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.
8.61 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
24.73 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
1.04 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.
11.88 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.
26.12 s
Page Load Progression
790 ms 1.6 s
2.4 s
3.2 s
4.0 s
4.7 s
5.5 s
6.3 sFPage Weight BudgetAction4.9 MB transferred, 197 requestsFIX
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.
Source: web.dev
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
Subset fonts to include only used characters, or switch to system font stacks.
Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).
Source: web.dev font loading
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 CostAction7376ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.walesonline.co.uk/ | 2160ms | 25ms | 72ms | 3rd |
| Unattributable | 997ms | 63ms | 0ms | 3rd |
| https://www.walesonline.co.uk/nav-web-static/main-7d527e9aab619128ce0f0a829af162c8310e6e1a/_next/static/chunks/3794-7315db15a5700b37.js | 825ms | 760ms | 19ms | 3rd |
| https://cmp.inmobi.com/tcfv2/61/cmp2ui-en.js | 500ms | 312ms | 49ms | 3rd |
| https://cmp.inmobi.com/tcfv2/61/cmp2.js?referer=walesonline.co.uk | 465ms | 320ms | 49ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-WL2JKZG | 329ms | 271ms | 46ms | 3rd |
| https://feliz-web.data.tm-awx.com/smile-web.min.js | 303ms | 133ms | 2ms | 3rd |
| https://www.walesonline.co.uk/nav-web-static/main-7d527e9aab619128ce0f0a829af162c8310e6e1a/_next/static/chunks/4bd1b696-0ebdac3fb1a19ae7.js | 281ms | 65ms | 21ms | 3rd |
| https://scripts.webcontentassessor.com/scripts/370edbafa5296ef2074359ed0f0cb50d2775bd2cd6067dc81a99998410a888b3 | 227ms | 175ms | 45ms | 3rd |
| https://s2-prod.walesonline.co.uk/@trinitymirrordigital/auth-ui/auth-ui.min.js?v=v260318 | 212ms | 156ms | 50ms | 3rd |
Showing top 10 of 19 scripts
FJS BundlesAction47 scripts, 681 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604160201/pubads_impl.js | 188 KB | 143 KB (76%) | ✓ | 3rd |
| https://s2-prod.walesonline.co.uk/@trinitymirrordigital/auth-ui/auth-ui.min.js?v=v260318 | 133 KB | 79 KB (60%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-WL2JKZG | 168 KB | 71 KB (42%) | ✓ | 3rd |
| https://cmp.inmobi.com/tcfv2/61/cmp2.js?referer=walesonline.co.uk | 134 KB | 69 KB (52%) | ✓ | 3rd |
| https://cdn.amplitude.com/libs/analytics-browser-gtm-wrapper-2.36.8.min.js.br | 80 KB | 66 KB (84%) | ✓ | 3rd |
| https://cmp.inmobi.com/tcfv2/61/cmp2ui-en.js | 125 KB | 60 KB (48%) | ✓ | 3rd |
| https://www.walesonline.co.uk/nav-web-static/main-7d527e9aab619128ce0f0a829af162c8310e6e1a/_next/static/chunks/9308-a0fa6767bee242d9.js | 81 KB | 36 KB (45%) | ✓ | 3rd |
| https://cdn.onesignal.com/sdks/web/v16/OneSignalSDK.page.es6.js?v=160603 | 42 KB | 32 KB (78%) | ✓ | 3rd |
| https://cdn.eu.amplitude.com/libs/analytics-browser-2.25.0-min.js.gz | 50 KB | 32 KB (64%) | ✓ | 3rd |
| https://cdn.amplitude.com/libs/analytics-browser-gtm-2.36.8-min.js.gz | 55 KB | 29 KB (53%) | ✓ | 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 InventoryAction197 resources · 4.9 MB · 681 KB savings availableFIX
~681.1 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 197 resources | 4.9 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CImage OptimizationAction74 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 Loading18 fonts (526 KB)PASS
Web fonts
18
526 KB total
Render-blocking
0
of 18
Dominant font-display
swap
Most common across fonts
Font loading timeline
- 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 ~27 KB and ~54 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource Hints22 hints, 0 missing preconnectsPASS
Current Resource Hints
22 resource hints configured
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall197 requests over 5538msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.walesonline.co.uk www.walesonline.co.uk | Other | 2160ms | 86 KB | — | £22/mo | Costly |
Unattributable Unattributable | Other | 997ms | 0 KB | — | £10/mo | Costly |
www.walesonline.co.uk www.walesonline.co.uk | Other | 825ms | 45 KB | 45% | £9/mo | Costly |
cmp.inmobi.com cmp.inmobi.com | Other | 500ms | 125 KB | 48% | £5/mo | Costly |
cmp.inmobi.com cmp.inmobi.com | Other | 465ms | 134 KB | 52% | £5/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 329ms | 168 KB | 42% | £3/mo | Costly |
feliz-web.data.tm-awx.com feliz-web.data.tm-awx.com | Other | 303ms | 7 KB | — | £3/mo | Costly |
www.walesonline.co.uk www.walesonline.co.uk | Other | 281ms | 58 KB | 36% | £3/mo | Costly |
scripts.webcontentassessor.com scripts.webcontentassessor.com | Other | 227ms | 152 KB | — | £2/mo | Costly |
s2-prod.walesonline.co.uk s2-prod.walesonline.co.uk | Other | 212ms | 133 KB | 60% | £2/mo | Costly |
securepubads.g.doubleclick.net securepubads.g.doubleclick.net | Other | 209ms | 188 KB | 76% | £2/mo | Costly |
cdn.eu.amplitude.com cdn.eu.amplitude.com | Other | 194ms | 50 KB | 64% | £2/mo | Optional |
www.walesonline.co.uk www.walesonline.co.uk | Other | 163ms | 32 KB | — | £2/mo | Optional |
www.walesonline.co.uk www.walesonline.co.uk | Other | 129ms | 13 KB | — | £1/mo | Optional |
Amplitude cdn.amplitude.com | Analytics | 108ms | 80 KB | 84% | £1/mo | Optional |
www.walesonline.co.uk www.walesonline.co.uk | Other | 94ms | 36 KB | 68% | £1/mo | Optional |
securepubads.g.doubleclick.net securepubads.g.doubleclick.net | Other | 72ms | 34 KB | — | £1/mo | Optional |
Amplitude cdn.amplitude.com | Analytics | 59ms | 55 KB | 53% | £1/mo | Optional |
premium.express.co.uk premium.express.co.uk | Other | 50ms | 30 KB | — | £1/mo | Optional |
These scripts may cost more than they're worth
- www.walesonline.co.uk adds 2160ms and costs ~£22/month
- Unattributable adds 997ms and costs ~£10/month
- www.walesonline.co.uk adds 825ms and costs ~£9/month
- cmp.inmobi.com adds 500ms and costs ~£5/month
- cmp.inmobi.com adds 465ms and costs ~£5/month
- Google Tag Manager adds 329ms and costs ~£3/month
- feliz-web.data.tm-awx.com adds 303ms and costs ~£3/month
- www.walesonline.co.uk adds 281ms and costs ~£3/month
- scripts.webcontentassessor.com adds 227ms and costs ~£2/month
- s2-prod.walesonline.co.uk adds 212ms and costs ~£2/month
- securepubads.g.doubleclick.net adds 209ms 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.walesonline.co.uk takes 2160ms 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 997ms 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
www.walesonline.co.uk takes 825ms 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
cmp.inmobi.com takes 500ms 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
cmp.inmobi.com takes 465ms 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
52% of cmp.inmobi.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
Google Tag Manager takes 329ms 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
feliz-web.data.tm-awx.com takes 303ms 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
www.walesonline.co.uk takes 281ms 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
scripts.webcontentassessor.com takes 227ms 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
s2-prod.walesonline.co.uk takes 212ms 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
60% of s2-prod.walesonline.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
securepubads.g.doubleclick.net takes 209ms 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
76% 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
64% of cdn.eu.amplitude.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
84% 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
68% of www.walesonline.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
53% 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