Performance
· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
4.80 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
17.78 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
2.38 s
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.000
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
7.39 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.
17.82 s
Page Load Progression
DPage Weight BudgetAction2.3 MB transferred, 122 requestsFIX
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
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.
High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.
Source: web.dev
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
FJS Execution CostAction6673ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.express.co.uk/ | 1459ms | 179ms | 43ms | 3rd |
| Unattributable | 885ms | 54ms | 0ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-NX7XL77 | 866ms | 675ms | 65ms | 3rd |
| https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604130101/pubads_impl.js?cb=31097849 | 438ms | 319ms | 60ms | 3rd |
| https://cmp.inmobi.com/tcfv2/61/cmp2.js?referer=www.express.co.uk | 410ms | 280ms | 56ms | 3rd |
| https://cdn.images.express.co.uk/js/dist/prebid20260414.min.js | 341ms | 225ms | 113ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-17949595080&cx=c>m=4e64e1 | 318ms | 263ms | 53ms | 3rd |
| https://cdn.images.express.co.uk/js/dist/prebid_express20260414.min.js | 294ms | 235ms | 47ms | 3rd |
| https://connect.facebook.net/en_US/fbevents.js | 259ms | 182ms | 75ms | 3rd |
| https://cdn.images.express.co.uk/@trinitymirrordigital/auth-ui/auth-ui.min.js?v=1fd39c450ef4387c0718b2aa4d9d179fde134e19 | 201ms | 147ms | 53ms | 3rd |
Showing top 10 of 21 scripts
FJS BundlesAction51 scripts, 853 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://cdn.images.express.co.uk/js/dist/prebid20260414.min.js | 174 KB | 142 KB (81%) | ✓ | 3rd |
| https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604130101/pubads_impl.js?cb=31097849 | 188 KB | 124 KB (66%) | ✓ | 3rd |
| https://cdn.images.express.co.uk/@trinitymirrordigital/auth-ui/auth-ui.min.js?v=1fd39c450ef4387c0718b2aa4d9d179fde134e19 | 131 KB | 89 KB (68%) | ✓ | 3rd |
| https://premium.express.co.uk/js/dist/app202602174.min.js | 97 KB | 66 KB (68%) | ✓ | 3rd |
| https://cdn.amplitude.com/libs/analytics-browser-gtm-wrapper-3.18.1.js.br | 74 KB | 63 KB (85%) | ✓ | 3rd |
| https://premium.express.co.uk/js/dist/app-pp20260212.min.js | 91 KB | 58 KB (64%) | ✓ | 3rd |
| https://cmp.inmobi.com/tcfv2/61/cmp2.js?referer=www.express.co.uk | 117 KB | 56 KB (49%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-NX7XL77 | 170 KB | 55 KB (33%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-17949595080&cx=c>m=4e64e1 | 140 KB | 54 KB (39%) | ✓ | 3rd |
| https://connect.facebook.net/en_US/fbevents.js | 96 KB | 34 KB (36%) | ✓ | 3rd |
Consider code splitting or tree shaking to reduce unused code.
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.
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.
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.
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.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
FPage Weight InventoryAction122 resources · 2.3 MB · 853 KB savings availableFIX
~852.8 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 122 resources | 2.3 MiB | ||||||
CImage OptimizationAction30 images, 0 KB saveableREVIEW
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
A+Text CompressionAll text resources are compressedPASS
A+Font Loading1 fonts (19 KB)PASS
Web fonts
1
19 KB total
Render-blocking
0
of 1
Dominant font-display
swap
Most common across fonts
Font loading timeline
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 CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource Hints24 hints, 0 missing preconnectsPASS
Current Resource Hints
24 resource hints configured
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
AHTTP Cachingmax-age=180 (3 minutes)PASS
public,max-age=180
| Directive | Value | Meaning |
|---|---|---|
| public | — | Any cache may store this response |
| max-age | 180 | Cache for 3 minutes |
Network Waterfall122 requests over 7946msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.express.co.uk www.express.co.uk | Other | 1459ms | 94 KB | — | £15/mo | Costly |
Unattributable Unattributable | Other | 885ms | 0 KB | — | £9/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 866ms | 170 KB | 33% | £9/mo | Costly |
securepubads.g.doubleclick.net securepubads.g.doubleclick.net | Other | 438ms | 188 KB | 66% | £5/mo | Costly |
cmp.inmobi.com cmp.inmobi.com | Other | 410ms | 117 KB | 49% | £4/mo | Costly |
cdn.images.express.co.uk cdn.images.express.co.uk | Other | 341ms | 174 KB | 81% | £4/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 318ms | 140 KB | 39% | £3/mo | Costly |
cdn.images.express.co.uk cdn.images.express.co.uk | Other | 294ms | 81 KB | 42% | £3/mo | Costly |
Facebook Pixel connect.facebook.net | Advertising | 259ms | 96 KB | 36% | £3/mo | Costly |
cdn.images.express.co.uk cdn.images.express.co.uk | Other | 201ms | 131 KB | 68% | £2/mo | Costly |
feliz-web-netro.data.tm-awx.com feliz-web-netro.data.tm-awx.com | Other | 184ms | 6 KB | — | £2/mo | Optional |
scripts.webcontentassessor.com scripts.webcontentassessor.com | Other | 164ms | 150 KB | — | £2/mo | Optional |
Facebook Pixel connect.facebook.net | Advertising | 142ms | 44 KB | — | £1/mo | Optional |
Amplitude cdn.amplitude.com | Analytics | 142ms | 74 KB | 85% | £1/mo | Optional |
Amplitude cdn.amplitude.com | Analytics | 116ms | 49 KB | 51% | £1/mo | Optional |
securepubads.g.doubleclick.net securepubads.g.doubleclick.net | Other | 105ms | 34 KB | — | £1/mo | Optional |
cdn.onesignal.com cdn.onesignal.com | Other | 104ms | 42 KB | 78% | £1/mo | Optional |
cdn.images.express.co.uk cdn.images.express.co.uk | Other | 72ms | 12 KB | — | £1/mo | Optional |
tags.crwdcntrl.net tags.crwdcntrl.net | Other | 65ms | 13 KB | — | £1/mo | Optional |
premium.express.co.uk premium.express.co.uk | Other | 57ms | 97 KB | 68% | £1/mo | Optional |
premium.express.co.uk premium.express.co.uk | Other | 51ms | 91 KB | 64% | £1/mo | Optional |
These scripts may cost more than they're worth
- www.express.co.uk adds 1459ms and costs ~£15/month
- Unattributable adds 885ms and costs ~£9/month
- Google Tag Manager adds 866ms and costs ~£9/month
- securepubads.g.doubleclick.net adds 438ms and costs ~£5/month
- cmp.inmobi.com adds 410ms and costs ~£4/month
- cdn.images.express.co.uk adds 341ms and costs ~£4/month
- Google Tag Manager adds 318ms and costs ~£3/month
- cdn.images.express.co.uk adds 294ms and costs ~£3/month
- Facebook Pixel adds 259ms and costs ~£3/month
- cdn.images.express.co.uk adds 201ms and costs ~£2/month
100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.
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.express.co.uk takes 1459ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
Unattributable takes 885ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
Google Tag Manager takes 866ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
securepubads.g.doubleclick.net takes 438ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
66% of securepubads.g.doubleclick.net's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
cmp.inmobi.com takes 410ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
cdn.images.express.co.uk takes 341ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
81% of cdn.images.express.co.uk's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
Google Tag Manager takes 318ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
cdn.images.express.co.uk takes 294ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
Facebook Pixel takes 259ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
cdn.images.express.co.uk takes 201ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
68% of cdn.images.express.co.uk's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
85% of Amplitude's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
51% of Amplitude's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
78% of cdn.onesignal.com's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
68% of premium.express.co.uk's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
64% of premium.express.co.uk's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev