CO2 per page load
594 KB / 2.4 MB budget
594 KB transferred
42 requests
0.12 g CO2 per page load
JavaScript 368.8 KiB 62%
Images 98.2 KiB 17%
CSS 61.0 KiB 10%
HTML 45.7 KiB 8%
Fonts 17.9 KiB 3%
Other 1.9 KiB 0%
Other 943 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+
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 1.0 s 2.0 s 3.0 s 4.0 s FCP 2.3 s LCP 3.9 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 — 17.9 KiB — 32 ms — font-display: swap
glyphicons-halflings-re... woff2 swap
Size 18 KB
Load time 32 ms
Start 160 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
Page Weight Inventory
42 resources · 594 KB · 163 KB savings available
PASS
42 resources · 594 KB · 163 KB savings available
Info::
Within 1MB page-weight target
Got: 594 KB
Info::
~163 KB of savings available
Warning::
41 third-party resources (100% of weight)
42 resources · 594.4 KiB · 41 third-party Within 1MB page-weight target
JavaScript 62% · 368.8 KiB
Image 17% · 100.3 KiB
CSS 10% · 61.0 KiB
Document 8% · 45.7 KiB
Font 3% · 17.9 KiB
Other 0% · 771 B

~163.3 KiB of savings available

Remove unused JavaScript: 163.3 KiB
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

Network Waterfall
42 requests over 1344ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 2.3 s LCP 3.9 shttps://fca.org.uk// https://fca.org.uk/ — 301 — 95 B — 63 ms — h2https://www.fca.org.uk/www.fca.org.uk/ https://www.fca.org.uk/ — 200 — 45.7 KiB — 84 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 — 506 B — 71 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 — 34 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 — 64 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 — 17.9 KiB — 32 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 — 8.5 KiB — 35 ms — h2https://www.fca.org.uk/sites/default/files/styles/landing_hero_mobile/public/media/images/home-desktop-image_1920-650-march24_q5.jpg.webp?itok=6EXI_mWAwww.fca.org.uk/sites/default/files/... https://www.fca.org.uk/sites/default/files/styles/landing_hero_mobile/public/media/images/home-desktop-image_1920-650-march24_q5.jpg.webp?itok=6EXI_mWA — 200 — 13.9 KiB — 37 ms — h2https://www.fca.org.uk/sites/default/files/styles/landing_hero_mobile/public/media/images/home-mobile-image_390_300-march24_q5.jpg.webp?itok=R0p55jCAwww.fca.org.uk/sites/default/files/... https://www.fca.org.uk/sites/default/files/styles/landing_hero_mobile/public/media/images/home-mobile-image_390_300-march24_q5.jpg.webp?itok=R0p55jCA — 200 — 16.6 KiB — 63 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 — 63 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 — 67 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 — 21.4 KiB — 68 ms — h2https://code.jquery.com/ui/1.14.1/jquery-ui.min.jscode.jquery.com/ui/1.14.1/jquery-ui... 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h2https://www.fca.org.uk/sites/default/files/styles/landing_text_promo_mobile/public/media/images/my-fca-banner.jpg.webp?itok=zA3-ysJ8www.fca.org.uk/sites/default/files/... https://www.fca.org.uk/sites/default/files/styles/landing_text_promo_mobile/public/media/images/my-fca-banner.jpg.webp?itok=zA3-ysJ8 — 200 — 15.0 KiB — 37 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-PCC62Swww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-PCC62S — 200 — 184.8 KiB — 176 ms — h2https://www.fca.org.uk/themes/custom/fca/assets/img/carousel-left.svgwww.fca.org.uk/themes/custom/fca/as... https://www.fca.org.uk/themes/custom/fca/assets/img/carousel-left.svg — 200 — 306 B — 45 ms — h2https://www.fca.org.uk/themes/custom/fca/assets/img/carousel-right.svgwww.fca.org.uk/themes/custom/fca/as... https://www.fca.org.uk/themes/custom/fca/assets/img/carousel-right.svg — 200 — 262 B — 56 ms — h2https://js-agent.newrelic.com/nr-spa-1.313.1.min.jsjs-agent.newrelic.com/nr-spa-1.313.... https://js-agent.newrelic.com/nr-spa-1.313.1.min.js — 200 — 30.3 KiB — 27 ms — h2https://www.fca.org.uk/themes/custom/fca/favicon.icowww.fca.org.uk/themes/custom/fca/fa... https://www.fca.org.uk/themes/custom/fca/favicon.ico — 200 — 848 B — 28 ms — h2https://bam.nr-data.net/1/1bdb6f7fb8?a=1012956574&v=1.313.1&to=M11RYUQDWUVTVEcPDAoXcEBFFlhbHVJdEgoQQR1bWQZSGFFWXQkNDVtSWQwOVlhWXl0BPBRZVFA%3D&rst=650&ck=0&s=62c9171491e27cf2&ref=https://www.fca.org.uk/&ptid=0fe934bd1fccd364&af=err,spa,xhr,stn,ins&qt=34&ap=791&be=145&fe=461&dc=296&at=HxpGFwwZShoQVhFcGBlF&fsh=1&perf=%7B%22timing%22:%7B%22of%22:1776809648075,%22n%22:0,%22f%22:64,%22dn%22:65,%22dne%22:71,%22c%22:71,%22s%22:88,%22ce%22:112,%22rq%22:112,%22rp%22:146,%22rpe%22:149,%22di%22:353,%22ds%22:354,%22de%22:441,%22dc%22:603,%22l%22:603,%22le%22:606%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=650&ck=0&s=62c9171491e27cf2&ref=https://www.fca.org.uk/&ptid=0fe934bd1fccd364&af=err,spa,xhr,stn,ins&qt=34&ap=791&be=145&fe=461&dc=296&at=HxpGFwwZShoQVhFcGBlF&fsh=1&perf=%7B%22timing%22:%7B%22of%22:1776809648075,%22n%22:0,%22f%22:64,%22dn%22:65,%22dne%22:71,%22c%22:71,%22s%22:88,%22ce%22:112,%22rq%22:112,%22rp%22:146,%22rpe%22:149,%22di%22:353,%22ds%22:354,%22de%22:441,%22dc%22:603,%22l%22:603,%22le%22:606%7D,%22navigation%22:%7B%7D%7D&fp=320&fcp=320 — 200 — 676 B — 570 ms — http/1.1https://bam.nr-data.net/events/1/1bdb6f7fb8?a=1012956574&v=1.313.1&to=M11RYUQDWUVTVEcPDAoXcEBFFlhbHVJdEgoQQR1bWQZSGFFWXQkNDVtSWQwOVlhWXl0BPBRZVFA%3D&rst=1230&ck=0&s=62c9171491e27cf2&ref=https://www.fca.org.uk/&ptid=0fe934bd1fccd364bam.nr-data.net/events/1/1bdb6f7fb8... https://bam.nr-data.net/events/1/1bdb6f7fb8?a=1012956574&v=1.313.1&to=M11RYUQDWUVTVEcPDAoXcEBFFlhbHVJdEgoQQR1bWQZSGFFWXQkNDVtSWQwOVlhWXl0BPBRZVFA%3D&rst=1230&ck=0&s=62c9171491e27cf2&ref=https://www.fca.org.uk/&ptid=0fe934bd1fccd364 — 200 — 416 B — 108 ms — http/1.1https://bam.nr-data.net/jserrors/1/1bdb6f7fb8?a=1012956574&v=1.313.1&to=M11RYUQDWUVTVEcPDAoXcEBFFlhbHVJdEgoQQR1bWQZSGFFWXQkNDVtSWQwOVlhWXl0BPBRZVFA%3D&rst=1231&ck=0&s=62c9171491e27cf2&ref=https://www.fca.org.uk/&ptid=0fe934bd1fccd364bam.nr-data.net/jserrors/1/1bdb6f7f... https://bam.nr-data.net/jserrors/1/1bdb6f7fb8?a=1012956574&v=1.313.1&to=M11RYUQDWUVTVEcPDAoXcEBFFlhbHVJdEgoQQR1bWQZSGFFWXQkNDVtSWQwOVlhWXl0BPBRZVFA%3D&rst=1231&ck=0&s=62c9171491e27cf2&ref=https://www.fca.org.uk/&ptid=0fe934bd1fccd364 — 200 — 416 B — 106 ms — http/1.1https://bam.nr-data.net/events/1/1bdb6f7fb8?a=1012956574&v=1.313.1&to=M11RYUQDWUVTVEcPDAoXcEBFFlhbHVJdEgoQQR1bWQZSGFFWXQkNDVtSWQwOVlhWXl0BPBRZVFA%3D&rst=1233&ck=0&s=62c9171491e27cf2&ref=https://www.fca.org.uk/&ptid=0fe934bd1fccd364bam.nr-data.net/events/1/1bdb6f7fb8... https://bam.nr-data.net/events/1/1bdb6f7fb8?a=1012956574&v=1.313.1&to=M11RYUQDWUVTVEcPDAoXcEBFFlhbHVJdEgoQQR1bWQZSGFFWXQkNDVtSWQwOVlhWXl0BPBRZVFA%3D&rst=1233&ck=0&s=62c9171491e27cf2&ref=https://www.fca.org.uk/&ptid=0fe934bd1fccd364 — 200 — 416 B — 111 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 1433ms · 382KB · £15/mo
www.fca.org.uk
Other
Costly
Execution 541ms
Transfer 46 KB
Monthly Cost £6/mo
Google Tag Manager
Tag Manager
Costly
Execution 274ms
Transfer 185 KB
Unused 42%
Monthly Cost £3/mo
Unattributable
Other
Costly
Execution 251ms
Transfer 0 KB
Monthly Cost £3/mo
www.fca.org.uk
Other
Optional
Execution 181ms
Transfer 56 KB
Unused 52%
Monthly Cost £2/mo
js-agent.newrelic.com
Other
Optional
Execution 135ms
Transfer 30 KB
Monthly Cost £1/mo
code.jquery.com
Other
Optional
Execution 52ms
Transfer 66 KB
Unused 87%
Monthly Cost £1/mo

These scripts may cost more than they're worth

  • www.fca.org.uk adds 541ms and costs ~£6/month
  • Google Tag Manager adds 274ms and costs ~£3/month
  • Unattributable adds 251ms 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

www.fca.org.uk takes 541ms 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 274ms 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 251ms 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

52% of www.fca.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

87% of code.jquery.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

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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