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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
70
GRADE
C
FIX
6
REVIEW
2
PASS
7
INFO
2

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

Mobile Desktop
45
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.
77
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

1.81 s

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

7.83 s

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

878 ms

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

0.138

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

5.35 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.

19.85 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
7 PASS 2 REVIEW 6 FIX
F
Page Weight Budget
Action
3.2 MB transferred, 100 requests
FIX
3.2 MB transferred, 100 requests
Warning::
Page weighs 8.5 MB (3.2 MB transferred)
Warning::
JavaScript is 1.5 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.5 MB
Warning::
Images are 1.0 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.0 MB
Info::
100 HTTP requests
Info::
Estimated 0.68 g CO2 per page load
3.2 MB / 2.4 MB budget
3.2 MB transferred
100 requests
0.68 g CO2 per page load
JavaScript 1.5 MiB 46%
Images 1.0 MiB 32%
Other 273.6 KiB 8%
Fonts 189.7 KiB 6%
Other 97.0 KiB 3%
CSS 89.9 KiB 3%
Other 36.3 KiB 1%
HTML 30.6 KiB 1%
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

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

Why this matters

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

Source: web.dev

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 (3.2 MiB of 3.2 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
4776ms total JS execution
FIX
4776ms total JS execution
Warning::
https://www.bt.com/: 859ms CPU time
Warning::
https://www.bt.com/home/_next/static/chunks/pages/...: 745ms CPU time
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 666ms CPU time
Warning::
https://www.bt.com/home/_next/static/chunks/framew...: 628ms CPU time
Warning::
Unattributable: 580ms CPU time
Warning::
Third-party scripts: 4776ms (100% of total)

Main Thread Breakdown

Script Evaluation 56% Other 18% Style & Layout 11% Script Parsing & Compilation 8% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://www.bt.com/859ms104ms1ms3rd
https://www.bt.com/home/_next/static/chunks/pages/_app-c46a38d10daabda4.js745ms508ms124ms3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js666ms578ms69ms3rd
https://www.bt.com/home/_next/static/chunks/framework-050c1f32293f7182.js628ms450ms14ms3rd
Unattributable580ms19ms0ms3rd
https://js-cdn.dynatrace.com/jstag/17f0bd28e42/bf88365yqv/95b067d34295602_complete.js442ms317ms32ms3rd
https://assets.adobedtm.com/launch-ENfdadf1bb09d848de85923e05be32e7d1.min.js238ms178ms51ms3rd
https://www.googletagmanager.com/gtag/js?id=G-19536D3EL2224ms180ms42ms3rd
https://www.bt.com/home/_next/static/chunks/main-703d0df2c17dec2d.js80ms71ms9ms3rd
https://cdn-ukwest.onetrust.com/consent/93aec36f-64c3-487b-897d-5e8f88cbe7b9/otSDKStub.js77ms72ms2ms3rd

Showing top 10 of 14 scripts

F
JS Bundles
Action
37 scripts, 790 KB unused
FIX
37 scripts, 790 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.googletagmanager.com/gtag/js?id=G-1953...: 77 KB unused (44%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://assets.adobedtm.com/launch-ENfdadf1bb09d84...: 65 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 790 KB
790 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.js362 KB177 KB (49%)✓3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js362 KB177 KB (49%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-19536D3EL2177 KB77 KB (44%)✓3rd
https://assets.adobedtm.com/launch-ENfdadf1bb09d848de85923e05be32e7d1.min.js134 KB65 KB (49%)✓3rd
https://cdn-ukwest.onetrust.com/scripttemplates/202501.2.0/otBannerSdk.js115 KB61 KB (53%)✓3rd
https://js-cdn.dynatrace.com/jstag/17f0bd28e42/bf88365yqv/95b067d34295602_complete.js85 KB34 KB (40%)✓3rd
https://www.bt.com/home/_next/static/chunks/framework-050c1f32293f7182.js59 KB23 KB (38%)✓3rd
https://code.jquery.com/jquery-3.7.1.min.js30 KB—✓3rd
https://www.bt.com/home/_next/static/chunks/627.55782f2aa7f83a77.js3 KB—✓3rd

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

F
Page Weight Inventory
Action
100 resources · 3.2 MB · 790 KB savings available
FIX
100 resources · 3.2 MB · 790 KB savings available
Warning::
Page weight 2.2 MB over 1MB target
Got: 3.2 MB Expected: ≤ 1 MB
Info::
~790 KB of savings available
Warning::
99 third-party resources (100% of weight)
Info::
3 resources over 200KB
100 resources · 3.2 MiB · 99 third-party 2.2 MiB over 1MB target
JavaScript 56% · 1.8 MiB
Image 33% · 1.1 MiB
Font 6% · 189.7 KiB
CSS 3% · 94.2 KiB
Document 1% · 40.7 KiB
Other 1% · 32.8 KiB

~790.4 KiB of savings available

Remove unused JavaScript: 790.4 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
32 images, 0 KB saveable
REVIEW
32 images, 0 KB saveable
Warning::
https://www.bt.com/content/dam/bt/global/logos/BTl... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
32 images 1.0 MB
0 oversized -0 KB
8 legacy format
1 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

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
11 fonts (190 KB)
PASS
11 fonts (190 KB)
Info::
11 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

11

190 KB total

Render-blocking

0

of 11

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 7.0 s 8.0 s FCP 1.8 s LCP 7.8 shttps://www.bt.com/home/_next/static/media/BTCurve_W_Rg.d1585de4.woff2BTCurve_W_Rg.d1585de4.w... https://www.bt.com/home/_next/static/media/BTCurve_W_Rg.d1585de4.woff2 — 20.1 KiB — 59 ms — font-display: swaphttps://www.bt.com/home/_next/static/media/BTCurve_W_Headline.dfb8c48d.woff2BTCurve_W_Headline.dfb8... https://www.bt.com/home/_next/static/media/BTCurve_W_Headline.dfb8c48d.woff2 — 20.6 KiB — 60 ms — font-display: swaphttps://www.bt.com/home/_next/static/media/Dottee-Condensed-Regular.dfe2f558.woff2Dottee-Condensed-Regula... https://www.bt.com/home/_next/static/media/Dottee-Condensed-Regular.dfe2f558.woff2 — 16.3 KiB — 128 ms — font-display: swaphttps://www.bt.com/home/_next/static/media/Non-Dottee-Regular.32dec766.woff2Non-Dottee-Regular.32de... https://www.bt.com/home/_next/static/media/Non-Dottee-Regular.32dec766.woff2 — 28.1 KiB — 161 ms — font-display: swaphttps://www.bt.com/home/_next/static/media/BTCurve_W_Bd.50264748.woff2BTCurve_W_Bd.50264748.w... https://www.bt.com/home/_next/static/media/BTCurve_W_Bd.50264748.woff2 — 20.7 KiB — 119 ms — font-display: swapdata:application/font-woff;charset=utf-8;base64, d09GRgABAAAAAAZgABAAAAAADAAAAAAAAAAAAAAAAAAAAAAAAA…font-woff;charset=utf-8... data:application/font-woff;charset=utf-8;base64, d09GRgABAAAAAAZgABAAAAAADAAAAAAAAAAAAAAAAAAAAAAAAA… — 1.6 KiB — 60 ms — font-display: swaphttps://www.bt.com/etc.clientlibs/global/clientlibs/resources/fonts2/BTFont_W_Rg.woffBTFont_W_Rg.woff https://www.bt.com/etc.clientlibs/global/clientlibs/resources/fonts2/BTFont_W_Rg.woff — 36.1 KiB — 8 ms — font-display: swaphttps://www.bt.com/etc.clientlibs/global/clientlibs/resources/fonts/bt-icons.woffbt-icons.woff https://www.bt.com/etc.clientlibs/global/clientlibs/resources/fonts/bt-icons.woff — 3.5 KiB — 12 ms — font-display: swaphttps://www.bt.com/exp/home/_next/static/media/BTCurve_W_Rg.d1585de4.woff2BTCurve_W_Rg.d1585de4.w... https://www.bt.com/exp/home/_next/static/media/BTCurve_W_Rg.d1585de4.woff2 — 448 B — 343 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 85 ms — font-display: swaphttps://www.bt.com/etc.clientlibs/global/clientlibs/resources/fonts/bttvicons.woffbttvicons.woff https://www.bt.com/etc.clientlibs/global/clientlibs/resources/fonts/bttvicons.woff — 8.3 KiB — 5 ms — font-display: swap
BTCurve_W_Rg.d1585de4.w... woff2 swap
Size 20 KB
Load time 59 ms
Start 149 ms
Risk FOUT — text flashes from fallback to web font
BTCurve_W_Headline.dfb8... woff2 swap
Size 21 KB
Load time 60 ms
Start 367 ms
Risk FOUT — text flashes from fallback to web font
Dottee-Condensed-Regula... woff2 swap
Size 16 KB
Load time 128 ms
Start 368 ms
Risk FOUT — text flashes from fallback to web font
Non-Dottee-Regular.32de... woff2 swap
Size 28 KB
Load time 161 ms
Start 368 ms
Risk FOUT — text flashes from fallback to web font
BTCurve_W_Bd.50264748.w... woff2 swap
Size 21 KB
Load time 119 ms
Start 368 ms
Risk FOUT — text flashes from fallback to web font
font-woff;charset=utf-8... woff swap
Size 2 KB
Load time 60 ms
Start 411 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
BTFont_W_Rg.woff woff swap
Size 36 KB
Load time 8 ms
Start 927 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
bt-icons.woff woff swap
Size 4 KB
Load time 12 ms
Start 927 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
BTCurve_W_Rg.d1585de4.w... woff2 swap
Size 0 KB
Load time 343 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 34 KB
Load time 85 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
bttvicons.woff woff swap
Size 8 KB
Load time 5 ms
Start 1.3 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
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)

Fixing the unchecked items could save ~15 KB and ~30 ms

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
100 requests over 3374ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s FCP 1.8 s LCP 7.8 shttps://bt.com// https://bt.com/ — 301 — 37 B — 9 ms — h2https://www.bt.com/www.bt.com/ https://www.bt.com/ — 302 — 610 B — 11 ms — h2https://www.bt.com/www.bt.com/ https://www.bt.com/ — 200 — 3.0 KiB — 79 ms — h2https://js-cdn.dynatrace.com/jstag/17f0bd28e42/bf88365yqv/95b067d34295602_complete.jsjs-cdn.dynatrace.com/jstag/17f0bd28... https://js-cdn.dynatrace.com/jstag/17f0bd28e42/bf88365yqv/95b067d34295602_complete.js — 200 — 85.1 KiB — 116 ms — h2https://www.bt.com/home/_next/static/css/d7c01f3734e5ed92.csswww.bt.com/home/_next/static/css/d7... https://www.bt.com/home/_next/static/css/d7c01f3734e5ed92.css — 200 — 32.4 KiB — 12 ms — h2https://www.bt.com/home/_next/static/css/c3bffdf05cdd9662.csswww.bt.com/home/_next/static/css/c3... https://www.bt.com/home/_next/static/css/c3bffdf05cdd9662.css — 200 — 7.8 KiB — 11 ms — h2https://assets.adobedtm.com/launch-ENfdadf1bb09d848de85923e05be32e7d1.min.jsassets.adobedtm.com/launch-ENfdadf1... https://assets.adobedtm.com/launch-ENfdadf1bb09d848de85923e05be32e7d1.min.js — 200 — 134.2 KiB — 48 ms — h2https://www.bt.com/home/_next/static/chunks/webpack-4d73a06ae50914bd.jswww.bt.com/home/_next/static/chunks... https://www.bt.com/home/_next/static/chunks/webpack-4d73a06ae50914bd.js — 200 — 2.1 KiB — 10 ms — h2https://www.bt.com/home/_next/static/chunks/framework-050c1f32293f7182.jswww.bt.com/home/_next/static/chunks... https://www.bt.com/home/_next/static/chunks/framework-050c1f32293f7182.js — 200 — 59.2 KiB — 18 ms — h2https://www.bt.com/home/_next/static/chunks/main-703d0df2c17dec2d.jswww.bt.com/home/_next/static/chunks... https://www.bt.com/home/_next/static/chunks/main-703d0df2c17dec2d.js — 200 — 36.4 KiB — 16 ms — h2https://www.bt.com/home/_next/static/chunks/pages/_app-c46a38d10daabda4.jswww.bt.com/home/_next/static/chunks... https://www.bt.com/home/_next/static/chunks/pages/_app-c46a38d10daabda4.js — 200 — 12.9 KiB — 12 ms — h2https://www.bt.com/home/_next/static/chunks/360-c13d261713eb5fcc.jswww.bt.com/home/_next/static/chunks... https://www.bt.com/home/_next/static/chunks/360-c13d261713eb5fcc.js — 200 — 19.7 KiB — 10 ms — h2https://www.bt.com/home/_next/static/chunks/3-438b0bb789ecd2ca.jswww.bt.com/home/_next/static/chunks... https://www.bt.com/home/_next/static/chunks/3-438b0bb789ecd2ca.js — 200 — 49.1 KiB — 15 ms — h2https://www.bt.com/home/_next/static/chunks/690-42133ed584a8734e.jswww.bt.com/home/_next/static/chunks... https://www.bt.com/home/_next/static/chunks/690-42133ed584a8734e.js — 200 — 4.8 KiB — 10 ms — h2https://www.bt.com/home/_next/static/chunks/pages/index-bdd4a1f377a76969.jswww.bt.com/home/_next/static/chunks... https://www.bt.com/home/_next/static/chunks/pages/index-bdd4a1f377a76969.js — 200 — 9.4 KiB — 6 ms — h2https://www.bt.com/home/_next/static/Ts2DalLh5IbG21YXNzxnG/_buildManifest.jswww.bt.com/home/_next/static/Ts2Dal... https://www.bt.com/home/_next/static/Ts2DalLh5IbG21YXNzxnG/_buildManifest.js — 200 — 591 B — 6 ms — h2https://www.bt.com/home/_next/static/Ts2DalLh5IbG21YXNzxnG/_ssgManifest.jswww.bt.com/home/_next/static/Ts2Dal... https://www.bt.com/home/_next/static/Ts2DalLh5IbG21YXNzxnG/_ssgManifest.js — 200 — 204 B — 6 ms — h2https://www.bt.com/_Incapsula_Resource?SWJIYLWA=719d34d31c8e3a6e6fffd425f7e032f3&ns=1&cb=1393297194www.bt.com/_Incapsula_Resource?SWJI... https://www.bt.com/_Incapsula_Resource?SWJIYLWA=719d34d31c8e3a6e6fffd425f7e032f3&ns=1&cb=1393297194 — 200 — 19.8 KiB — 8 ms — h2https://www.bt.com/home/_next/static/media/BTCurve_W_Rg.d1585de4.woff2www.bt.com/home/_next/static/media/... https://www.bt.com/home/_next/static/media/BTCurve_W_Rg.d1585de4.woff2 — 200 — 20.1 KiB — 59 ms — 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h2https://img01.products.bt.co.uk/content/dam/bt/storefront/bt-home/newcust-uplift/images/hero-banners/ee-tv/2026/march/12.webpimg01.products.bt.co.uk/content/dam... https://img01.products.bt.co.uk/content/dam/bt/storefront/bt-home/newcust-uplift/images/hero-banners/ee-tv/2026/march/12.webp — 200 — 19.8 KiB — 36 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 — 362.4 KiB — 188 ms — h2https://img01.products.bt.co.uk/content/dam/bt/storefront/bt-home/extcust-uplift/images/addon-cards/EE-Sports.webpimg01.products.bt.co.uk/content/dam... https://img01.products.bt.co.uk/content/dam/bt/storefront/bt-home/extcust-uplift/images/addon-cards/EE-Sports.webp — 200 — 49.1 KiB — 34 ms — h2https://img01.products.bt.co.uk/content/dam/bt/storefront/bt-home/extcust-uplift/images/addon-cards/BT-Business.webpimg01.products.bt.co.uk/content/dam... https://img01.products.bt.co.uk/content/dam/bt/storefront/bt-home/extcust-uplift/images/addon-cards/BT-Business.webp — 200 — 21.3 KiB — 35 ms — h2https://img01.products.bt.co.uk/content/dam/bt/storefront/bt-home/extcust-uplift/images/addon-cards/EE-Gaming.webpimg01.products.bt.co.uk/content/dam... https://img01.products.bt.co.uk/content/dam/bt/storefront/bt-home/extcust-uplift/images/addon-cards/EE-Gaming.webp — 200 — 36.4 KiB — 36 ms — h2https://www.bt.com/etc.clientlibs/global/clientlibs.min.csswww.bt.com/etc.clientlibs/global/cl... https://www.bt.com/etc.clientlibs/global/clientlibs.min.css — 200 — 5.9 KiB — 21 ms — h2https://www.bt.com/content/dam/bt/global/js/btheader.api-1.0.jswww.bt.com/content/dam/bt/global/js... https://www.bt.com/content/dam/bt/global/js/btheader.api-1.0.js — 200 — 2.2 KiB — 27 ms — h2https://www.bt.com/content/dam/bt/global/js/btfooter.api-1.0.jswww.bt.com/content/dam/bt/global/js... https://www.bt.com/content/dam/bt/global/js/btfooter.api-1.0.js — 200 — 835 B — 29 ms — h2https://cdn-ukwest.onetrust.com/consent/93aec36f-64c3-487b-897d-5e8f88cbe7b9/93aec36f-64c3-487b-897d-5e8f88cbe7b9.jsoncdn-ukwest.onetrust.com/consent/93a... https://cdn-ukwest.onetrust.com/consent/93aec36f-64c3-487b-897d-5e8f88cbe7b9/93aec36f-64c3-487b-897d-5e8f88cbe7b9.json — 200 — 2.3 KiB — 95 ms — h2https://www.bt.com/content/bt/storefront/en/global/header.htmlwww.bt.com/content/bt/storefront/en... https://www.bt.com/content/bt/storefront/en/global/header.html — 200 — 6.8 KiB — 252 ms — h2https://www.bt.com/content/bt/storefront/en/global/footer.htmlwww.bt.com/content/bt/storefront/en... https://www.bt.com/content/bt/storefront/en/global/footer.html — 200 — 2.7 KiB — 191 ms — h2https://geolocation.onetrust.com/cookieconsentpub/v1/geo/locationgeolocation.onetrust.com/cookiecons... https://geolocation.onetrust.com/cookieconsentpub/v1/geo/location — 200 — 253 B — 70 ms — h2https://www.google.com/recaptcha/api2/anchor?ar=1&k=6LdIjzgqAAAAADgHjImBvaVYgxlS3I_BxlfOkOOy&co=aHR0cHM6Ly93d3cuYnQuY29tOjQ0Mw..&hl=en&v=gTpTIWhbKpxADzTzkcabhXN4&size=invisible&anchor-ms=20000&execute-ms=30000&cb=5u8w466a3rq4www.google.com/recaptcha/api2/ancho... https://www.google.com/recaptcha/api2/anchor?ar=1&k=6LdIjzgqAAAAADgHjImBvaVYgxlS3I_BxlfOkOOy&co=aHR0cHM6Ly93d3cuYnQuY29tOjQ0Mw..&hl=en&v=gTpTIWhbKpxADzTzkcabhXN4&size=invisible&anchor-ms=20000&execute-ms=30000&cb=5u8w466a3rq4 — 200 — 27.6 KiB — 77 ms — h3https://cdn-ukwest.onetrust.com/scripttemplates/202501.2.0/otBannerSdk.jscdn-ukwest.onetrust.com/scripttempl... https://cdn-ukwest.onetrust.com/scripttemplates/202501.2.0/otBannerSdk.js — 200 — 114.6 KiB — 58 ms — h2https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/styles__ltr.csswww.gstatic.com/recaptcha/releases/... https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/styles__ltr.css — 200 — 42.1 KiB — 96 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 — 361.9 KiB — 163 ms — h2https://cdn-ukwest.onetrust.com/consent/93aec36f-64c3-487b-897d-5e8f88cbe7b9/019299a1-489b-7eb0-abb9-06ef72f77e21/en.jsoncdn-ukwest.onetrust.com/consent/93a... https://cdn-ukwest.onetrust.com/consent/93aec36f-64c3-487b-897d-5e8f88cbe7b9/019299a1-489b-7eb0-abb9-06ef72f77e21/en.json — 200 — 59.6 KiB — 60 ms — h2https://www.bt.com/etc.clientlibs/global/clientlibs.min.jswww.bt.com/etc.clientlibs/global/cl... https://www.bt.com/etc.clientlibs/global/clientlibs.min.js — 200 — 258.2 KiB — 286 ms — h2https://www.bt.com/content/dam/bt/global/js/core.jswww.bt.com/content/dam/bt/global/js... https://www.bt.com/content/dam/bt/global/js/core.js — 200 — 3.4 KiB — 126 ms — h2https://www.bt.com/content/dam/bt/global/logos/footer-logo.svgwww.bt.com/content/dam/bt/global/lo... https://www.bt.com/content/dam/bt/global/logos/footer-logo.svg — 200 — 774 B — 4 ms — h2https://cdn-ukwest.onetrust.com/scripttemplates/202501.2.0/assets/otCenterRounded.jsoncdn-ukwest.onetrust.com/scripttempl... https://cdn-ukwest.onetrust.com/scripttemplates/202501.2.0/assets/otCenterRounded.json — 200 — 2.8 KiB — 40 ms — h2https://cdn-ukwest.onetrust.com/scripttemplates/202501.2.0/assets/v2/otPcCenter.jsoncdn-ukwest.onetrust.com/scripttempl... https://cdn-ukwest.onetrust.com/scripttemplates/202501.2.0/assets/v2/otPcCenter.json — 200 — 12.7 KiB — 39 ms — h2https://cdn-ukwest.onetrust.com/scripttemplates/202501.2.0/assets/otCommonStyles.csscdn-ukwest.onetrust.com/scripttempl... https://cdn-ukwest.onetrust.com/scripttemplates/202501.2.0/assets/otCommonStyles.css — 200 — 4.3 KiB — 48 ms — h2https://www.bt.com/etc.clientlibs/global/clientlibs/resources/fonts2/BTFont_W_Rg.woffwww.bt.com/etc.clientlibs/global/cl... https://www.bt.com/etc.clientlibs/global/clientlibs/resources/fonts2/BTFont_W_Rg.woff — 200 — 36.1 KiB — 8 ms — h2https://www.bt.com/etc.clientlibs/global/clientlibs/resources/fonts/bt-icons.woffwww.bt.com/etc.clientlibs/global/cl... https://www.bt.com/etc.clientlibs/global/clientlibs/resources/fonts/bt-icons.woff — 200 — 3.5 KiB — 12 ms — h2https://www.bt.com/content/dam/bt/global/logos/BTlogo_RGB_White.svgwww.bt.com/content/dam/bt/global/lo... https://www.bt.com/content/dam/bt/global/logos/BTlogo_RGB_White.svg — 200 — 639 B — 8 ms — h2https://cdn-ukwest.onetrust.com/logos/static/ot_guard_logo.svgcdn-ukwest.onetrust.com/logos/stati... https://cdn-ukwest.onetrust.com/logos/static/ot_guard_logo.svg — 200 — 513 B — 35 ms — h2https://cdn-ukwest.onetrust.com/logos/a0327856-31fc-4f51-b6d3-1c9e883e1ecf/6be977a3-7778-4e55-a1fd-7c1c8121d304/7664f13b-5af3-43c1-857b-84c8353262c9/BT_logo_2019.pngcdn-ukwest.onetrust.com/logos/a0327... https://cdn-ukwest.onetrust.com/logos/a0327856-31fc-4f51-b6d3-1c9e883e1ecf/6be977a3-7778-4e55-a1fd-7c1c8121d304/7664f13b-5af3-43c1-857b-84c8353262c9/BT_logo_2019.png — 200 — 77.9 KiB — 51 ms — h2https://cdn-ukwest.onetrust.com/logos/a0327856-31fc-4f51-b6d3-1c9e883e1ecf/6be977a3-7778-4e55-a1fd-7c1c8121d304/0591af59-2f09-440c-bc28-6ac0334a2b95/BT_Logo_Indigo_RGB_70X70.jpgcdn-ukwest.onetrust.com/logos/a0327... https://cdn-ukwest.onetrust.com/logos/a0327856-31fc-4f51-b6d3-1c9e883e1ecf/6be977a3-7778-4e55-a1fd-7c1c8121d304/0591af59-2f09-440c-bc28-6ac0334a2b95/BT_Logo_Indigo_RGB_70X70.jpg — 200 — 4.8 KiB — 43 ms — h2https://cdn-ukwest.onetrust.com/logos/static/powered_by_logo.svgcdn-ukwest.onetrust.com/logos/stati... https://cdn-ukwest.onetrust.com/logos/static/powered_by_logo.svg — 200 — 2.6 KiB — 41 ms — h2https://www.bt.com/exp/home/_next/static/media/BTCurve_W_Rg.d1585de4.woff2www.bt.com/exp/home/_next/static/me... https://www.bt.com/exp/home/_next/static/media/BTCurve_W_Rg.d1585de4.woff2 — 403 — 448 B — 343 ms — h2https://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 — 180 ms — h3https://www.gstatic.com/recaptcha/api2/logo_48.pngwww.gstatic.com/recaptcha/api2/logo... https://www.gstatic.com/recaptcha/api2/logo_48.png — 200 — 2.3 KiB — 27 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 — 85 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 — 10 ms — h2https://assets.adobedtm.com/468fd5a0b220/5e2a7b1f96d2/9b43926a1d72/RC1318737ea17348d5b7b34f5ae86441f7-source.min.jsassets.adobedtm.com/468fd5a0b220/5e... https://assets.adobedtm.com/468fd5a0b220/5e2a7b1f96d2/9b43926a1d72/RC1318737ea17348d5b7b34f5ae86441f7-source.min.js — 200 — 487 B — 5 ms — h2https://www.bt.com/etc.clientlibs/global/clientlibs/resources/fonts/bttvicons.woffwww.bt.com/etc.clientlibs/global/cl... https://www.bt.com/etc.clientlibs/global/clientlibs/resources/fonts/bttvicons.woff — 200 — 8.3 KiB — 5 ms — h2https://assets.adobedtm.com/468fd5a0b220/5e2a7b1f96d2/9b43926a1d72/RC31e920520b184dd1bbc4f4e454edd285-source.min.jsassets.adobedtm.com/468fd5a0b220/5e... https://assets.adobedtm.com/468fd5a0b220/5e2a7b1f96d2/9b43926a1d72/RC31e920520b184dd1bbc4f4e454edd285-source.min.js — 200 — 2.3 KiB — 3 ms — h2https://www.bt.com/exp/fep-common-assets/favicons/favicon.icowww.bt.com/exp/fep-common-assets/fa... https://www.bt.com/exp/fep-common-assets/favicons/favicon.ico — 200 — 35.7 KiB — 5 ms — h2https://bf88365yqv.bf.dynatrace.com/bf?type=js3&sn=v_4_srv_1_sn_ODVFUT1NDT9OAJSGK1Q3GK0VQQ6IUVKF_perc_100000_ol_0_mul_1_app-3A031b7bad6418e5d7_1_rcs-3Acss_0&svrid=1&flavor=cors&vi=UQOPJLFLDAACHSMVWFNMMSBKSFEUJNVA-0&modifiedSince=1776681976299&bp=3&app=095b067d34295602&crc=1437093732&en=9hu61abe&end=1bf88365yqv.bf.dynatrace.com/bf?type... https://bf88365yqv.bf.dynatrace.com/bf?type=js3&sn=v_4_srv_1_sn_ODVFUT1NDT9OAJSGK1Q3GK0VQQ6IUVKF_perc_100000_ol_0_mul_1_app-3A031b7bad6418e5d7_1_rcs-3Acss_0&svrid=1&flavor=cors&vi=UQOPJLFLDAACHSMVWFNMMSBKSFEUJNVA-0&modifiedSince=1776681976299&bp=3&app=095b067d34295602&crc=1437093732&en=9hu61abe&end=1 — 200 — 406 B — 109 ms — h2
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 4776ms · 708KB · £71/mo
www.bt.com
Other
Costly
Execution 859ms
Transfer 3 KB
Monthly Cost £13/mo
www.bt.com
Other
Costly
Execution 745ms
Transfer 13 KB
Monthly Cost £11/mo
www.gstatic.com
Other
Costly
Execution 666ms
Transfer 0 KB
Unused 49%
Monthly Cost £10/mo
www.bt.com
Other
Costly
Execution 628ms
Transfer 59 KB
Unused 38%
Monthly Cost £9/mo
Unattributable
Other
Costly
Execution 580ms
Transfer 0 KB
Monthly Cost £9/mo
js-cdn.dynatrace.com
Other
Costly
Execution 442ms
Transfer 85 KB
Unused 40%
Monthly Cost £7/mo
assets.adobedtm.com
Other
Costly
Execution 238ms
Transfer 134 KB
Unused 49%
Monthly Cost £4/mo
Google Tag Manager
Tag Manager
Costly
Execution 224ms
Transfer 177 KB
Unused 44%
Monthly Cost £3/mo
www.bt.com
Other
Optional
Execution 80ms
Transfer 36 KB
Monthly Cost £1/mo
cdn-ukwest.onetrust.com
Other
Optional
Execution 77ms
Transfer 8 KB
Monthly Cost £1/mo
cdn-ukwest.onetrust.com
Other
Optional
Execution 69ms
Transfer 115 KB
Unused 53%
Monthly Cost £1/mo
www.bt.com
Other
Optional
Execution 66ms
Transfer 9 KB
Monthly Cost £1/mo
www.bt.com
Other
Optional
Execution 53ms
Transfer 20 KB
Monthly Cost £1/mo
www.bt.com
Other
Optional
Execution 51ms
Transfer 49 KB
Monthly Cost £1/mo

These scripts may cost more than they're worth

  • www.bt.com adds 859ms and costs ~£13/month
  • www.bt.com adds 745ms and costs ~£11/month
  • www.gstatic.com adds 666ms and costs ~£10/month
  • www.bt.com adds 628ms and costs ~£9/month
  • Unattributable adds 580ms and costs ~£9/month
  • js-cdn.dynatrace.com adds 442ms and costs ~£7/month
  • assets.adobedtm.com adds 238ms and costs ~£4/month
  • Google Tag Manager adds 224ms 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.bt.com takes 859ms 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.bt.com takes 745ms 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.gstatic.com takes 666ms 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.bt.com takes 628ms 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 580ms 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

js-cdn.dynatrace.com takes 442ms 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

assets.adobedtm.com takes 238ms 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 224ms 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

53% of cdn-ukwest.onetrust.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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