Performance
· 15 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.
768 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
1.05 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
81 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.035
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
1.27 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.
4.41 s
Page Load Progression
FPage Weight BudgetAction3.0 MB transferred, 103 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
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 BundlesAction40 scripts, 1.1 MB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://cdn.taboola.com/libtrc/eslmedia-theindependent/loader.js | 343 KB | 193 KB (56%) | ✓ | 3rd |
| https://www.independent.co.uk/Agent/GA/UniversalID/IIQUniversalID.js | 166 KB | 143 KB (86%) | ✓ | 3rd |
| https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604100101/pubads_impl.js | 186 KB | 140 KB (75%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-PZJCN8L90Z | 152 KB | 107 KB (71%) | ✓ | 3rd |
| https://cdn-piano.independent.co.uk/api/tinypass.min.js | 132 KB | 94 KB (71%) | ✓ | 3rd |
| https://www.independent.co.uk/_build/react-components-base.aa9fd055ff81dc977eb8.js | 134 KB | 81 KB (61%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-5XT7NPD | 168 KB | 75 KB (45%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-PZJCN8L90Z&cx=c>m=4e64f0h2&bs=ctrl | 152 KB | 63 KB (42%) | ✓ | 3rd |
| https://cmpv2.independent.co.uk/Notice.8f529.js | 91 KB | 61 KB (68%) | ✓ | 3rd |
| https://5d79bce7-5d2b-427e-a6c4-b89b6c7bf048.edge.permutive.app/8a36876c-0af1-446c-b4da-51399e9ee198-web.js | 263 KB | 43 KB (16%) | ✓ | 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 InventoryAction103 resources · 3.0 MB · 1.1 MB savings availableFIX
~1.1 MiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 103 resources | 3.0 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization21 images, 0 KB saveableREVIEW
CJS Execution CostAction1289ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.independent.co.uk/_build/react-archipelago.76481b736cee80b1ae3a.js | 362ms | 340ms | 9ms | 3rd |
| Unattributable | 135ms | 5ms | 0ms | 3rd |
| https://www.independent.co.uk/ | 104ms | 13ms | 1ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-5XT7NPD | 97ms | 85ms | 10ms | 3rd |
| https://cmpv2.independent.co.uk/Notice.8f529.js | 80ms | 64ms | 6ms | 3rd |
| https://5d79bce7-5d2b-427e-a6c4-b89b6c7bf048.edge.permutive.app/8a36876c-0af1-446c-b4da-51399e9ee198-web.js | 72ms | 47ms | 24ms | 3rd |
| https://script.crazyegg.com/pages/versioned/common-scripts/8bd952a5f71d37cdd1817ea41856b9fa.js | 70ms | 62ms | 3ms | 3rd |
| https://cdn.taboola.com/libtrc/eslmedia-theindependent/loader.js | 69ms | 37ms | 31ms | 3rd |
| https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604100101/pubads_impl.js | 64ms | 40ms | 10ms | 3rd |
| https://cmpv2.independent.co.uk/unified/wrapperMessagingWithoutDetection.js | 63ms | 44ms | 3ms | 3rd |
Showing top 10 of 13 scripts
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 Loading8 fonts (245 KB)PASS
Web fonts
8
245 KB total
Render-blocking
0
of 8
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 HintsNo optimization neededPASS
Network Waterfall103 requests over 3486msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.independent.co.uk www.independent.co.uk | Other | 362ms | 94 KB | 31% | £5/mo | Costly |
Unattributable Unattributable | Other | 135ms | 0 KB | — | £2/mo | Optional |
www.independent.co.uk www.independent.co.uk | Other | 104ms | 67 KB | — | £2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 97ms | 168 KB | 45% | £1/mo | Optional |
cmpv2.independent.co.uk cmpv2.independent.co.uk | Other | 80ms | 91 KB | 68% | £1/mo | Optional |
5d79bce7-5d2b-427e-a6c4-b89b6c7bf048.edge.permutive.app 5d79bce7-5d2b-427e-a6c4-b89b6c7bf048.edge.permutive.app | Other | 72ms | 263 KB | 16% | £1/mo | Optional |
script.crazyegg.com script.crazyegg.com | Other | 70ms | 51 KB | 48% | £1/mo | Optional |
cdn.taboola.com cdn.taboola.com | Other | 69ms | 343 KB | 56% | £1/mo | Optional |
securepubads.g.doubleclick.net securepubads.g.doubleclick.net | Other | 64ms | 186 KB | 75% | £1/mo | Optional |
cmpv2.independent.co.uk cmpv2.independent.co.uk | Other | 63ms | 42 KB | — | £1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 59ms | 152 KB | 42% | £1/mo | Optional |
www.independent.co.uk www.independent.co.uk | Other | 58ms | 57 KB | 59% | £1/mo | Optional |
cdn-piano.independent.co.uk cdn-piano.independent.co.uk | Other | 54ms | 132 KB | 71% | £1/mo | Optional |
These scripts may cost more than they're worth
- www.independent.co.uk adds 362ms and costs ~£5/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.independent.co.uk takes 362ms 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 cmpv2.independent.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
56% of cdn.taboola.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
75% 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
59% of www.independent.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
71% of cdn-piano.independent.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