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.
1.05 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
5.22 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
25 ms
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.
2.46 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.
5.33 s
Page Load Progression
FPage Weight BudgetAction8.0 MB transferred, 82 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
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.
Source: web.dev
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
FJS BundlesAction36 scripts, 783 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.kantar.com/-/media/themes/kantar/global/core-libraries/scripts/optimized-min.js?t=20150515T071943:635672711833756301Z | 218 KB | 157 KB (73%) | ✓ | 3rd |
| https://www.kantar.com/-/media/themes/kantar/global/core-libraries/scripts/optimized-min.js?t=20150515T071943:635672711833756301Z | 218 KB | 157 KB (73%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/destination?id=AW-10778449071&cx=c>m=4e64k1 | 146 KB | 80 KB (55%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-PR5V98Q | 191 KB | 79 KB (41%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-10998979353&cx=c>m=4e64k1 | 145 KB | 64 KB (44%) | ✓ | 3rd |
| https://www.kantar.com/-/media/themes/kantar/global/kantarmain/kantar-search/scripts/optimized-min.js?t=20260409T091220Z | 67 KB | 49 KB (74%) | ✓ | 3rd |
| https://www.kantar.com/-/media/themes/kantar/global/kantarmain/kantar-search/scripts/optimized-min.js?t=20260409T091220Z | 67 KB | 49 KB (74%) | ✓ | 3rd |
| https://www.kantar.com/-/media/themes/kantar/global/kantarmain/scripts/optimized-min.js?t=20260409T091121Z | 99 KB | 48 KB (49%) | ✓ | 3rd |
| https://www.kantar.com/-/media/themes/kantar/global/kantarmain/scripts/optimized-min.js?t=20260409T091121Z | 99 KB | 48 KB (49%) | ✓ | 3rd |
| https://consent.cookiebot.com/uc.js?cbid=5e052ca0-c111-4ceb-86ce-5397a2b7f70d&implementation=gtm&consentmode-dataredaction=dynamic | 27 KB | 26 KB (97%) | ✓ | 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 · 8.0 MB · 783 KB savings availableFIX
~783.5 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 82 resources | 8.0 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization25 images, 0 KB saveableREVIEW
CJS Execution CostAction1028ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.kantar.com/ | 442ms | 2ms | 0ms | 3rd |
| https://consent.cookiebot.com/uc.js | 235ms | 154ms | 2ms | 3rd |
| Unattributable | 105ms | 5ms | 0ms | 3rd |
| https://www.kantar.com/-/media/themes/kantar/global/kantarmain/scripts/optimized-min.js?t=20260409T091121Z | 101ms | 44ms | 4ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-PR5V98Q | 87ms | 68ms | 13ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-10998979353&cx=c>m=4e64k1 | 59ms | 44ms | 9ms | 3rd |
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 Loading3 fonts (127 KB)PASS
Web fonts
3
127 KB total
Render-blocking
0
of 3
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 Waterfall82 requests over 1727msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.kantar.com www.kantar.com | Other | 442ms | 20 KB | — | $6/mo | Costly |
consent.cookiebot.com consent.cookiebot.com | Other | 235ms | 27 KB | — | $3/mo | Costly |
Unattributable Unattributable | Other | 105ms | 0 KB | — | $1/mo | Optional |
www.kantar.com www.kantar.com | Other | 101ms | 99 KB | 49% | $1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 87ms | 191 KB | 41% | $1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 59ms | 145 KB | 44% | $1/mo | Optional |
These scripts may cost more than they're worth
- www.kantar.com adds 442ms and costs ~$6/month
- consent.cookiebot.com adds 235ms 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.kantar.com takes 442ms 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
consent.cookiebot.com takes 235ms 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