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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
69
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.
92
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.

1.07 s

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

2.18 s

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

342 ms

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

0.021

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

1.97 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.

4.86 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
3.4 MB transferred, 108 requests
FIX
3.4 MB transferred, 108 requests
Warning::
Page weighs 11.7 MB (3.4 MB transferred)
Warning::
JavaScript is 2.4 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 2.4 MB
Warning::
108 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.71 g CO2 per page load
3.4 MB / 2.4 MB budget
3.4 MB transferred
108 requests
0.71 g CO2 per page load
JavaScript 2.4 MiB 72%
Images 384.8 KiB 11%
CSS 177.9 KiB 5%
Other 152.6 KiB 4%
Fonts 107.2 KiB 3%
HTML 65.9 KiB 2%
Other 42.8 KiB 1%
Other 39.3 KiB 1%
Other 916 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

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

Why this matters

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

Source: web.dev

D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (3.4 MiB of 3.4 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Bundles
Action
32 scripts, 836 KB unused
FIX
32 scripts, 836 KB unused
Warning::
https://www.which.co.uk/static/deliver/static/js/m...: 194 KB unused (45%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.which.co.uk/static/deliver/static/js/s...: 116 KB unused (85%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://pagead2.googlesyndication.com/pagead/manag...: 108 KB unused (57%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn-ukwest.onetrust.com/scripttemplates/20...: 73 KB unused (56%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/destination?...: 65 KB unused (50%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 836 KB
836 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.which.co.uk/static/deliver/static/js/main.caa69650.js431 KB194 KB (45%)✓3rd
https://www.which.co.uk/static/deliver/static/js/seatbelt.3ff239be.js136 KB116 KB (85%)✓3rd
https://pagead2.googlesyndication.com/pagead/managed/js/gpt/m202604160201/pubads_impl.js188 KB108 KB (57%)✓3rd
https://cdn-ukwest.onetrust.com/scripttemplates/202604.1.0/otBannerSdk.js131 KB73 KB (56%)✓3rd
https://www.googletagmanager.com/gtag/destination?id=DC-4401979&cx=c&gtm=4e64h1h1131 KB65 KB (50%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-B458RCR961&cx=c&gtm=4e64h1h1168 KB65 KB (38%)✓3rd
https://www.googletagmanager.com/gtag/destination?id=AW-973097869&cx=c&gtm=4e64h1h1144 KB63 KB (44%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5MWP3HF118 KB60 KB (51%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TKMRQ5B3&gtm=4e64h1h1207 KB53 KB (26%)✓3rd
https://www.which.co.uk/static/deliver/static/js/libs.d2d8f11b.js92 KB40 KB (44%)✓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
108 resources · 3.4 MB · 836 KB savings available
FIX
108 resources · 3.4 MB · 836 KB savings available
Warning::
Page weight 2.4 MB over 1MB target
Got: 3.4 MB Expected: ≤ 1 MB
Info::
~836 KB of savings available
Warning::
107 third-party resources (100% of weight)
Info::
3 resources over 200KB
108 resources · 3.4 MiB · 107 third-party 2.4 MiB over 1MB target
JavaScript 73% · 2.5 MiB
Image 12% · 400.8 KiB
CSS 5% · 182.7 KiB
Other 5% · 167.4 KiB
Font 3% · 107.2 KiB
Document 2% · 68.5 KiB

~835.8 KiB of savings available

Remove unused JavaScript: 835.8 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
39 images, 0 KB saveable
REVIEW
39 images, 0 KB saveable
Warning::
is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
39 images 385 KB
0 oversized -0 KB
21 legacy format
1 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

C
JS Execution Cost
Action
1475ms total JS execution
REVIEW
1475ms total JS execution
Warning::
https://www.which.co.uk/static/deliver/static/js/m...: 318ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-TKM...: 316ms CPU time
Info::
https://www.which.co.uk/: 230ms CPU time
Info::
Unattributable: 188ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-B458...: 112ms CPU time
Warning::
Third-party scripts: 1475ms (100% of total)

Main Thread Breakdown

Script Evaluation 65% Other 11% Script Parsing & Compilation 10% Style & Layout 9%
ScriptTotalScriptingParse/CompileParty
https://www.which.co.uk/static/deliver/static/js/main.caa69650.js318ms272ms39ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TKMRQ5B3&gtm=4e64h1h1316ms279ms15ms3rd
https://www.which.co.uk/230ms9ms7ms3rd
Unattributable188ms62ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-B458RCR961&cx=c&gtm=4e64h1h1112ms86ms14ms3rd
https://pagead2.googlesyndication.com/pagead/managed/js/gpt/m202604160201/pubads_impl.js98ms74ms15ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5MWP3HF80ms73ms7ms3rd
https://cdn-ukwest.onetrust.com/scripttemplates/202604.1.0/otBannerSdk.js77ms57ms12ms3rd
https://www.googletagmanager.com/gtag/destination?id=AW-973097869&cx=c&gtm=4e64h1h157ms47ms10ms3rd
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
3 fonts (107 KB)
PASS
3 fonts (107 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

107 KB total

Render-blocking

0

of 3

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 1.1 s LCP 2.2 shttps://www.which.co.uk/global/fonts/national-2/national-2-regular/national-2-regular.woff2national-2-regular.woff2 https://www.which.co.uk/global/fonts/national-2/national-2-regular/national-2-regular.woff2 — 34.0 KiB — 44 ms — font-display: swaphttps://www.which.co.uk/global/fonts/national-2/national-2-medium/national-2-medium.woff2national-2-medium.woff2 https://www.which.co.uk/global/fonts/national-2/national-2-medium/national-2-medium.woff2 — 37.0 KiB — 52 ms — font-display: swaphttps://www.which.co.uk/global/fonts/national-2/national-2-bold/national-2-bold.woff2national-2-bold.woff2 https://www.which.co.uk/global/fonts/national-2/national-2-bold/national-2-bold.woff2 — 36.3 KiB — 63 ms — font-display: swap
national-2-regular.woff2 woff2 swap
Size 34 KB
Load time 44 ms
Start 371 ms
Risk FOUT — text flashes from fallback to web font
national-2-medium.woff2 woff2 swap
Size 37 KB
Load time 52 ms
Start 373 ms
Risk FOUT — text flashes from fallback to web font
national-2-bold.woff2 woff2 swap
Size 36 KB
Load time 63 ms
Start 373 ms
Risk FOUT — text flashes from fallback to web font
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)
A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
108 requests over 2926ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 1.1 s LCP 2.2 shttps://which.co.uk// https://which.co.uk/ — 301 — 132 B — 101 ms — h2https://www.which.co.uk/www.which.co.uk/ https://www.which.co.uk/ — 200 — 56.2 KiB — 285 ms — h2https://cdn-ukwest.onetrust.com/consent/44f8a169-169a-488f-b9fb-0bcd25346816/otSDKStub.jscdn-ukwest.onetrust.com/consent/44f... https://cdn-ukwest.onetrust.com/consent/44f8a169-169a-488f-b9fb-0bcd25346816/otSDKStub.js — 200 — 15.2 KiB — 95 ms — h2https://www.which.co.uk/global/fonts/national-2/national-2-regular/national-2-regular.woff2www.which.co.uk/global/fonts/nation... https://www.which.co.uk/global/fonts/national-2/national-2-regular/national-2-regular.woff2 — 200 — 34.0 KiB — 44 ms — h2https://www.which.co.uk/global/fonts/national-2/national-2-medium/national-2-medium.woff2www.which.co.uk/global/fonts/nation... https://www.which.co.uk/global/fonts/national-2/national-2-medium/national-2-medium.woff2 — 200 — 37.0 KiB — 52 ms — h2https://www.which.co.uk/global/fonts/national-2/national-2-bold/national-2-bold.woff2www.which.co.uk/global/fonts/nation... https://www.which.co.uk/global/fonts/national-2/national-2-bold/national-2-bold.woff2 — 200 — 36.3 KiB — 63 ms — h2https://www.which.co.uk/static/deliver/static/css/pages-home-HomePage.085e4a6c.chunk.csswww.which.co.uk/static/deliver/stat... https://www.which.co.uk/static/deliver/static/css/pages-home-HomePage.085e4a6c.chunk.css — 200 — 4.6 KiB — 26 ms — h2https://www.which.co.uk/static/deliver/static/css/main.1fbb05bd.csswww.which.co.uk/static/deliver/stat... https://www.which.co.uk/static/deliver/static/css/main.1fbb05bd.css — 200 — 37.1 KiB — 33 ms — h2https://www.which.co.uk/static/deliver/static/css/seatbelt.fe9de651.csswww.which.co.uk/static/deliver/stat... https://www.which.co.uk/static/deliver/static/css/seatbelt.fe9de651.css — 200 — 31.0 KiB — 47 ms — h2https://www.which.co.uk/static/deliver/static/js/runtime-main.fe31f1a7.jswww.which.co.uk/static/deliver/stat... https://www.which.co.uk/static/deliver/static/js/runtime-main.fe31f1a7.js — 200 — 4.8 KiB — 29 ms — h2https://www.which.co.uk/static/deliver/static/js/libs.d2d8f11b.jswww.which.co.uk/static/deliver/stat... https://www.which.co.uk/static/deliver/static/js/libs.d2d8f11b.js — 200 — 92.0 KiB — 60 ms — h2https://www.which.co.uk/static/deliver/static/js/seatbelt.3ff239be.jswww.which.co.uk/static/deliver/stat... https://www.which.co.uk/static/deliver/static/js/seatbelt.3ff239be.js — 200 — 136.4 KiB — 97 ms — h2https://www.which.co.uk/static/deliver/static/js/main.caa69650.jswww.which.co.uk/static/deliver/stat... https://www.which.co.uk/static/deliver/static/js/main.caa69650.js — 200 — 431.1 KiB — 95 ms — h2https://www.which.co.uk/static/deliver/static/js/src_pages_home_components_EditableCTAPanel_EditableCTAPanel_tsx-src_shared_data-layer_tsx-src-7597af.8e4a7e26.chunk.jswww.which.co.uk/static/deliver/stat... https://www.which.co.uk/static/deliver/static/js/src_pages_home_components_EditableCTAPanel_EditableCTAPanel_tsx-src_shared_data-layer_tsx-src-7597af.8e4a7e26.chunk.js — 200 — 7.5 KiB — 64 ms — h2https://www.which.co.uk/static/deliver/static/js/pages-home-HomePage.1fe1b876.chunk.jswww.which.co.uk/static/deliver/stat... https://www.which.co.uk/static/deliver/static/js/pages-home-HomePage.1fe1b876.chunk.js — 200 — 12.8 KiB — 64 ms — h2https://media.product.which.co.uk/prod/images/ar_2to1_700x350/75f3be41ea9d-mowing.webpmedia.product.which.co.uk/prod/imag... https://media.product.which.co.uk/prod/images/ar_2to1_700x350/75f3be41ea9d-mowing.webp — 200 — 103.3 KiB — 80 ms — h2https://media.product.which.co.uk/prod/images/320_160/gm-875fd771-35b2-4d81-b525-3fff518e4ec8-porridgenews-inline.jpegmedia.product.which.co.uk/prod/imag... https://media.product.which.co.uk/prod/images/320_160/gm-875fd771-35b2-4d81-b525-3fff518e4ec8-porridgenews-inline.jpeg — 200 — 15.0 KiB — 170 ms — h2https://media.product.which.co.uk/prod/images/ar_2to1_320x160/5a0538b9b70e-lead-1.webpmedia.product.which.co.uk/prod/imag... https://media.product.which.co.uk/prod/images/ar_2to1_320x160/5a0538b9b70e-lead-1.webp — 200 — 5.8 KiB — 137 ms — h2https://cdn-ukwest.onetrust.com/consent/44f8a169-169a-488f-b9fb-0bcd25346816/44f8a169-169a-488f-b9fb-0bcd25346816.jsoncdn-ukwest.onetrust.com/consent/44f... https://cdn-ukwest.onetrust.com/consent/44f8a169-169a-488f-b9fb-0bcd25346816/44f8a169-169a-488f-b9fb-0bcd25346816.json — 200 — 1.9 KiB — 44 ms — h2https://media.product.which.co.uk/prod/images/ar_2to1_320x160/bbf3e7f4793c-photo-from-rory-2-1.webpmedia.product.which.co.uk/prod/imag... https://media.product.which.co.uk/prod/images/ar_2to1_320x160/bbf3e7f4793c-photo-from-rory-2-1.webp — 200 — 9.8 KiB — 133 ms — h2https://media.product.which.co.uk/prod/images/320_160/gm-aef2ff2f-2cc6-4622-b530-b4c5a2afba54-flight-departure-board-showing-cancelled-flights.jpgmedia.product.which.co.uk/prod/imag... https://media.product.which.co.uk/prod/images/320_160/gm-aef2ff2f-2cc6-4622-b530-b4c5a2afba54-flight-departure-board-showing-cancelled-flights.jpg — 200 — 11.2 KiB — 112 ms — h2https://media.product.which.co.uk/prod/images/320_160/gm-007133a3-e4fa-4fc0-b1b7-1f92a824d996-pac-codes-and-unlocking.jpegmedia.product.which.co.uk/prod/imag... https://media.product.which.co.uk/prod/images/320_160/gm-007133a3-e4fa-4fc0-b1b7-1f92a824d996-pac-codes-and-unlocking.jpeg — 200 — 7.4 KiB — 139 ms — h2https://media.product.which.co.uk/prod/images/ar_2to1_320x160/a8ac5447f2fb-brown-bread-on-shelf.webpmedia.product.which.co.uk/prod/imag... https://media.product.which.co.uk/prod/images/ar_2to1_320x160/a8ac5447f2fb-brown-bread-on-shelf.webp — 200 — 14.7 KiB — 109 ms — h2https://media.product.which.co.uk/prod/images/ar_2to1_320x160/78cd77bdf717-circulation-booster.webpmedia.product.which.co.uk/prod/imag... https://media.product.which.co.uk/prod/images/ar_2to1_320x160/78cd77bdf717-circulation-booster.webp — 200 — 9.0 KiB — 107 ms — h2https://media.product.which.co.uk/prod/images/ar_2to1_320x160/6ebea8a15649-drinking-water.webpmedia.product.which.co.uk/prod/imag... https://media.product.which.co.uk/prod/images/ar_2to1_320x160/6ebea8a15649-drinking-water.webp — 200 — 5.5 KiB — 23 ms — h2https://media.product.which.co.uk/prod/images/320_160/gm-8afadf12-5f8e-46dd-ad05-ca45e150910e-washing-up-liquidinline.jpegmedia.product.which.co.uk/prod/imag... https://media.product.which.co.uk/prod/images/320_160/gm-8afadf12-5f8e-46dd-ad05-ca45e150910e-washing-up-liquidinline.jpeg — 200 — 7.2 KiB — 142 ms — h2https://media.product.which.co.uk/prod/images/ar_2to1_320x160/0ecdefcf98f8-making-suncream-fun.webpmedia.product.which.co.uk/prod/imag... https://media.product.which.co.uk/prod/images/ar_2to1_320x160/0ecdefcf98f8-making-suncream-fun.webp — 200 — 5.8 KiB — 111 ms — h2https://pagead2.googlesyndication.com/tag/js/gpt.jspagead2.googlesyndication.com/tag/j... https://pagead2.googlesyndication.com/tag/js/gpt.js — 200 — 33.6 KiB — 124 ms — h3https://www.googletagmanager.com/gtm.js?id=GTM-5MWP3HFwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-5MWP3HF — 200 — 117.5 KiB — 154 ms — h2https://www.which.co.uk/static/deliver/manifest.jsonwww.which.co.uk/static/deliver/mani... https://www.which.co.uk/static/deliver/manifest.json — 200 — 916 B — 61 ms — h2
0 ms 1.0 s 2.0 s 3.0 s FCP 1.1 s LCP 2.2 shttps://which.co.uk// https://which.co.uk/ — 301 — 132 B — 101 ms — h2https://www.which.co.uk/www.which.co.uk/ https://www.which.co.uk/ — 200 — 56.2 KiB — 285 ms — h2https://cdn-ukwest.onetrust.com/consent/44f8a169-169a-488f-b9fb-0bcd25346816/otSDKStub.jscdn-ukwest.onetrust.com/consent/44f... https://cdn-ukwest.onetrust.com/consent/44f8a169-169a-488f-b9fb-0bcd25346816/otSDKStub.js — 200 — 15.2 KiB — 95 ms — h2https://www.which.co.uk/global/fonts/national-2/national-2-regular/national-2-regular.woff2www.which.co.uk/global/fonts/nation... https://www.which.co.uk/global/fonts/national-2/national-2-regular/national-2-regular.woff2 — 200 — 34.0 KiB — 44 ms — h2https://www.which.co.uk/global/fonts/national-2/national-2-medium/national-2-medium.woff2www.which.co.uk/global/fonts/nation... https://www.which.co.uk/global/fonts/national-2/national-2-medium/national-2-medium.woff2 — 200 — 37.0 KiB — 52 ms — 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h3https://which-group.my.site.com/ESWWhichWebChannel1722449535433/assets/js/inert.min.jswhich-group.my.site.com/ESWWhichWeb... https://which-group.my.site.com/ESWWhichWebChannel1722449535433/assets/js/inert.min.js — 200 — 2.7 KiB — 16 ms — h2https://which-group.my.site.com/ESWWhichWebChannel1722449535433/webruntime/framework/1e7fb74fd8/prod/lwr_loaderwhich-group.my.site.com/ESWWhichWeb... https://which-group.my.site.com/ESWWhichWebChannel1722449535433/webruntime/framework/1e7fb74fd8/prod/lwr_loader — 200 — 8.4 KiB — 32 ms — h2https://which-group.my.site.com/ESWWhichWebChannel1722449535433/webruntime/framework/eac802e7d8/prod/lwr_bootstrapwhich-group.my.site.com/ESWWhichWeb... https://which-group.my.site.com/ESWWhichWebChannel1722449535433/webruntime/framework/eac802e7d8/prod/lwr_bootstrap — 200 — 28.6 KiB — 42 ms — h2https://which-group.my.site.com/ESWWhichWebChannel1722449535433/webruntime/framework/6bba9463ca/prod/lwr_app_bootstrap_hookwhich-group.my.site.com/ESWWhichWeb... https://which-group.my.site.com/ESWWhichWebChannel1722449535433/webruntime/framework/6bba9463ca/prod/lwr_app_bootstrap_hook — 200 — 4.5 KiB — 33 ms — h2https://which-group.my.site.com/ESWWhichWebChannel1722449535433/webruntime/framework/9faac7844c/prod/lwr_lwcwhich-group.my.site.com/ESWWhichWeb... https://which-group.my.site.com/ESWWhichWebChannel1722449535433/webruntime/framework/9faac7844c/prod/lwr_lwc — 200 — 29.8 KiB — 44 ms — h2https://which-group.my.site.com/ESWWhichWebChannel1722449535433/webruntime/framework/e3a62caf58/prod/lwr_appwhich-group.my.site.com/ESWWhichWeb... https://which-group.my.site.com/ESWWhichWebChannel1722449535433/webruntime/framework/e3a62caf58/prod/lwr_app — 200 — 75.4 KiB — 49 ms — h2https://which-group.my.site.com/ESWWhichWebChannel1722449535433/webruntime/view/ff7f583c6b4ab38ab09b239549c7b22d/prod/en-US/home_viewwhich-group.my.site.com/ESWWhichWeb... https://which-group.my.site.com/ESWWhichWebChannel1722449535433/webruntime/view/ff7f583c6b4ab38ab09b239549c7b22d/prod/en-US/home_view — 200 — 393.4 KiB — 66 ms — h2https://which-group.my.site.com/ESWWhichWebChannel1722449535433/webruntime/component/259a789b5905e4a3e65c0942cc97421d/prod/en-US/force/luvioLwcBindings_cmpwhich-group.my.site.com/ESWWhichWeb... https://which-group.my.site.com/ESWWhichWebChannel1722449535433/webruntime/component/259a789b5905e4a3e65c0942cc97421d/prod/en-US/force/luvioLwcBindings_cmp — 200 — 2.0 KiB — 53 ms — h2https://which-group.my.site.com/ESWWhichWebChannel1722449535433/webruntime/component/5b8557d8725fba2dbf2e6a4968ec430c/prod/en-US/force/luvioRuntimeWebruntime_cmpwhich-group.my.site.com/ESWWhichWeb... https://which-group.my.site.com/ESWWhichWebChannel1722449535433/webruntime/component/5b8557d8725fba2dbf2e6a4968ec430c/prod/en-US/force/luvioRuntimeWebruntime_cmp — 200 — 5.5 KiB — 55 ms — h2https://which-group.my.site.com/ESWWhichWebChannel1722449535433/webruntime/view/0285258d58025b42bb22fa8bbde32189/prod/en-US/frame_viewwhich-group.my.site.com/ESWWhichWeb... https://which-group.my.site.com/ESWWhichWebChannel1722449535433/webruntime/view/0285258d58025b42bb22fa8bbde32189/prod/en-US/frame_view — 200 — 19.4 KiB — 57 ms — h2https://which-group.my.site.com/ESWWhichWebChannel1722449535433/assets/styles/embedded-messaging-styling.min.css?893bd0ef97which-group.my.site.com/ESWWhichWeb... https://which-group.my.site.com/ESWWhichWebChannel1722449535433/assets/styles/embedded-messaging-styling.min.css?893bd0ef97 — 200 — 586 B — 34 ms — h2https://which-group.my.site.com/ESWWhichWebChannel1722449535433/assets/styles/salesforce-lightning-design-system.min.css?893bd0ef97which-group.my.site.com/ESWWhichWeb... https://which-group.my.site.com/ESWWhichWebChannel1722449535433/assets/styles/salesforce-lightning-design-system.min.css?893bd0ef97 — 200 — 101.9 KiB — 43 ms — h2https://ade.googlesyndication.com/ddm/activity/src=4401979;type=core-0;cat=blwhi008;rcb=5;ord=1;num=9605244637767;npa=1;uaa=x86;uab=64;uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0;uamb=0;uam=;uap=macOS;uapv=10.15.7;uaw=0;pscdl=denied;frm=0;_tu=KJA;gtm=45fe64h1h1v9181661302z89244820873za20gzb9244820873zd79090636xea;gcs=G100;gcd=13p3pPp2p5l1;dma_cps=-;dma=1;dc_fmt=8;tag_exp=0~115616986~115938465~115938468~117266400~117884344;epver=2;~oref=https%3A%2F%2Fwww.which.co.uk%2F?ade.googlesyndication.com/ddm/activ... https://ade.googlesyndication.com/ddm/activity/src=4401979;type=core-0;cat=blwhi008;rcb=5;ord=1;num=9605244637767;npa=1;uaa=x86;uab=64;uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0;uamb=0;uam=;uap=macOS;uapv=10.15.7;uaw=0;pscdl=denied;frm=0;_tu=KJA;gtm=45fe64h1h1v9181661302z89244820873za20gzb9244820873zd79090636xea;gcs=G100;gcd=13p3pPp2p5l1;dma_cps=-;dma=1;dc_fmt=8;tag_exp=0~115616986~115938465~115938468~117266400~117884344;epver=2;~oref=https%3A%2F%2Fwww.which.co.uk%2F? — 302 — 778 B — 80 ms — h2https://ep2.adtrafficquality.google/sodar/sodar2/254/runner.htmlep2.adtrafficquality.google/sodar/s... https://ep2.adtrafficquality.google/sodar/sodar2/254/runner.html — 200 — 5.8 KiB — 74 ms — h2https://ade.googlesyndication.com/ddm/activity/src=4401979;dc_pre=CNXdpPuNgJQDFcRGpAQdgQkj8A;type=core-0;cat=blwhi008;rcb=5;ord=1;num=9605244637767;npa=1;uaa=x86;uab=64;uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0;uamb=0;uam=;uap=macOS;uapv=10.15.7;uaw=0;pscdl=denied;frm=0;_tu=KJA;gtm=45fe64h1h1v9181661302z89244820873za20gzb9244820873zd79090636xea;gcs=G100;gcd=13p3pPp2p5l1;dma_cps=-;dma=1;dc_fmt=8;tag_exp=0~115616986~115938465~115938468~117266400~117884344;epver=2;~oref=https%3A%2F%2Fwww.which.co.uk%2F?ade.googlesyndication.com/ddm/activ... https://ade.googlesyndication.com/ddm/activity/src=4401979;dc_pre=CNXdpPuNgJQDFcRGpAQdgQkj8A;type=core-0;cat=blwhi008;rcb=5;ord=1;num=9605244637767;npa=1;uaa=x86;uab=64;uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0;uamb=0;uam=;uap=macOS;uapv=10.15.7;uaw=0;pscdl=denied;frm=0;_tu=KJA;gtm=45fe64h1h1v9181661302z89244820873za20gzb9244820873zd79090636xea;gcs=G100;gcd=13p3pPp2p5l1;dma_cps=-;dma=1;dc_fmt=8;tag_exp=0~115616986~115938465~115938468~117266400~117884344;epver=2;~oref=https%3A%2F%2Fwww.which.co.uk%2F? — 200 — 118 B — 30 ms — h2https://pagead2.googlesyndication.com/bg/dj12lhpBI2WR1GQ6n5lcmp69XlpHOiTAWO7c9b6NTo0.jspagead2.googlesyndication.com/bg/dj... https://pagead2.googlesyndication.com/bg/dj12lhpBI2WR1GQ6n5lcmp69XlpHOiTAWO7c9b6NTo0.js — 200 — 21.6 KiB — 79 ms — h3https://ep2.adtrafficquality.google/generate_204?froO2Qep2.adtrafficquality.google/generat... https://ep2.adtrafficquality.google/generate_204?froO2Q — 204 — 40 B — 24 ms — h2https://ep1.adtrafficquality.google/pagead/sodar?id=sodar2&v=254&t=2&li=gpt_m202604160201&jk=3415996382515790&bg=!W1ilWDrNAAY2C5OeFgs7AEcBe5WfOA7aMOSbdCla5VtD655bLcnT7jxQiPThwPHYcgyanzYYsDbOWj7N4_Q0aJHu5FFfkA1kvACIzgfzJmq4ylTuFFNTdwIAAABKUgAAAAVoAQd-ADcx-wfSjyA0H_Hp2FxcQ_-RRh1GAv3zUpAB38v2M88vA7JVv_WmENsZoHJfKq59zennbhltY6IXmQKWQHieZYyIaRPVUTNXbZwbMQLfApOOfiYi1f6PX2yi4zALGvlp0-AQhSIf57CDkxTaufx6j84t8s83GwE0l1wGTMZN8JXpHlQV57WSKJzCGiXoGb7Jv9RHj_JcDSjH84nZi8bh8nsvqnKwRlQMUpDcgWiwvasDpSn-ijDAx3nvFhiE6t0rLP9TXtgOuMo6hTgpwu98gQ4qUbuSfvRws4_EdPXP_ThG7Urk5oB_RNV2A620gCXydu9AbmijfGixQbaEO8dbpVtthFllpo5e75OhQ4ITn-WW-_ZeoPDfNYcjrQpi8iqy2W5iStogQB9ZvhZdxLwI17FKy2uJPJKFdd1YmW4tjai0z5b8EhTNofGjbSiJJUmJhskOYBg1LPAEDpNb4NCL3mVeiiAOwxvPe__U0MpUPgLRM9NCdLdM1s15-f8uOKbOstU_yYi1pVeOgCGWUUjo8DlnAXeryKTla8afPxExcWkguVPNqpBVeFBa_RQO-aIOvnMGhpieqlLT1V2xEGHIXA84yIdryuDGjh2d1agUJJxQhUroShSZe36r7Z5R7w1rVHxfH3bCJ1ijd-XwvXezl3JTxqylVtU2IMdQd9JoSjKxHYzQCiaCI-B0zSYctFX1f6Mh9O3zblG3AvFHaWMKr3bZp2sv2V0_jgdEPkWCg0brcYtYzB8GHtuINGEbtdSksjFouEnAGcDs1ixNQgA4OX7l2FadBxXWm6MOSdrqBJ4jelDA1C2TGxrpzXm4BmD3u2U1I6xE89CdralgBRec-VTY9jWwOYcBK-8__FNCPz6EjPmB-KsyL-WvlRU2G5FVd3VXO2zZ920qNdZbuKzVdGzo3KrzQ8gqzHPZRN8CC1UGojViO7XqfuAU2tBS6l5FuRsep1.adtrafficquality.google/pagead/... https://ep1.adtrafficquality.google/pagead/sodar?id=sodar2&v=254&t=2&li=gpt_m202604160201&jk=3415996382515790&bg=!W1ilWDrNAAY2C5OeFgs7AEcBe5WfOA7aMOSbdCla5VtD655bLcnT7jxQiPThwPHYcgyanzYYsDbOWj7N4_Q0aJHu5FFfkA1kvACIzgfzJmq4ylTuFFNTdwIAAABKUgAAAAVoAQd-ADcx-wfSjyA0H_Hp2FxcQ_-RRh1GAv3zUpAB38v2M88vA7JVv_WmENsZoHJfKq59zennbhltY6IXmQKWQHieZYyIaRPVUTNXbZwbMQLfApOOfiYi1f6PX2yi4zALGvlp0-AQhSIf57CDkxTaufx6j84t8s83GwE0l1wGTMZN8JXpHlQV57WSKJzCGiXoGb7Jv9RHj_JcDSjH84nZi8bh8nsvqnKwRlQMUpDcgWiwvasDpSn-ijDAx3nvFhiE6t0rLP9TXtgOuMo6hTgpwu98gQ4qUbuSfvRws4_EdPXP_ThG7Urk5oB_RNV2A620gCXydu9AbmijfGixQbaEO8dbpVtthFllpo5e75OhQ4ITn-WW-_ZeoPDfNYcjrQpi8iqy2W5iStogQB9ZvhZdxLwI17FKy2uJPJKFdd1YmW4tjai0z5b8EhTNofGjbSiJJUmJhskOYBg1LPAEDpNb4NCL3mVeiiAOwxvPe__U0MpUPgLRM9NCdLdM1s15-f8uOKbOstU_yYi1pVeOgCGWUUjo8DlnAXeryKTla8afPxExcWkguVPNqpBVeFBa_RQO-aIOvnMGhpieqlLT1V2xEGHIXA84yIdryuDGjh2d1agUJJxQhUroShSZe36r7Z5R7w1rVHxfH3bCJ1ijd-XwvXezl3JTxqylVtU2IMdQd9JoSjKxHYzQCiaCI-B0zSYctFX1f6Mh9O3zblG3AvFHaWMKr3bZp2sv2V0_jgdEPkWCg0brcYtYzB8GHtuINGEbtdSksjFouEnAGcDs1ixNQgA4OX7l2FadBxXWm6MOSdrqBJ4jelDA1C2TGxrpzXm4BmD3u2U1I6xE89CdralgBRec-VTY9jWwOYcBK-8__FNCPz6EjPmB-KsyL-WvlRU2G5FVd3VXO2zZ920qNdZbuKzVdGzo3KrzQ8gqzHPZRN8CC1UGojViO7XqfuAU2tBS6l5FuRs — 204 — 17 B — 47 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 1475ms · 1443KB · £15/mo
www.which.co.uk
Other
Costly
Execution 318ms
Transfer 431 KB
Unused 45%
Monthly Cost £3/mo
Google Tag Manager
Tag Manager
Costly
Execution 316ms
Transfer 207 KB
Unused 26%
Monthly Cost £3/mo
www.which.co.uk
Other
Costly
Execution 230ms
Transfer 56 KB
Monthly Cost £2/mo
Unattributable
Other
Optional
Execution 188ms
Transfer 0 KB
Monthly Cost £2/mo
Google Tag Manager
Tag Manager
Optional
Execution 112ms
Transfer 168 KB
Unused 38%
Monthly Cost £1/mo
pagead2.googlesyndication.com
Other
Optional
Execution 98ms
Transfer 188 KB
Unused 57%
Monthly Cost £1/mo
Google Tag Manager
Tag Manager
Optional
Execution 80ms
Transfer 118 KB
Unused 51%
Monthly Cost £1/mo
cdn-ukwest.onetrust.com
Other
Optional
Execution 77ms
Transfer 131 KB
Unused 56%
Monthly Cost £1/mo
Google Tag Manager
Tag Manager
Optional
Execution 57ms
Transfer 144 KB
Unused 44%
Monthly Cost £1/mo

These scripts may cost more than they're worth

  • www.which.co.uk adds 318ms and costs ~£3/month
  • Google Tag Manager adds 316ms and costs ~£3/month
  • www.which.co.uk adds 230ms and costs ~£2/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.which.co.uk takes 318ms 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 316ms 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.which.co.uk takes 230ms 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

57% of pagead2.googlesyndication.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

51% of Google Tag Manager'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

56% 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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