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.
4.23 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
18.66 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
1.75 s
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.031
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
6.52 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.
22.11 s
Page Load Progression
FPage Weight BudgetAction2.9 MB transferred, 97 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
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
FJS Execution CostAction5224ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.independent.co.uk/_build/react-archipelago.76481b736cee80b1ae3a.js | 1339ms | 1139ms | 23ms | 3rd |
| Unattributable | 480ms | 22ms | 0ms | 3rd |
| https://cmpv2.independent.co.uk/Notice.8f529.js | 351ms | 258ms | 24ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-5XT7NPD | 337ms | 294ms | 38ms | 3rd |
| https://cdn.taboola.com/libtrc/eslmedia-theindependent/loader.js | 306ms | 173ms | 132ms | 3rd |
| https://5d79bce7-5d2b-427e-a6c4-b89b6c7bf048.edge.permutive.app/8a36876c-0af1-446c-b4da-51399e9ee198-web.js | 283ms | 185ms | 97ms | 3rd |
| https://script.crazyegg.com/pages/versioned/common-scripts/8bd952a5f71d37cdd1817ea41856b9fa.js | 244ms | 217ms | 11ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-PZJCN8L90Z&cx=c>m=4e64e1 | 223ms | 183ms | 38ms | 3rd |
| https://www.independent.co.uk/ | 214ms | 43ms | 5ms | 3rd |
| https://www.independent.co.uk/_build/main.f97c6876f1a35ba7d84b.js | 205ms | 182ms | 16ms | 3rd |
Showing top 10 of 20 scripts
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 | 142 KB (76%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-PZJCN8L90Z | 152 KB | 108 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=4e64e1 | 152 KB | 63 KB (41%) | ✓ | 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 InventoryAction97 resources · 2.9 MB · 1.1 MB savings availableFIX
~1.1 MiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 97 resources | 2.9 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization18 images, 0 KB saveableREVIEW
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 Loading7 fonts (214 KB)PASS
Web fonts
7
214 KB total
Render-blocking
0
of 7
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 Hints7 hints, 0 missing preconnectsPASS
Current Resource Hints
7 resource hints configured
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall97 requests over 4057msINFO
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 | 1339ms | 93 KB | 31% | £20/mo | Costly |
Unattributable Unattributable | Other | 480ms | 0 KB | — | £7/mo | Costly |
cmpv2.independent.co.uk cmpv2.independent.co.uk | Other | 351ms | 91 KB | 68% | £5/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 337ms | 168 KB | 45% | £5/mo | Costly |
cdn.taboola.com cdn.taboola.com | Other | 306ms | 343 KB | 56% | £5/mo | Costly |
5d79bce7-5d2b-427e-a6c4-b89b6c7bf048.edge.permutive.app 5d79bce7-5d2b-427e-a6c4-b89b6c7bf048.edge.permutive.app | Other | 283ms | 263 KB | 16% | £4/mo | Costly |
script.crazyegg.com script.crazyegg.com | Other | 244ms | 51 KB | 48% | £4/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 223ms | 152 KB | 41% | £3/mo | Costly |
www.independent.co.uk www.independent.co.uk | Other | 214ms | 67 KB | — | £3/mo | Costly |
www.independent.co.uk www.independent.co.uk | Other | 205ms | 57 KB | 59% | £3/mo | Costly |
www.independent.co.uk www.independent.co.uk | Other | 193ms | 134 KB | 61% | £3/mo | Optional |
cdn-piano.independent.co.uk cdn-piano.independent.co.uk | Other | 178ms | 132 KB | 71% | £3/mo | Optional |
cmpv2.independent.co.uk cmpv2.independent.co.uk | Other | 176ms | 42 KB | — | £3/mo | Optional |
pm-widget.taboola.com pm-widget.taboola.com | Other | 155ms | 24 KB | — | £2/mo | Optional |
securepubads.g.doubleclick.net securepubads.g.doubleclick.net | Other | 150ms | 186 KB | 76% | £2/mo | Optional |
static.chartbeat.com static.chartbeat.com | Other | 103ms | 25 KB | — | £2/mo | Optional |
ats-wrapper.privacymanager.io ats-wrapper.privacymanager.io | Other | 97ms | 75 KB | 54% | £1/mo | Optional |
securepubads.g.doubleclick.net securepubads.g.doubleclick.net | Other | 75ms | 34 KB | — | £1/mo | Optional |
pub.doubleverify.com pub.doubleverify.com | Other | 61ms | 23 KB | — | £1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 53ms | 152 KB | 71% | £1/mo | Optional |
These scripts may cost more than they're worth
- www.independent.co.uk adds 1339ms and costs ~£20/month
- Unattributable adds 480ms and costs ~£7/month
- cmpv2.independent.co.uk adds 351ms and costs ~£5/month
- Google Tag Manager adds 337ms and costs ~£5/month
- cdn.taboola.com adds 306ms and costs ~£5/month
- 5d79bce7-5d2b-427e-a6c4-b89b6c7bf048.edge.permutive.app adds 283ms and costs ~£4/month
- script.crazyegg.com adds 244ms and costs ~£4/month
- Google Tag Manager adds 223ms and costs ~£3/month
- www.independent.co.uk adds 214ms and costs ~£3/month
- www.independent.co.uk adds 205ms and costs ~£3/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 1339ms 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 480ms 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
cmpv2.independent.co.uk takes 351ms 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
Google Tag Manager takes 337ms 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.taboola.com takes 306ms 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
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
5d79bce7-5d2b-427e-a6c4-b89b6c7bf048.edge.permutive.app takes 283ms 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
script.crazyegg.com takes 244ms 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 223ms 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.independent.co.uk takes 214ms 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.independent.co.uk takes 205ms 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
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
61% 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
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
54% of ats-wrapper.privacymanager.io'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 Google Tag Manager'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