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.
655 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
1.88 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
431 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.001
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
3.15 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.
3.99 s
Page Load Progression
FPage Weight BudgetAction6.4 MB transferred, 118 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
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
DJS Execution CostAction3183ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.tomtom.com/kenai/_next/static/chunks/0f0-1~eq5l.wi.js | 1051ms | 739ms | 13ms | 3rd |
| https://www.tomtom.com/kenai/_next/static/chunks/019bm2~23bpfm.js | 1025ms | 987ms | 10ms | 3rd |
| https://www.tomtom.com/ | 402ms | 84ms | 43ms | 3rd |
| Unattributable | 313ms | 6ms | 0ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-TFLCNKEXQ6 | 178ms | 135ms | 20ms | 3rd |
| https://tags.tiqcdn.com/utag/tomtom/tomtom/prod/utag.js | 84ms | 78ms | 2ms | 3rd |
| https://deploy.mopinion.com/js/pastease.js | 65ms | 56ms | 3ms | 3rd |
| https://scripts.clarity.ms/0.8.59/clarity.js | 65ms | 60ms | 3ms | 3rd |
FJS BundlesAction39 scripts, 697 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.tomtom.com/kenai/_next/static/chunks/08183s.pl3n.o.js | 336 KB | 262 KB (78%) | ✓ | 3rd |
| https://www.tomtom.com/kenai/_next/static/chunks/01pgawp0j2dku.js | 245 KB | 192 KB (78%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-TFLCNKEXQ6 | 165 KB | 63 KB (38%) | ✓ | 3rd |
| https://www.tomtom.com/kenai/_next/static/chunks/03u5n.oa6ihtr.js | 77 KB | 41 KB (54%) | ✓ | 3rd |
| https://www.tomtom.com/kenai/_next/static/chunks/0xl-yrao53gb9.js | 58 KB | 33 KB (57%) | ✓ | 3rd |
| https://collect.mopinion.com/assets/surveys/2.0/js/survey.min.js?v=18082023 | 58 KB | 30 KB (53%) | ✓ | 3rd |
| https://www.tomtom.com/kenai/_next/static/chunks/0f0-1~eq5l.wi.js | 82 KB | 28 KB (34%) | ✓ | 3rd |
| https://www.tomtom.com/kenai/_next/static/chunks/01.pycsztypfp.js | 264 KB | 27 KB (10%) | ✓ | 3rd |
| https://www.tomtom.com/kenai/_next/static/chunks/019bm2~23bpfm.js | 63 KB | 22 KB (35%) | ✓ | 3rd |
| https://www.tomtom.com/kenai/_next/static/chunks/09bo89rark9nm.js | 3 KB | — | ✓ | 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 InventoryAction118 resources · 6.4 MB · 697 KB savings availableFIX
~696.6 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 118 resources | 6.4 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization40 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 Loading5 fonts (138 KB)PASS
Web fonts
5
138 KB total
Render-blocking
0
of 5
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 Waterfall118 requests over 3745msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.tomtom.com www.tomtom.com | Other | 1051ms | 82 KB | 34% | €11/mo | Costly |
www.tomtom.com www.tomtom.com | Other | 1025ms | 63 KB | 35% | €11/mo | Costly |
www.tomtom.com www.tomtom.com | Other | 402ms | 52 KB | — | €4/mo | Costly |
Unattributable Unattributable | Other | 313ms | 0 KB | — | €3/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 178ms | 165 KB | 38% | €2/mo | Optional |
tags.tiqcdn.com tags.tiqcdn.com | Other | 84ms | 14 KB | — | €1/mo | Optional |
deploy.mopinion.com deploy.mopinion.com | Other | 65ms | 14 KB | — | €1/mo | Optional |
Microsoft Clarity scripts.clarity.ms | Session Replay | 65ms | 26 KB | — | €1/mo | Optional |
These scripts may cost more than they're worth
- www.tomtom.com adds 1051ms and costs ~€11/month
- www.tomtom.com adds 1025ms and costs ~€11/month
- www.tomtom.com adds 402ms and costs ~€4/month
- Unattributable adds 313ms 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.tomtom.com takes 1051ms 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.tomtom.com takes 1025ms 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.tomtom.com takes 402ms 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 313ms 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