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.
1.94 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
2.59 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
147 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.
3.06 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.
4.01 s
Page Load Progression
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
FJS BundlesAction25 scripts, 516 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://atlas.hostnet.nl/dist/main.3173b01b79121d42.js | 169 KB | 104 KB (62%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/destination?id=AW-989190296&cx=c>m=4e64h1&sign=3b5af2733d09fb7a9d33765f39f70912b01c9a646322f62f8c3526a0f38abc01_20260421 | 144 KB | 71 KB (49%) | ✓ | 3rd |
| https://sst.hostnet.nl/gtm.js?id=GTM-MLV5BR | 172 KB | 63 KB (37%) | ✓ | 3rd |
| https://sst.hostnet.nl/gtag/js?id=G-EH230HZ7S3&cx=c>m=4e64h1&sign=3b5af2733d09fb7a9d33765f39f70912b01c9a646322f62f8c3526a0f38abc01_20260421 | 171 KB | 63 KB (37%) | ✓ | 3rd |
| https://atlas.hostnet.nl/dist/6635.92b49d711f2a94b3.js | 95 KB | 49 KB (52%) | ✓ | 3rd |
| https://consent.cookiebot.eu/389e47f8-135c-499a-b183-250847368146/cc.js?renew=false&referer=www.hostnet.nl&dnt=false&init=false | 84 KB | 31 KB (37%) | ✓ | 3rd |
| https://www.hostnet.nl/dist/website-builder-trial.js?1776780076 | 30 KB | 30 KB (100%) | ✓ | 3rd |
| https://www.hostnet.nl/dist/customer-notice.js?1776780076 | 30 KB | 30 KB (98%) | ✓ | 3rd |
| https://www.hostnet.nl/dist/collapsable-content.js?1776780076 | 30 KB | 30 KB (99%) | ✓ | 3rd |
| https://www.hostnet.nl/dist/swiper.js?1776780076 | 38 KB | 24 KB (65%) | ✓ | 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 InventoryAction80 resources · 1.9 MB · 516 KB savings availableFIX
~516.3 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 80 resources | 1.9 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CPage Weight BudgetAction1.9 MB transferred, 80 requestsREVIEW
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
BImage Optimization21 images, 0 KB saveableREVIEW
CJS Execution CostAction1236ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://atlas.hostnet.nl/dist/polyfills.fde6327d4e2d9862.js | 344ms | 228ms | 3ms | 3rd |
| https://www.hostnet.nl/ | 329ms | 29ms | 3ms | 3rd |
| Unattributable | 213ms | 5ms | 0ms | 3rd |
| https://atlas.hostnet.nl/dist/main.3173b01b79121d42.js | 136ms | 116ms | 18ms | 3rd |
| https://sst.hostnet.nl/gtag/js?id=G-EH230HZ7S3&cx=c>m=4e64h1&sign=3b5af2733d09fb7a9d33765f39f70912b01c9a646322f62f8c3526a0f38abc01_20260421 | 103ms | 87ms | 15ms | 3rd |
| https://www.hostnet.nl/dist/core.js?1776780076 | 59ms | 46ms | 4ms | 3rd |
| https://www.googletagmanager.com/gtag/destination?id=AW-989190296&cx=c>m=4e64h1&sign=3b5af2733d09fb7a9d33765f39f70912b01c9a646322f62f8c3526a0f38abc01_20260421 | 53ms | 42ms | 10ms | 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 (195 KB)PASS
Web fonts
3
195 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 Waterfall80 requests over 4228msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
atlas.hostnet.nl atlas.hostnet.nl | Other | 344ms | 25 KB | — | €2/mo | Costly |
www.hostnet.nl www.hostnet.nl | Other | 329ms | 31 KB | — | €2/mo | Costly |
Unattributable Unattributable | Other | 213ms | 0 KB | — | €1/mo | Costly |
atlas.hostnet.nl atlas.hostnet.nl | Other | 136ms | 169 KB | 62% | €1/mo | Optional |
sst.hostnet.nl sst.hostnet.nl | Other | 103ms | 171 KB | 37% | €1/mo | Optional |
www.hostnet.nl www.hostnet.nl | Other | 59ms | 40 KB | 55% | €0/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 53ms | 144 KB | 49% | €0/mo | Optional |
These scripts may cost more than they're worth
- atlas.hostnet.nl adds 344ms and costs ~€2/month
- www.hostnet.nl adds 329ms and costs ~€2/month
- Unattributable adds 213ms and costs ~€1/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
atlas.hostnet.nl takes 344ms 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.hostnet.nl takes 329ms 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 213ms 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
62% of atlas.hostnet.nl'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
55% of www.hostnet.nl'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