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.
2.08 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
11.48 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
1.89 s
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.539
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
9.32 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.
25.92 s
Page Load Progression
FPage Weight BudgetAction4.1 MB transferred, 82 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
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
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
FJS Execution CostAction6732ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.vogue.co.uk/verso/static/2880.865952f35702ddfb7152.js | 1472ms | 1137ms | 101ms | 3rd |
| https://www.vogue.co.uk/verso/static/presenter-bundles.d7384530fdc10d8b1f48.js | 1223ms | 1190ms | 8ms | 3rd |
| https://www.vogue.co.uk/ | 806ms | 37ms | 92ms | 3rd |
| Unattributable | 619ms | 20ms | 0ms | 3rd |
| https://privacy.condenastdigital.com/fides.js?property_id=FDS-SHJ1MQ | 510ms | 316ms | 164ms | 3rd |
| https://www.vogue.co.uk/verso/static/1113.e5d6201548a2ec9583d0.js | 447ms | 223ms | 177ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-KG7M3XB&l=dataLayer | 395ms | 343ms | 46ms | 3rd |
| https://www.vogue.co.uk/L7Ma6PQHzyeZO9f0Amb4VgtWE0utMCJNj-vcVUDsgrdjGY2qTlJZgs1ePJLW0hT0toLQaXosLArSPfJr6bJulvsLBdiJX0PWuXrl7nolX-PFuB8Xa3H_0yYrohEyD-06SFvA | 311ms | 261ms | 18ms | 3rd |
| https://www.vogue.co.uk/iVJdG3PnpaNvzEgZfKXxkQwGIOPaOJ2qzsiBisr1EWjJT0imk25hdtyqGYUbuDdCvcd-2_sMv2gPLe7JunCmwCprrorvdszT7HI1fXvGJiiL6aPirBF1RoZGw29ioWAMRUADEj6PrR7jxC4Q | 211ms | 202ms | 2ms | 3rd |
| https://cdn.gladly.com/assets/chat-sdk/apiBootstrap~2cfce1229b40af21.js | 158ms | 144ms | 13ms | 3rd |
Showing top 10 of 15 scripts
FJS BundlesAction38 scripts, 1.1 MB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.vogue.co.uk/verso/static/1113.e5d6201548a2ec9583d0.js | 481 KB | 243 KB (51%) | ✓ | 3rd |
| https://www.vogue.co.uk/verso/static/2880.865952f35702ddfb7152.js | 329 KB | 167 KB (51%) | ✓ | 3rd |
| https://www.vogue.co.uk/verso/static/2519.8a55e989ba5af70e92d1.js | 305 KB | 146 KB (48%) | ✓ | 3rd |
| https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604160201/pubads_impl.js | 188 KB | 144 KB (77%) | ✓ | 3rd |
| https://www.vogue.co.uk/verso/static/1292.40f59c87ae47d8b12033.js | 156 KB | 117 KB (75%) | ✓ | 3rd |
| https://martech.condenastdigital.com/lib/martech.js | 118 KB | 76 KB (65%) | ✗ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-KG7M3XB&l=dataLayer | 187 KB | 74 KB (40%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-KSK3JJ9>m=4e64h1 | 131 KB | 57 KB (43%) | ✓ | 3rd |
| https://ads-static.conde.digital/production/cns/builds/vogue-uk/v6.js?v=12572 | 41 KB | 32 KB (79%) | ✓ | 3rd |
| https://cdn.gladly.com/assets/chat-sdk/vendor-node_modules_reduxjs_toolkit_dist_redux-toolkit_cjs_production_min_js-node_modules_bow-b52086~3b4ca15b1a4587be.js | 47 KB | 25 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 InventoryAction82 resources · 4.1 MB · 1.1 MB savings availableFIX
~1.1 MiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 82 resources | 4.1 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CImage OptimizationAction28 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
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
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.
Performance issues directly impact user engagement and conversion rates.
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
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
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
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
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
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
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
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
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
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 Loading4 fonts (175 KB)PASS
Web fonts
4
175 KB total
Render-blocking
0
of 4
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 Hints2 hints, 0 missing preconnectsPASS
Current Resource Hints
2 resource hints configured
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall82 requests over 4863msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.vogue.co.uk www.vogue.co.uk | Other | 1472ms | 329 KB | 51% | £22/mo | Costly |
www.vogue.co.uk www.vogue.co.uk | Other | 1223ms | 34 KB | — | £18/mo | Costly |
www.vogue.co.uk www.vogue.co.uk | Other | 806ms | 99 KB | — | £12/mo | Costly |
Unattributable Unattributable | Other | 619ms | 0 KB | — | £9/mo | Costly |
privacy.condenastdigital.com privacy.condenastdigital.com | Other | 510ms | 199 KB | — | £8/mo | Costly |
www.vogue.co.uk www.vogue.co.uk | Other | 447ms | 481 KB | 51% | £7/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 395ms | 187 KB | 40% | £6/mo | Costly |
www.vogue.co.uk www.vogue.co.uk | Other | 311ms | 51 KB | — | £5/mo | Costly |
www.vogue.co.uk www.vogue.co.uk | Other | 211ms | 9 KB | — | £3/mo | Costly |
cdn.gladly.com cdn.gladly.com | Other | 158ms | 44 KB | 56% | £2/mo | Optional |
securepubads.g.doubleclick.net securepubads.g.doubleclick.net | Other | 152ms | 188 KB | 77% | £2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 139ms | 131 KB | 43% | £2/mo | Optional |
www.vogue.co.uk www.vogue.co.uk | Other | 119ms | 156 KB | 75% | £2/mo | Optional |
www.vogue.co.uk www.vogue.co.uk | Other | 115ms | 305 KB | 48% | £2/mo | Optional |
securepubads.g.doubleclick.net securepubads.g.doubleclick.net | Other | 56ms | 34 KB | — | £1/mo | Optional |
These scripts may cost more than they're worth
- www.vogue.co.uk adds 1472ms and costs ~£22/month
- www.vogue.co.uk adds 1223ms and costs ~£18/month
- www.vogue.co.uk adds 806ms and costs ~£12/month
- Unattributable adds 619ms and costs ~£9/month
- privacy.condenastdigital.com adds 510ms and costs ~£8/month
- www.vogue.co.uk adds 447ms and costs ~£7/month
- Google Tag Manager adds 395ms and costs ~£6/month
- www.vogue.co.uk adds 311ms and costs ~£5/month
- www.vogue.co.uk adds 211ms 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.vogue.co.uk takes 1472ms 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
51% of www.vogue.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
www.vogue.co.uk takes 1223ms 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.vogue.co.uk takes 806ms 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 619ms 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
privacy.condenastdigital.com takes 510ms 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.vogue.co.uk takes 447ms 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
51% of www.vogue.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 395ms 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.vogue.co.uk takes 311ms 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.vogue.co.uk takes 211ms 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.gladly.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
77% 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
75% of www.vogue.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