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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
70
GRADE
C
FIX
5
REVIEW
3
PASS
5
INFO
2

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

Mobile Desktop
89
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.

525 ms

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

1.74 s

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

14 ms

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

0.089

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

1.69 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.

2.91 s

Page Load Progression

375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 s
Checks
15
5 PASS 3 REVIEW 5 FIX
F
Page Weight Budget
Action
3.1 MB transferred, 102 requests
FIX
3.1 MB transferred, 102 requests
Warning::
Page weighs 8.4 MB (3.1 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::
102 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.66 g CO2 per page load
3.1 MB / 2.4 MB budget
3.1 MB transferred
102 requests
0.66 g CO2 per page load
JavaScript 1.5 MiB 47%
Images 1000.6 KiB 31%
Other 274.0 KiB 8%
Fonts 181.5 KiB 6%
Other 96.7 KiB 3%
CSS 89.8 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

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 (3.1 MiB of 3.1 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Bundles
Action
37 scripts, 787 KB unused
FIX
37 scripts, 787 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: 787 KB
787 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 KB31 KB (36%)✓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
102 resources · 3.1 MB · 787 KB savings available
FIX
102 resources · 3.1 MB · 787 KB savings available
Warning::
Page weight 2.1 MB over 1MB target
Got: 3.1 MB Expected: ≤ 1 MB
Info::
~787 KB of savings available
Warning::
101 third-party resources (100% of weight)
Info::
3 resources over 200KB
102 resources · 3.1 MiB · 101 third-party 2.1 MiB over 1MB target
JavaScript 57% · 1.8 MiB
Image 32% · 1.0 MiB
Font 6% · 181.5 KiB
CSS 3% · 94.2 KiB
Document 1% · 40.5 KiB
Other 1% · 32.5 KiB

~787.3 KiB of savings available

Remove unused JavaScript: 787.3 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
35 images, 0 KB saveable
REVIEW
35 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.
35 images 1001 KB
0 oversized -0 KB
11 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
JS Execution Cost
Action
1144ms total JS execution
REVIEW
1144ms total JS execution
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 259ms CPU time
Info::
https://www.bt.com/: 209ms CPU time
Info::
https://www.bt.com/home/_next/static/chunks/framew...: 157ms CPU time
Info::
Unattributable: 151ms CPU time
Info::
https://www.bt.com/home/_next/static/chunks/pages/...: 138ms CPU time
Warning::
Third-party scripts: 1144ms (100% of total)

Main Thread Breakdown

Script Evaluation 56% Other 18% Script Parsing & Compilation 10% Style & Layout 9% Rendering 3%
ScriptTotalScriptingParse/CompileParty
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js259ms231ms22ms3rd
https://www.bt.com/209ms26ms0ms3rd
https://www.bt.com/home/_next/static/chunks/framework-050c1f32293f7182.js157ms116ms5ms3rd
Unattributable151ms6ms0ms3rd
https://www.bt.com/home/_next/static/chunks/pages/_app-c46a38d10daabda4.js138ms67ms48ms3rd
https://js-cdn.dynatrace.com/jstag/17f0bd28e42/bf88365yqv/95b067d34295602_complete.js113ms80ms9ms3rd
https://assets.adobedtm.com/launch-ENfdadf1bb09d848de85923e05be32e7d1.min.js64ms46ms16ms3rd
https://www.googletagmanager.com/gtag/js?id=G-19536D3EL252ms42ms10ms3rd
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
10 fonts (181 KB)
PASS
10 fonts (181 KB)
Info::
10 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

10

181 KB total

Render-blocking

0

of 10

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 FCP 525 ms LCP 1.7 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 — 20.3 KiB — 60 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 — 63 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 — 16.2 KiB — 120 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 — 155 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 — 130 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 — 57 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 — 6 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 — 10 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 — 446 B — 348 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 71 ms — font-display: swap
BTCurve_W_Rg.d1585de4.w... woff2 swap
Size 20 KB
Load time 60 ms
Start 177 ms
Risk FOUT — text flashes from fallback to web font
BTCurve_W_Headline.dfb8... woff2 swap
Size 21 KB
Load time 63 ms
Start 398 ms
Risk FOUT — text flashes from fallback to web font
Dottee-Condensed-Regula... woff2 swap
Size 16 KB
Load time 120 ms
Start 399 ms
Risk FOUT — text flashes from fallback to web font
Non-Dottee-Regular.32de... woff2 swap
Size 28 KB
Load time 155 ms
Start 399 ms
Risk FOUT — text flashes from fallback to web font
BTCurve_W_Bd.50264748.w... woff2 swap
Size 21 KB
Load time 130 ms
Start 400 ms
Risk FOUT — text flashes from fallback to web font
font-woff;charset=utf-8... woff swap
Size 2 KB
Load time 57 ms
Start 448 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 6 ms
Start 873 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 10 ms
Start 873 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 348 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 34 KB
Load time 71 ms
Start 1.2 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)

Fixing the unchecked items could save ~12 KB and ~24 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
102 requests over 2978ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 525 ms LCP 1.7 shttps://bt.com// https://bt.com/ — 301 — 37 B — 5 ms — h2https://www.bt.com/www.bt.com/ https://www.bt.com/ — 302 — 606 B — 34 ms — h2https://www.bt.com/www.bt.com/ https://www.bt.com/ — 200 — 3.0 KiB — 86 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 — 79 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 — 9 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 — 47 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 — 7 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 — 18 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 — 14 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 — 16 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 — 19 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 — 12 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 — 8 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 — 589 B — 7 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 — 202 B — 6 ms — h2https://www.bt.com/_Incapsula_Resource?SWJIYLWA=719d34d31c8e3a6e6fffd425f7e032f3&ns=1&cb=1604409801www.bt.com/_Incapsula_Resource?SWJI... https://www.bt.com/_Incapsula_Resource?SWJIYLWA=719d34d31c8e3a6e6fffd425f7e032f3&ns=1&cb=1604409801 — 200 — 20.0 KiB — 13 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 — 20.3 KiB — 60 ms — h2https://www.bt.com/_Incapsula_Resource?SWKMTFSR=1&e=0.39202436566028265www.bt.com/_Incapsula_Resource?SWKM... https://www.bt.com/_Incapsula_Resource?SWKMTFSR=1&e=0.39202436566028265 — 200 — 39 B — 3 ms — h2https://assets.adobedtm.com/extensions/EPc7341b33570d4c988798fc9f0093d4b2/AppMeasurement.min.jsassets.adobedtm.com/extensions/EPc7... https://assets.adobedtm.com/extensions/EPc7341b33570d4c988798fc9f0093d4b2/AppMeasurement.min.js — 200 — 12.9 KiB — 4 ms — h2https://assets.adobedtm.com/extensions/EPc7341b33570d4c988798fc9f0093d4b2/AppMeasurement_Module_ActivityMap.min.jsassets.adobedtm.com/extensions/EPc7... https://assets.adobedtm.com/extensions/EPc7341b33570d4c988798fc9f0093d4b2/AppMeasurement_Module_ActivityMap.min.js — 200 — 1.8 KiB — 4 ms — h2https://cdn-ukwest.onetrust.com/consent/93aec36f-64c3-487b-897d-5e8f88cbe7b9/otSDKStub.jscdn-ukwest.onetrust.com/consent/93a... https://cdn-ukwest.onetrust.com/consent/93aec36f-64c3-487b-897d-5e8f88cbe7b9/otSDKStub.js — 200 — 8.1 KiB — 99 ms — h2https://www.googletagmanager.com/gtag/js?id=G-19536D3EL2www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-19536D3EL2 — 200 — 176.7 KiB — 165 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/9.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/9.webp — 200 — 33.2 KiB — 42 ms — h2https://img01.products.bt.co.uk/content/dam/bt/storefront/bt-home/newcust-uplift/images/hero-banners/ee-tv/2026/march/10.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/10.webp — 200 — 24.7 KiB — 43 ms — h2https://img01.products.bt.co.uk/content/dam/bt/storefront/bt-home/newcust-uplift/images/hero-banners/ee-tv/2026/march/11.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/11.webp — 200 — 20.1 KiB — 44 ms — 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 — 46 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 — 176 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 — 80 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 — 5 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 — 7 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 — 834 B — 11 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 — 6.6 KiB — 194 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 — 154 ms — h2https://geolocation.onetrust.com/cookieconsentpub/v1/geo/locationgeolocation.onetrust.com/cookiecons... 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312 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 — 113 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 — 750 B — 6 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 — 6 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 — 10 ms — h2https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/styles__ltr.csswww.gstatic.com/recaptcha/releases/... 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— 403 — 446 B — 348 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 — 183 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 — 24 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 — 71 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 — 22 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 — 4 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 — 4 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 — 35.6 KiB — 11 ms — h2https://bf88365yqv.bf.dynatrace.com/bf?type=js3&sn=v_4_srv_4_sn_PMQ2FE1PS933F73LVE1VR1TR7HNODLO4_perc_100000_ol_0_mul_1_app-3A031b7bad6418e5d7_1_rcs-3Acss_0&svrid=4&flavor=cors&vi=RAFRHNQFGVRUMRACIFPKMRVTINFJKCMU-0&modifiedSince=1776681976299&bp=3&app=095b067d34295602&crc=3345162234&en=9hu61abe&end=1bf88365yqv.bf.dynatrace.com/bf?type... https://bf88365yqv.bf.dynatrace.com/bf?type=js3&sn=v_4_srv_4_sn_PMQ2FE1PS933F73LVE1VR1TR7HNODLO4_perc_100000_ol_0_mul_1_app-3A031b7bad6418e5d7_1_rcs-3Acss_0&svrid=4&flavor=cors&vi=RAFRHNQFGVRUMRACIFPKMRVTINFJKCMU-0&modifiedSince=1776681976299&bp=3&app=095b067d34295602&crc=3345162234&en=9hu61abe&end=1 — 200 — 406 B — 89 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 1144ms · 471KB · £17/mo
www.gstatic.com
Other
Costly
Execution 259ms
Transfer 0 KB
Unused 49%
Monthly Cost £4/mo
www.bt.com
Other
Costly
Execution 209ms
Transfer 3 KB
Monthly Cost £3/mo
www.bt.com
Other
Optional
Execution 157ms
Transfer 59 KB
Unused 38%
Monthly Cost £2/mo
Unattributable
Other
Optional
Execution 151ms
Transfer 0 KB
Monthly Cost £2/mo
www.bt.com
Other
Optional
Execution 138ms
Transfer 13 KB
Monthly Cost £2/mo
js-cdn.dynatrace.com
Other
Optional
Execution 113ms
Transfer 85 KB
Unused 36%
Monthly Cost £2/mo
assets.adobedtm.com
Other
Optional
Execution 64ms
Transfer 134 KB
Unused 49%
Monthly Cost £1/mo
Google Tag Manager
Tag Manager
Optional
Execution 52ms
Transfer 177 KB
Unused 44%
Monthly Cost £1/mo

These scripts may cost more than they're worth

  • www.gstatic.com adds 259ms and costs ~£4/month
  • www.bt.com adds 209ms 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.gstatic.com takes 259ms 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 209ms 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

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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