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https://bsigroup.com

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
69
GRADE
D
FIX
6
REVIEW
2
PASS
7
INFO
2

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

Mobile Desktop
36
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
92
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.

5.49 s

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

6.05 s

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

1.69 s

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

0.004

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

6.42 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.

16.01 s

Page Load Progression

378 ms
756 ms
1.1 s
1.5 s
1.9 s
2.3 s
2.6 s
3.0 s
Checks
17
7 PASS 2 REVIEW 6 FIX
F
Page Weight Budget
Action
3.6 MB transferred, 120 requests
FIX
3.6 MB transferred, 120 requests
Warning::
Page weighs 12.0 MB (3.6 MB transferred)
Warning::
JavaScript is 2.4 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 2.4 MB
Warning::
120 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.76 g CO2 per page load
3.6 MB / 2.4 MB budget
3.6 MB transferred
120 requests
0.76 g CO2 per page load
JavaScript 2.4 MiB 67%
Images 720.3 KiB 19%
CSS 193.5 KiB 5%
HTML 125.3 KiB 3%
Fonts 119.0 KiB 3%
Other 72.8 KiB 2%
Other 10.1 KiB 0%
Other 7.6 KiB 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

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

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

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 (3.6 MiB of 3.6 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
7782ms total JS execution
FIX
7782ms total JS execution
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 1239ms CPU time
Warning::
https://www.bsigroup.com/build/assets/swiper-bundl...: 1162ms CPU time
Warning::
https://edge.eu1.fullstory.com/s/fs.js: 1116ms CPU time
Warning::
Unattributable: 1084ms CPU time
Warning::
https://www.bsigroup.com/: 1073ms CPU time
Warning::
Third-party scripts: 7782ms (100% of total)

Main Thread Breakdown

Script Evaluation 54% Other 22% Style & Layout 10% Script Parsing & Compilation 6%
ScriptTotalScriptingParse/CompileParty
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js1239ms1027ms128ms3rd
https://www.bsigroup.com/build/assets/swiper-bundle-r8-hi7mH.js1162ms395ms1ms3rd
https://edge.eu1.fullstory.com/s/fs.js1116ms938ms40ms3rd
Unattributable1084ms21ms0ms3rd
https://www.bsigroup.com/1073ms121ms35ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WX52CM751ms642ms94ms3rd
https://cdn.cookielaw.org/scripttemplates/202510.2.0/otBannerSdk.js519ms338ms101ms3rd
https://cdn.optimizely.com/js/24631140947.js406ms328ms44ms3rd
https://www.dwin1.com/25134.js102ms77ms22ms3rd
https://static.ads-twitter.com/uwt.js89ms82ms6ms3rd

Showing top 10 of 14 scripts

F
JS Bundles
Action
53 scripts, 954 KB unused
FIX
53 scripts, 954 KB unused
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 177 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 177 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 177 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 177 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.cookielaw.org/scripttemplates/202510.2...: 65 KB unused (52%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 954 KB
954 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js0 KB177 KB (49%)✓3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js0 KB177 KB (49%)✓3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js362 KB177 KB (49%)✓3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js362 KB177 KB (49%)✓3rd
https://cdn.cookielaw.org/scripttemplates/202510.2.0/otBannerSdk.js124 KB65 KB (52%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WX52CM187 KB60 KB (32%)✓3rd
https://cdn.optimizely.com/js/24631140947.js99 KB49 KB (49%)✓3rd
https://edge.eu1.fullstory.com/s/fs.js80 KB27 KB (34%)✓3rd
https://www.bsigroup.com/build/assets/swiper-bundle-r8-hi7mH.js44 KB24 KB (56%)✓3rd
https://www.bsigroup.com/ui/js/libs/jquery-3.5.1.min.js31 KB23 KB (75%)✓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
120 resources · 3.6 MB · 954 KB savings available
FIX
120 resources · 3.6 MB · 954 KB savings available
Warning::
Page weight 2.6 MB over 1MB target
Got: 3.6 MB Expected: ≤ 1 MB
Info::
~954 KB of savings available
Warning::
119 third-party resources (100% of weight)
Info::
3 resources over 200KB
120 resources · 3.6 MiB · 119 third-party 2.6 MiB over 1MB target
JavaScript 67% · 2.4 MiB
Image 20% · 730.7 KiB
CSS 5% · 198.1 KiB
Document 3% · 125.3 KiB
Font 3% · 119.0 KiB
Other 2% · 75.5 KiB

~954.1 KiB of savings available

Remove unused JavaScript: 954.1 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
28 images, 0 KB saveable
REVIEW
28 images, 0 KB saveable
Info::
All images are well-optimized
28 images 720 KB
0 oversized -0 KB
15 legacy format
0 missing dimensions CLS risk
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
4 fonts (119 KB)
PASS
4 fonts (119 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

119 KB total

Render-blocking

0

of 4

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 5.0 s 6.0 s FCP 5.5 s LCP 6.1 shttps://fonts.gstatic.com/s/notosans/v42/o-0bIpQlx3QUlC5A4PNB6Ryti20_6n1iPHjc5a7du3mhPy0.woff2o-0bIpQlx3QUlC5A4PNB6Ry... https://fonts.gstatic.com/s/notosans/v42/o-0bIpQlx3QUlC5A4PNB6Ryti20_6n1iPHjc5a7du3mhPy0.woff2 — 35.0 KiB — 25 ms — font-display: swaphttps://fonts.gstatic.com/s/notoserif/v33/ga6daw1J5X9T9RW6j9bNVls-hfgvz8JcMofYTYf6D33WsNFH.woff2ga6daw1J5X9T9RW6j9bNVls... https://fonts.gstatic.com/s/notoserif/v33/ga6daw1J5X9T9RW6j9bNVls-hfgvz8JcMofYTYf6D33WsNFH.woff2 — 35.9 KiB — 39 ms — font-display: swaphttps://fonts.gstatic.com/s/notosans/v42/o-0bIpQlx3QUlC5A4PNB6Ryti20_6n1iPHjc5aHdu3mhPy1Fig.woff2o-0bIpQlx3QUlC5A4PNB6Ry... https://fonts.gstatic.com/s/notosans/v42/o-0bIpQlx3QUlC5A4PNB6Ryti20_6n1iPHjc5aHdu3mhPy1Fig.woff2 — 14.2 KiB — 7 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 67 ms — font-display: swap
o-0bIpQlx3QUlC5A4PNB6Ry... woff2 swap
Size 35 KB
Load time 25 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
ga6daw1J5X9T9RW6j9bNVls... woff2 swap
Size 36 KB
Load time 39 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
o-0bIpQlx3QUlC5A4PNB6Ry... woff2 swap
Size 14 KB
Load time 7 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 34 KB
Load time 67 ms
Start 2.1 s
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
4 hints, 0 missing preconnects
PASS
4 hints, 0 missing preconnects
Info::
Page uses 4 resource hint(s)

Current Resource Hints

preconnect
2
preload
2
dns-prefetch
—
prefetch
—

4 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
120 requests over 6217ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s FCP 5.5 s LCP 6.1 shttps://bsigroup.com// https://bsigroup.com/ — 301 — 202 B — 817 ms — http/1.1https://www.bsigroup.com/www.bsigroup.com/ https://www.bsigroup.com/ — 200 — 39.5 KiB — 28 ms — h2https://www.bsigroup.com/ui/js/libs/jquery-3.5.1.min.jswww.bsigroup.com/ui/js/libs/jquery-... https://www.bsigroup.com/ui/js/libs/jquery-3.5.1.min.js — 200 — 30.7 KiB — 22 ms — h2https://cdn.optimizely.com/js/24631140947.jscdn.optimizely.com/js/24631140947.j... https://cdn.optimizely.com/js/24631140947.js — 200 — 99.2 KiB — 41 ms — h2https://cdn.cookielaw.org/consent/90e9269f-721c-47d4-8fbd-c5da21075dc6/OtAutoBlock.jscdn.cookielaw.org/consent/90e9269f-... https://cdn.cookielaw.org/consent/90e9269f-721c-47d4-8fbd-c5da21075dc6/OtAutoBlock.js — 200 — 5.3 KiB — 93 ms — h2https://cdn.cookielaw.org/consent/90e9269f-721c-47d4-8fbd-c5da21075dc6/otSDKStub.jscdn.cookielaw.org/consent/90e9269f-... https://cdn.cookielaw.org/consent/90e9269f-721c-47d4-8fbd-c5da21075dc6/otSDKStub.js — 200 — 9.7 KiB — 78 ms — h2https://fonts.googleapis.com/css2?family=Noto+Sans:wght@300..700&family=Noto+Serif:wght@300..700&display=swapfonts.googleapis.com/css2?family=No... https://fonts.googleapis.com/css2?family=Noto+Sans:wght@300..700&family=Noto+Serif:wght@300..700&display=swap — 200 — 1.6 KiB — 130 ms — h2https://www.bsigroup.com/build/app.css?1.0.131www.bsigroup.com/build/app.css?1.0.... https://www.bsigroup.com/build/app.css?1.0.131 — 200 — 46.4 KiB — 35 ms — h2https://www.google.com/recaptcha/api.jswww.google.com/recaptcha/api.js https://www.google.com/recaptcha/api.js — 200 — 1012 B — 115 ms — h3https://api.ipify.org/?format=jsonp&callback=checkIPCountryapi.ipify.org/?format=jsonp&callbac... https://api.ipify.org/?format=jsonp&callback=checkIPCountry — 200 — 175 B — 145 ms — h2https://www.bsigroup.com/siteassets/images/16-7-hro/gl-grp-cross-brand-nss-nst-nsp-mp-01125bsiwebsiteheadersustainability-0024-img.jpg?imwidth=420&imdensity=2www.bsigroup.com/siteassets/images/... https://www.bsigroup.com/siteassets/images/16-7-hro/gl-grp-cross-brand-nss-nst-nsp-mp-01125bsiwebsiteheadersustainability-0024-img.jpg?imwidth=420&imdensity=2 — 200 — 96.5 KiB — 21 ms — h2https://www.bsigroup.com/build/app2.js?1.0.131www.bsigroup.com/build/app2.js?1.0.... https://www.bsigroup.com/build/app2.js?1.0.131 — 200 — 3.1 KiB — 14 ms — h2https://js.maxmind.com/js/apis/geoip2/v2.1/geoip2.jsjs.maxmind.com/js/apis/geoip2/v2.1/... https://js.maxmind.com/js/apis/geoip2/v2.1/geoip2.js — 200 — 1.6 KiB — 36 ms — h3https://cdn.cookielaw.org/consent/90e9269f-721c-47d4-8fbd-c5da21075dc6/90e9269f-721c-47d4-8fbd-c5da21075dc6.jsoncdn.cookielaw.org/consent/90e9269f-... https://cdn.cookielaw.org/consent/90e9269f-721c-47d4-8fbd-c5da21075dc6/90e9269f-721c-47d4-8fbd-c5da21075dc6.json — 200 — 2.4 KiB — 27 ms — h2https://digitalfeedback.euro.confirmit.com/api/digitalfeedback/loader?programKey=qCwM78digitalfeedback.euro.confirmit.com/... https://digitalfeedback.euro.confirmit.com/api/digitalfeedback/loader?programKey=qCwM78 — 200 — 1.3 KiB — 430 ms — h2https://www.googletagmanager.com/gtag/js?id=AW-1001589842www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=AW-1001589842 — 200 — 137.5 KiB — 280 ms — h2https://www.googletagmanager.com/gtag/js?id=AW-940899034www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=AW-940899034 — 200 — 149.3 KiB — 263 ms — h2https://www.bsigroup.com/Areas/v1/UI/images/logos/bsi-logo.svgwww.bsigroup.com/Areas/v1/UI/images... https://www.bsigroup.com/Areas/v1/UI/images/logos/bsi-logo.svg — 200 — 1.4 KiB — 53 ms — h2https://www.bsigroup.com/siteassets/1-placeholder/bsi-logo-125.pngwww.bsigroup.com/siteassets/1-place... https://www.bsigroup.com/siteassets/1-placeholder/bsi-logo-125.png — 200 — 1.9 KiB — 74 ms — h2https://www.bsigroup.com/siteassets/1-placeholder/bsi-logo.jpgwww.bsigroup.com/siteassets/1-place... https://www.bsigroup.com/siteassets/1-placeholder/bsi-logo.jpg — 200 — 1.7 KiB — 54 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-WX52CMwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-WX52CM — 200 — 187.2 KiB — 274 ms — h2https://page.bsigroup.com/pdt.jspage.bsigroup.com/pdt.js https://page.bsigroup.com/pdt.js — 200 — 4.4 KiB — 544 ms — http/1.1https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.jswww.gstatic.com/recaptcha/releases/... https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js — 200 — 362.4 KiB — 162 ms — h2https://bsi.my.site.com/ESWGBGroupPreChat1751383749350vforcesite/services/apexrest/api/office/chat_configbsi.my.site.com/ESWGBGroupPreChat17... https://bsi.my.site.com/ESWGBGroupPreChat1751383749350vforcesite/services/apexrest/api/office/chat_config — 200 — 1.3 KiB — 654 ms — h2https://a24631140947.cdn.optimizely.com/client_storage/a24631140947.htmla24631140947.cdn.optimizely.com/cli... https://a24631140947.cdn.optimizely.com/client_storage/a24631140947.html — 200 — 1.5 KiB — 75 ms — h2https://geolocation.onetrust.com/cookieconsentpub/v1/geo/locationgeolocation.onetrust.com/cookiecons... https://geolocation.onetrust.com/cookieconsentpub/v1/geo/location — 200 — 285 B — 88 ms — h2https://www.bsigroup.com/Areas/v1/UI/images/icons/icon-language.svgwww.bsigroup.com/Areas/v1/UI/images... https://www.bsigroup.com/Areas/v1/UI/images/icons/icon-language.svg — 200 — 1.0 KiB — 53 ms — h2https://www.bsigroup.com/Areas/v1/UI/images/icons/icon-search.svgwww.bsigroup.com/Areas/v1/UI/images... https://www.bsigroup.com/Areas/v1/UI/images/icons/icon-search.svg — 200 — 793 B — 44 ms — h2https://www.bsigroup.com/Areas/v1/UI/images/icons/icon-menu.svgwww.bsigroup.com/Areas/v1/UI/images... https://www.bsigroup.com/Areas/v1/UI/images/icons/icon-menu.svg — 200 — 673 B — 55 ms — h2https://www.bsigroup.com/Areas/v1/UI/images/icons/icon-arrow-back.svgwww.bsigroup.com/Areas/v1/UI/images... https://www.bsigroup.com/Areas/v1/UI/images/icons/icon-arrow-back.svg — 200 — 680 B — 43 ms — h2
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s FCP 5.5 s LCP 6.1 shttps://bsigroup.com// https://bsigroup.com/ — 301 — 202 B — 817 ms — http/1.1https://www.bsigroup.com/www.bsigroup.com/ https://www.bsigroup.com/ — 200 — 39.5 KiB — 28 ms — h2https://www.bsigroup.com/ui/js/libs/jquery-3.5.1.min.jswww.bsigroup.com/ui/js/libs/jquery-... https://www.bsigroup.com/ui/js/libs/jquery-3.5.1.min.js — 200 — 30.7 KiB — 22 ms — h2https://cdn.optimizely.com/js/24631140947.jscdn.optimizely.com/js/24631140947.j... https://cdn.optimizely.com/js/24631140947.js — 200 — 99.2 KiB — 41 ms — h2https://cdn.cookielaw.org/consent/90e9269f-721c-47d4-8fbd-c5da21075dc6/OtAutoBlock.jscdn.cookielaw.org/consent/90e9269f-... https://cdn.cookielaw.org/consent/90e9269f-721c-47d4-8fbd-c5da21075dc6/OtAutoBlock.js — 200 — 5.3 KiB — 93 ms — h2https://cdn.cookielaw.org/consent/90e9269f-721c-47d4-8fbd-c5da21075dc6/otSDKStub.jscdn.cookielaw.org/consent/90e9269f-... 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https://cdn.cookielaw.org/scripttemplates/202510.2.0/assets/otCenterRounded.json — 200 — 2.9 KiB — 12 ms — h2https://cdn.cookielaw.org/scripttemplates/202510.2.0/assets/v2/otPcCenter.jsoncdn.cookielaw.org/scripttemplates/2... https://cdn.cookielaw.org/scripttemplates/202510.2.0/assets/v2/otPcCenter.json — 200 — 13.2 KiB — 21 ms — h2https://cdn.cookielaw.org/scripttemplates/202510.2.0/assets/otCookieSettingsButton.jsoncdn.cookielaw.org/scripttemplates/2... https://cdn.cookielaw.org/scripttemplates/202510.2.0/assets/otCookieSettingsButton.json — 200 — 1.9 KiB — 19 ms — h2https://cdn.cookielaw.org/scripttemplates/202510.2.0/assets/otCommonStyles.csscdn.cookielaw.org/scripttemplates/2... https://cdn.cookielaw.org/scripttemplates/202510.2.0/assets/otCommonStyles.css — 200 — 4.6 KiB — 17 ms — h2https://t.co/i/adsct?bci=3&dv=UTC%26en-US%2Cen%26Google%20Inc.%26Linux%20x86_64%26255%26412%26823%264%2624%26412%26823%261%26na&eci=2&event_id=5debff3a-0ae1-4949-9e91-5c19c4c38bbe&events=%5B%5B%22pageview%22%2C%7B%7D%5D%5D&integration=advertiser&p_id=Twitter&p_user_id=0&pl_id=27e6ff62-b242-45cd-a4ef-22d813019993&pt=Accelerating%20Progress%20Towards%20a%20Sustainable%20World%20%7C%20BSI&tw_document_href=https%3A%2F%2Fwww.bsigroup.com%2F&tw_iframe_status=0&tw_order_quantity=0&tw_pid_src=1&tw_sale_amount=0&twpid=tw.1776888067457.593197643210216107&txn_id=o3umf&type=javascript&version=2.3.53t.co/i/adsct?bci=3&dv=UTC%26en-US%2... https://t.co/i/adsct?bci=3&dv=UTC%26en-US%2Cen%26Google%20Inc.%26Linux%20x86_64%26255%26412%26823%264%2624%26412%26823%261%26na&eci=2&event_id=5debff3a-0ae1-4949-9e91-5c19c4c38bbe&events=%5B%5B%22pageview%22%2C%7B%7D%5D%5D&integration=advertiser&p_id=Twitter&p_user_id=0&pl_id=27e6ff62-b242-45cd-a4ef-22d813019993&pt=Accelerating%20Progress%20Towards%20a%20Sustainable%20World%20%7C%20BSI&tw_document_href=https%3A%2F%2Fwww.bsigroup.com%2F&tw_iframe_status=0&tw_order_quantity=0&tw_pid_src=1&tw_sale_amount=0&twpid=tw.1776888067457.593197643210216107&txn_id=o3umf&type=javascript&version=2.3.53 — -1 — 0 B — 5 ms — https://www.google.com/recaptcha/api2/webworker.js?hl=en&v=gTpTIWhbKpxADzTzkcabhXN4www.google.com/recaptcha/api2/webwo... https://www.google.com/recaptcha/api2/webworker.js?hl=en&v=gTpTIWhbKpxADzTzkcabhXN4 — 200 — 23 B — 356 ms — h3https://cdn.cookielaw.org/logos/static/ot_guard_logo.svgcdn.cookielaw.org/logos/static/ot_g... https://cdn.cookielaw.org/logos/static/ot_guard_logo.svg — 200 — 495 B — 13 ms — h2https://cdn.cookielaw.org/logos/1ee5f555-266a-4ab6-86d3-7ae489726054/3c0aac6d-e8c4-44f6-bd32-b7e9c476e142/06af568c-0e49-4a75-8bcb-77521d403d8c/BSI.jpgcdn.cookielaw.org/logos/1ee5f555-26... https://cdn.cookielaw.org/logos/1ee5f555-266a-4ab6-86d3-7ae489726054/3c0aac6d-e8c4-44f6-bd32-b7e9c476e142/06af568c-0e49-4a75-8bcb-77521d403d8c/BSI.jpg — 200 — 2.5 KiB — 21 ms — h2https://cdn.cookielaw.org/logos/static/powered_by_logo.svgcdn.cookielaw.org/logos/static/powe... https://cdn.cookielaw.org/logos/static/powered_by_logo.svg — 200 — 2.6 KiB — 23 ms — h2https://logx.optimizely.com/v1/eventslogx.optimizely.com/v1/events https://logx.optimizely.com/v1/events — 204 — 387 B — 154 ms — h2https://www.youtube.com/s/player/1bb6ee63/www-player.csswww.youtube.com/s/player/1bb6ee63/w... https://www.youtube.com/s/player/1bb6ee63/www-player.css — 200 — 58.0 KiB — 259 ms — h2https://www.youtube.com/s/_/ytembeds/_/ss/k=ytembeds.base.KjNKUXigSn8.L.W.O/am=AAAABA/d=0/br=1/rs=AGKMywEJITLW9kQSSYb_eVLtSgu_4tU6CQwww.youtube.com/s/_/ytembeds/_/ss/k... https://www.youtube.com/s/_/ytembeds/_/ss/k=ytembeds.base.KjNKUXigSn8.L.W.O/am=AAAABA/d=0/br=1/rs=AGKMywEJITLW9kQSSYb_eVLtSgu_4tU6CQ — 200 — 45.3 KiB — 304 ms — h2https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2fonts.gstatic.com/s/roboto/v48/KFO7... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 200 — 33.9 KiB — 67 ms — h3https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.jswww.gstatic.com/recaptcha/releases/... https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js — 200 — 0 B — 24 ms — h2https://www.youtube.com/s/_/ytembeds/_/js/k=ytembeds.base.en_US.5f0apfZzpOA.2021.O/am=AAAABA/d=1/br=1/rs=AGKMywFg3MG1UeKh8ePjbhY_YEMv-NHjmA/m=root,basewww.youtube.com/s/_/ytembeds/_/js/k... https://www.youtube.com/s/_/ytembeds/_/js/k=ytembeds.base.en_US.5f0apfZzpOA.2021.O/am=AAAABA/d=1/br=1/rs=AGKMywFg3MG1UeKh8ePjbhY_YEMv-NHjmA/m=root,base — 200 — 140.1 KiB — 509 ms — h2https://www.youtube.com/s/player/1bb6ee63/player_embed_es6.vflset/en_US/base.jswww.youtube.com/s/player/1bb6ee63/p... https://www.youtube.com/s/player/1bb6ee63/player_embed_es6.vflset/en_US/base.js — 200 — 436.0 KiB — 647 ms — h2https://digitalfeedback.euro.confirmit.com/api/digitalfeedback/static/v32/intercept-survey.jsdigitalfeedback.euro.confirmit.com/... https://digitalfeedback.euro.confirmit.com/api/digitalfeedback/static/v32/intercept-survey.js — 200 — 16.2 KiB — 8 ms — h2https://lantern.roeyecdn.com/lantern_global_25134.min.jslantern.roeyecdn.com/lantern_global... https://lantern.roeyecdn.com/lantern_global_25134.min.js — 200 — 2.1 KiB — 15 ms — h2https://edge.eu1.fullstory.com/s/settings/o-A5GK-eu1/v1/webedge.eu1.fullstory.com/s/settings/o... https://edge.eu1.fullstory.com/s/settings/o-A5GK-eu1/v1/web — 200 — 2.3 KiB — 10 ms — h2https://digitalfeedback.euro.confirmit.com/api/digitalfeedback/loader/prod/program?programKey=qCwM78&programVersion=22digitalfeedback.euro.confirmit.com/... https://digitalfeedback.euro.confirmit.com/api/digitalfeedback/loader/prod/program?programKey=qCwM78&programVersion=22 — 200 — 838 B — 17 ms — h2https://rs.eu1.fullstory.com/rec/pagers.eu1.fullstory.com/rec/page https://rs.eu1.fullstory.com/rec/page — 200 — 885 B — 292 ms — h2https://digitalfeedback.euro.confirmit.com/api/digitalfeedback/loader/prod/scenario?programKey=qCwM78&scenarioId=11952&programVersion=22digitalfeedback.euro.confirmit.com/... https://digitalfeedback.euro.confirmit.com/api/digitalfeedback/loader/prod/scenario?programKey=qCwM78&scenarioId=11952&programVersion=22 — 200 — 4.3 KiB — 7 ms — h2https://digitalfeedback.euro.confirmit.com/api/digitalfeedback/loader/prod/scenario?programKey=qCwM78&scenarioId=11954&programVersion=22digitalfeedback.euro.confirmit.com/... https://digitalfeedback.euro.confirmit.com/api/digitalfeedback/loader/prod/scenario?programKey=qCwM78&scenarioId=11954&programVersion=22 — 200 — 1.1 KiB — 9 ms — h2https://rs.eu1.fullstory.com/rec/integrations?OrgId=o-A5GK-eu1&isInFrame=false&isNative=falsers.eu1.fullstory.com/rec/integratio... https://rs.eu1.fullstory.com/rec/integrations?OrgId=o-A5GK-eu1&isInFrame=false&isNative=false — 200 — 4.0 KiB — 220 ms — h2https://www.google.com/recaptcha/api2/bframe?hl=en&v=gTpTIWhbKpxADzTzkcabhXN4&k=6Lc_MaEsAAAAAGMWkRwMDbHv32fB093SaoTuie-8&bft=0dAFcWeA68rbvIlbKOwB_Y5cpOoLJrx8gxeO4TG_KawxNFB2Ysr_4ir3z9SyAbdxhUbPKVjtPiBat4mpTOETGuxsg-3SCcz02n-Awww.google.com/recaptcha/api2/bfram... https://www.google.com/recaptcha/api2/bframe?hl=en&v=gTpTIWhbKpxADzTzkcabhXN4&k=6Lc_MaEsAAAAAGMWkRwMDbHv32fB093SaoTuie-8&bft=0dAFcWeA68rbvIlbKOwB_Y5cpOoLJrx8gxeO4TG_KawxNFB2Ysr_4ir3z9SyAbdxhUbPKVjtPiBat4mpTOETGuxsg-3SCcz02n-A — 200 — 2.2 KiB — 86 ms — h3https://edge.eu1.fullstory.com/datalayer/v4/latest.jsedge.eu1.fullstory.com/datalayer/v4... https://edge.eu1.fullstory.com/datalayer/v4/latest.js — 200 — 13.5 KiB — 70 ms — h3https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/styles__ltr.csswww.gstatic.com/recaptcha/releases/... https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/styles__ltr.css — 200 — 0 B — 0 ms — h2https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.jswww.gstatic.com/recaptcha/releases/... https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js — 200 — 0 B — 0 ms — h2https://googleads.g.doubleclick.net/pagead/idgoogleads.g.doubleclick.net/pagead/... https://googleads.g.doubleclick.net/pagead/id — 302 — 23 B — 127 ms — h3https://static.doubleclick.net/instream/ad_status.jsstatic.doubleclick.net/instream/ad_... https://static.doubleclick.net/instream/ad_status.js — 200 — 494 B — 71 ms — h2https://www.youtube.com/s/_/ytembeds/_/js/k=ytembeds.base.en_US.5f0apfZzpOA.2021.O/am=AAAABA/d=1/exm=base,root/ed=1/br=1/rs=AGKMywFg3MG1UeKh8ePjbhY_YEMv-NHjmA/m=r78Drbwww.youtube.com/s/_/ytembeds/_/js/k... https://www.youtube.com/s/_/ytembeds/_/js/k=ytembeds.base.en_US.5f0apfZzpOA.2021.O/am=AAAABA/d=1/exm=base,root/ed=1/br=1/rs=AGKMywFg3MG1UeKh8ePjbhY_YEMv-NHjmA/m=r78Drb — 200 — 183.1 KiB — 647 ms — h3https://googleads.g.doubleclick.net/pagead/id?slf_rd=1googleads.g.doubleclick.net/pagead/... https://googleads.g.doubleclick.net/pagead/id?slf_rd=1 — 200 — 146 B — 82 ms — h3https://www.google.com/js/th/rOmrN60AN-U9GRTHX8orPjMEIJ8wTXyJ5HZew_AwfbI.jswww.google.com/js/th/rOmrN60AN-U9GR... https://www.google.com/js/th/rOmrN60AN-U9GRTHX8orPjMEIJ8wTXyJ5HZew_AwfbI.js — 200 — 23.1 KiB — 6 ms — h3https://www.youtube.com/generate_204?cCJqtwwww.youtube.com/generate_204?cCJqtw https://www.youtube.com/generate_204?cCJqtw — 204 — 10 B — 177 ms — h3https://i.ytimg.com/vi_webp/_WQVgUYQS9g/sddefault.webpi.ytimg.com/vi_webp/_WQVgUYQS9g/sdd... https://i.ytimg.com/vi_webp/_WQVgUYQS9g/sddefault.webp — 200 — 42.0 KiB — 461 ms — h2https://jnn-pa.googleapis.com/$rpc/google.internal.waa.v1.Waa/GenerateITjnn-pa.googleapis.com/$rpc/google.i... https://jnn-pa.googleapis.com/$rpc/google.internal.waa.v1.Waa/GenerateIT — 200 — 0 B — 116 ms — h2https://jnn-pa.googleapis.com/$rpc/google.internal.waa.v1.Waa/GenerateITjnn-pa.googleapis.com/$rpc/google.i... https://jnn-pa.googleapis.com/$rpc/google.internal.waa.v1.Waa/GenerateIT — 200 — 312 B — 58 ms — h2https://www.bsigroup.com/favicon.icowww.bsigroup.com/favicon.ico https://www.bsigroup.com/favicon.ico — 200 — 9.9 KiB — 71 ms — h2https://rs.eu1.fullstory.com/rec/bundle/v2?OrgId=o-A5GK-eu1&UserId=2523d3c9-f45c-45ee-91fe-10994744db89&SessionId=80255f79-27df-420a-b81f-33407d542090&PageId=4becfb93-0bb1-4f6b-9be3-301f99a97261&Seq=1&ClientTime=1776888070744&CompiledVersion=faf4a07720b530a209f314b14847bb87c79a1846&PageStart=1776888068094&PrevBundleTime=0&LastActivity=2297&IsNewSession=true&ContentEncoding=gziprs.eu1.fullstory.com/rec/bundle/v2?... https://rs.eu1.fullstory.com/rec/bundle/v2?OrgId=o-A5GK-eu1&UserId=2523d3c9-f45c-45ee-91fe-10994744db89&SessionId=80255f79-27df-420a-b81f-33407d542090&PageId=4becfb93-0bb1-4f6b-9be3-301f99a97261&Seq=1&ClientTime=1776888070744&CompiledVersion=faf4a07720b530a209f314b14847bb87c79a1846&PageStart=1776888068094&PrevBundleTime=0&LastActivity=2297&IsNewSession=true&ContentEncoding=gzip — 200 — 44 B — 373 ms — h3https://www.youtube.com/youtubei/v1/log_event?alt=jsonwww.youtube.com/youtubei/v1/log_eve... https://www.youtube.com/youtubei/v1/log_event?alt=json — 200 — 50 B — 190 ms — h3
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 7782ms · 663KB · £134/mo
www.gstatic.com
Other
Costly
Execution 1239ms
Transfer 0 KB
Unused 49%
Monthly Cost £21/mo
www.bsigroup.com
Other
Costly
Execution 1162ms
Transfer 44 KB
Unused 56%
Monthly Cost £20/mo
edge.eu1.fullstory.com
Other
Costly
Execution 1116ms
Transfer 80 KB
Unused 34%
Monthly Cost £19/mo
Unattributable
Other
Costly
Execution 1084ms
Transfer 0 KB
Monthly Cost £19/mo
www.bsigroup.com
Other
Costly
Execution 1073ms
Transfer 40 KB
Monthly Cost £19/mo
Google Tag Manager
Tag Manager
Costly
Execution 751ms
Transfer 187 KB
Unused 32%
Monthly Cost £13/mo
OneTrust
Consent
Essential
Execution 519ms
Transfer 124 KB
Unused 52%
Monthly Cost £9/mo
Optimizely
A/B Testing
Costly
Execution 406ms
Transfer 99 KB
Unused 49%
Monthly Cost £7/mo
www.dwin1.com
Other
Optional
Execution 102ms
Transfer 16 KB
Monthly Cost £2/mo
Twitter/X Pixel
Advertising
Optional
Execution 89ms
Transfer 13 KB
Monthly Cost £2/mo
OneTrust
Consent
Essential
Execution 75ms
Transfer 5 KB
Monthly Cost £1/mo
www.bsigroup.com
Other
Optional
Execution 59ms
Transfer 31 KB
Unused 75%
Monthly Cost £1/mo
edge.eu1.fullstory.com
Other
Optional
Execution 58ms
Transfer 14 KB
Monthly Cost £1/mo
OneTrust
Consent
Essential
Execution 50ms
Transfer 10 KB
Monthly Cost £1/mo

These scripts may cost more than they're worth

  • www.gstatic.com adds 1239ms and costs ~£21/month
  • www.bsigroup.com adds 1162ms and costs ~£20/month
  • edge.eu1.fullstory.com adds 1116ms and costs ~£19/month
  • Unattributable adds 1084ms and costs ~£19/month
  • www.bsigroup.com adds 1073ms and costs ~£19/month
  • Google Tag Manager adds 751ms and costs ~£13/month
  • Optimizely adds 406ms and costs ~£7/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.gstatic.com takes 1239ms 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.bsigroup.com takes 1162ms 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

56% of www.bsigroup.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

edge.eu1.fullstory.com takes 1116ms 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 1084ms 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.bsigroup.com takes 1073ms 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 751ms 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 OneTrust'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

Optimizely takes 406ms 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

75% of www.bsigroup.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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