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https://bsigroup.com

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
69
GRADE
D
FIX
5
REVIEW
3
PASS
5
INFO
2

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

Mobile Desktop
75
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.

1.79 s

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

1.95 s

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

136 ms

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

0.009

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

2.98 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.

3.96 s

Page Load Progression

415 ms
829 ms
1.2 s
1.7 s
2.1 s
2.5 s
2.9 s
3.3 s
Checks
15
5 PASS 3 REVIEW 5 FIX
F
Page Weight Budget
Action
4.2 MB transferred, 127 requests
FIX
4.2 MB transferred, 127 requests
Critical::
Page weighs 15.1 MB (4.2 MB transferred)
Warning::
JavaScript is 3.1 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 3.1 MB
Warning::
127 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.89 g CO2 per page load
4.2 MB / 2.4 MB budget
4.2 MB transferred
127 requests
0.89 g CO2 per page load
JavaScript 3.1 MiB 72%
Images 596.9 KiB 14%
CSS 193.5 KiB 4%
HTML 179.0 KiB 4%
Fonts 158.2 KiB 4%
Other 73.1 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 (4.2 MiB of 4.2 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Bundles
Action
57 scripts, 955 KB unused
FIX
57 scripts, 955 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: 955 KB
955 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 KB28 KB (35%)✓3rd
https://www.bsigroup.com/build/assets/swiper-bundle-r8-hi7mH.js44 KB25 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
127 resources · 4.2 MB · 955 KB savings available
FIX
127 resources · 4.2 MB · 955 KB savings available
Warning::
Page weight 3.2 MB over 1MB target
Got: 4.2 MB Expected: ≤ 1 MB
Info::
~955 KB of savings available
Warning::
126 third-party resources (100% of weight)
Info::
5 resources over 200KB
127 resources · 4.2 MiB · 126 third-party 3.2 MiB over 1MB target
JavaScript 72% · 3.1 MiB
Image 14% · 607.6 KiB
CSS 5% · 198.1 KiB
Document 4% · 179.0 KiB
Font 4% · 158.2 KiB
Other 2% · 75.5 KiB

~954.7 KiB of savings available

Remove unused JavaScript: 954.7 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
25 images, 0 KB saveable
REVIEW
25 images, 0 KB saveable
Info::
All images are well-optimized
25 images 597 KB
0 oversized -0 KB
14 legacy format
0 missing dimensions CLS risk
C
JS Execution Cost
Action
1884ms total JS execution
REVIEW
1884ms total JS execution
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 302ms CPU time
Warning::
https://www.bsigroup.com/: 295ms CPU time
Warning::
Unattributable: 265ms CPU time
Warning::
https://www.bsigroup.com/build/assets/swiper-bundl...: 263ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-WX5...: 257ms CPU time
Warning::
Third-party scripts: 1884ms (100% of total)

Main Thread Breakdown

Script Evaluation 56% Other 22% Style & Layout 11% Script Parsing & Compilation 6%
ScriptTotalScriptingParse/CompileParty
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js302ms249ms39ms3rd
https://www.bsigroup.com/295ms28ms8ms3rd
Unattributable265ms13ms0ms3rd
https://www.bsigroup.com/build/assets/swiper-bundle-r8-hi7mH.js263ms82ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WX52CM257ms211ms24ms3rd
https://edge.eu1.fullstory.com/s/fs.js246ms218ms11ms3rd
https://cdn.cookielaw.org/scripttemplates/202510.2.0/otBannerSdk.js156ms118ms17ms3rd
https://cdn.optimizely.com/js/24631140947.js100ms79ms11ms3rd
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
5 fonts (158 KB)
PASS
5 fonts (158 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

158 KB total

Render-blocking

0

of 5

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.8 s LCP 1.9 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 — 17 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 — 24 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 73 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 — 22 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBA.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBA.woff2 — 39.2 KiB — 21 ms — font-display: swap
o-0bIpQlx3QUlC5A4PNB6Ry... woff2 swap
Size 35 KB
Load time 17 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
ga6daw1J5X9T9RW6j9bNVls... woff2 swap
Size 36 KB
Load time 24 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 34 KB
Load time 73 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
o-0bIpQlx3QUlC5A4PNB6Ry... woff2 swap
Size 14 KB
Load time 22 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 39 KB
Load time 21 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
127 requests over 5527ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 1.8 s LCP 1.9 shttps://bsigroup.com// https://bsigroup.com/ — 301 — 202 B — 814 ms — http/1.1https://www.bsigroup.com/www.bsigroup.com/ https://www.bsigroup.com/ — 200 — 39.5 KiB — 56 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 — 28 ms — h2https://cdn.optimizely.com/js/24631140947.jscdn.optimizely.com/js/24631140947.j... https://cdn.optimizely.com/js/24631140947.js — 200 — 99.2 KiB — 43 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 — 5.8 KiB — 47 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 — 9.2 KiB — 51 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 — 129 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 — 28 ms — h2https://www.google.com/recaptcha/api.jswww.google.com/recaptcha/api.js https://www.google.com/recaptcha/api.js — 200 — 1012 B — 133 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=1440www.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=1440 — 200 — 169.8 KiB — 28 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 — 22 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 — 30 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 — 40 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 — 1.4 KiB — 94 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 — 279 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 — 274 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 — 13 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 — 15 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 — 1.2 KiB — 16 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 — 357 ms — h2https://page.bsigroup.com/pdt.jspage.bsigroup.com/pdt.js https://page.bsigroup.com/pdt.js — 200 — 4.4 KiB — 545 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 — 106 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 — 545 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 — 51 ms — h2https://www.youtube.com/embed/_WQVgUYQS9g?si=-8xCzCYqnoKXSaVpwww.youtube.com/embed/_WQVgUYQS9g?s... https://www.youtube.com/embed/_WQVgUYQS9g?si=-8xCzCYqnoKXSaVp — 200 — 56.3 KiB — 365 ms — h2https://geolocation.onetrust.com/cookieconsentpub/v1/geo/locationgeolocation.onetrust.com/cookiecons... https://geolocation.onetrust.com/cookieconsentpub/v1/geo/location — 200 — 286 B — 66 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 — 27 ms — h2https://www.bsigroup.com/Areas/v1/UI/images/icons/icon-expand-more.svgwww.bsigroup.com/Areas/v1/UI/images... https://www.bsigroup.com/Areas/v1/UI/images/icons/icon-expand-more.svg — 200 — 678 B — 28 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 — 28 ms — h2
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 1.8 s LCP 1.9 shttps://bsigroup.com// https://bsigroup.com/ — 301 — 202 B — 814 ms — http/1.1https://www.bsigroup.com/www.bsigroup.com/ https://www.bsigroup.com/ — 200 — 39.5 KiB — 56 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 — 28 ms — h2https://cdn.optimizely.com/js/24631140947.jscdn.optimizely.com/js/24631140947.j... https://cdn.optimizely.com/js/24631140947.js — 200 — 99.2 KiB — 43 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 — 5.8 KiB — 47 ms — h2https://cdn.cookielaw.org/consent/90e9269f-721c-47d4-8fbd-c5da21075dc6/otSDKStub.jscdn.cookielaw.org/consent/90e9269f-... 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https://t.co/i/adsct?bci=3&dv=UTC%26en-US%2Cen%26Google%20Inc.%26Linux%20x86_64%26255%26800%26600%264%2624%26800%26600%260%26na&eci=2&event_id=3ad74f4e-a13c-4039-aa2c-82c94ca70dc7&events=%5B%5B%22pageview%22%2C%7B%7D%5D%5D&integration=advertiser&p_id=Twitter&p_user_id=0&pl_id=d361640e-6413-469c-8415-eb4fdffa08c6&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.1776888089595.58128996427391360&txn_id=o3umf&type=javascript&version=2.3.53 — -1 — 0 B — 2 ms — https://googleads.g.doubleclick.net/pagead/idgoogleads.g.doubleclick.net/pagead/... https://googleads.g.doubleclick.net/pagead/id — -1 — 0 B — 188 ms — https://static.doubleclick.net/instream/ad_status.jsstatic.doubleclick.net/instream/ad_... https://static.doubleclick.net/instream/ad_status.js — -1 — 0 B — 177 ms — 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=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 — -1 — 0 B — 167 ms — https://www.dwin1.com/25134.jswww.dwin1.com/25134.js https://www.dwin1.com/25134.js — 200 — 16.2 KiB — 40 ms — h2https://edge.eu1.fullstory.com/s/fs.jsedge.eu1.fullstory.com/s/fs.js https://edge.eu1.fullstory.com/s/fs.js — 200 — 79.8 KiB — 31 ms — 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https://cdn.cookielaw.org/scripttemplates/202510.2.0/assets/otCookieSettingsButton.json — 200 — 1.9 KiB — 24 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 — 24 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 — 0 B — 0 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 — 0 B — 0 ms — 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https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js — 200 — 0 B — 79 ms — h2https://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 — 518 B — 12 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 — 13 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 — 15 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 — 854 B — 19 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 — 26 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 — 12 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 — 17 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 — 12 ms — h2https://rs.eu1.fullstory.com/rec/pagers.eu1.fullstory.com/rec/page https://rs.eu1.fullstory.com/rec/page — 200 — 882 B — 319 ms — h2https://googleads.g.doubleclick.net/pagead/idgoogleads.g.doubleclick.net/pagead/... https://googleads.g.doubleclick.net/pagead/id — 302 — 23 B — 119 ms — h3https://static.doubleclick.net/instream/ad_status.jsstatic.doubleclick.net/instream/ad_... https://static.doubleclick.net/instream/ad_status.js — 200 — 0 B — 6 ms — h2https://www.youtube.com/s/_/ytembeds/_/js/k=ytembeds.base.en_US.-RE1iC8VNhI.es5.O/am=AAAABA/d=1/exm=base,root/ed=1/br=1/rs=AGKMywGXhZZuMuO0YRo6SSj6JkWgSrzy9g/m=r78Drbwww.youtube.com/s/_/ytembeds/_/js/k... https://www.youtube.com/s/_/ytembeds/_/js/k=ytembeds.base.en_US.-RE1iC8VNhI.es5.O/am=AAAABA/d=1/exm=base,root/ed=1/br=1/rs=AGKMywGXhZZuMuO0YRo6SSj6JkWgSrzy9g/m=r78Drb — 200 — 202.7 KiB — 22 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 — 69 ms — h3https://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 — 234 ms — h2https://i.ytimg.com/vi_webp/_WQVgUYQS9g/maxresdefault.webpi.ytimg.com/vi_webp/_WQVgUYQS9g/max... https://i.ytimg.com/vi_webp/_WQVgUYQS9g/maxresdefault.webp — 200 — 101.8 KiB — 138 ms — h2https://www.gstatic.com/youtube/img/icons/mweb/youtube_fill/logo/v2/67px.svgwww.gstatic.com/youtube/img/icons/m... https://www.gstatic.com/youtube/img/icons/mweb/youtube_fill/logo/v2/67px.svg — 200 — 298 B — 71 ms — h3https://www.google.com/recaptcha/api2/bframe?hl=en&v=gTpTIWhbKpxADzTzkcabhXN4&k=6Lc_MaEsAAAAAGMWkRwMDbHv32fB093SaoTuie-8&bft=0dAFcWeA70xJWmC4Uzt4IeCLZQh4rYoEoASyrEXLrXtvrQzMkarwh7_vGebWbYoEMkoN5JvsPLN-dP59cIYjpQ67FtchvEGQGCtwwww.google.com/recaptcha/api2/bfram... https://www.google.com/recaptcha/api2/bframe?hl=en&v=gTpTIWhbKpxADzTzkcabhXN4&k=6Lc_MaEsAAAAAGMWkRwMDbHv32fB093SaoTuie-8&bft=0dAFcWeA70xJWmC4Uzt4IeCLZQh4rYoEoASyrEXLrXtvrQzMkarwh7_vGebWbYoEMkoN5JvsPLN-dP59cIYjpQ67FtchvEGQGCtw — 200 — 2.2 KiB — 64 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 — 7 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 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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 — 64 ms — h2https://rs.eu1.fullstory.com/rec/bundle/v2?OrgId=o-A5GK-eu1&UserId=c6a1dcf7-6445-4829-a7fe-191a92735d75&SessionId=a5b45cc9-752f-40b0-af6c-67cd7a0149c6&PageId=cf0fd0fb-64fb-4141-a8ea-34a6e2adad84&Seq=1&ClientTime=1776888093291&CompiledVersion=faf4a07720b530a209f314b14847bb87c79a1846&PageStart=1776888090590&PrevBundleTime=0&LastActivity=2327&IsNewSession=true&ContentEncoding=gziprs.eu1.fullstory.com/rec/bundle/v2?... https://rs.eu1.fullstory.com/rec/bundle/v2?OrgId=o-A5GK-eu1&UserId=c6a1dcf7-6445-4829-a7fe-191a92735d75&SessionId=a5b45cc9-752f-40b0-af6c-67cd7a0149c6&PageId=cf0fd0fb-64fb-4141-a8ea-34a6e2adad84&Seq=1&ClientTime=1776888093291&CompiledVersion=faf4a07720b530a209f314b14847bb87c79a1846&PageStart=1776888090590&PrevBundleTime=0&LastActivity=2327&IsNewSession=true&ContentEncoding=gzip — -1 — 0 B — 0 ms — https://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 — 64 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 1884ms · 574KB · £33/mo
www.gstatic.com
Other
Costly
Execution 302ms
Transfer 0 KB
Unused 49%
Monthly Cost £5/mo
www.bsigroup.com
Other
Costly
Execution 295ms
Transfer 40 KB
Monthly Cost £5/mo
Unattributable
Other
Costly
Execution 265ms
Transfer 0 KB
Monthly Cost £5/mo
www.bsigroup.com
Other
Costly
Execution 263ms
Transfer 44 KB
Unused 56%
Monthly Cost £5/mo
Google Tag Manager
Tag Manager
Costly
Execution 257ms
Transfer 187 KB
Unused 32%
Monthly Cost £4/mo
edge.eu1.fullstory.com
Other
Costly
Execution 246ms
Transfer 80 KB
Unused 35%
Monthly Cost £4/mo
OneTrust
Consent
Essential
Execution 156ms
Transfer 124 KB
Unused 52%
Monthly Cost £3/mo
Optimizely
A/B Testing
Optional
Execution 100ms
Transfer 99 KB
Unused 49%
Monthly Cost £2/mo

These scripts may cost more than they're worth

  • www.gstatic.com adds 302ms and costs ~£5/month
  • www.bsigroup.com adds 295ms and costs ~£5/month
  • Unattributable adds 265ms and costs ~£5/month
  • www.bsigroup.com adds 263ms and costs ~£5/month
  • Google Tag Manager adds 257ms and costs ~£4/month
  • edge.eu1.fullstory.com adds 246ms and costs ~£4/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 302ms 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 295ms 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 265ms 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 263ms 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

Google Tag Manager takes 257ms 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

edge.eu1.fullstory.com takes 246ms 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

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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