Performance
· 28 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.
5.00 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
7.39 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
0 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.311
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
5.00 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.
7.40 s
Page Load Progression
BThird-Party Impact55% third-party, 0 ms blockingREVIEW
CImage OptimizationAction11 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.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
BJS Execution Cost999ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.veenendaal.nl/ | 569ms | 4ms | 1ms | 1st |
| Unattributable | 273ms | 16ms | 0ms | 1st |
| https://chatwidget-prod.web.app/embed/init.iife.js | 107ms | 69ms | 0ms | 3rd |
| https://veenendaal.analytics.opengemeenten.nl/matomo.js | 50ms | 44ms | 6ms | 3rd |
BHTTP/3 (QUIC)HTTP/3 not advertisedREVIEW
BDocument CompressionDocument response uses gzip; brotli would be ~20% smallerREVIEW
BServer-Timing ObservabilityNo Server-Timing header foundREVIEW
BHTTP Cachingno-cacheREVIEW
no-cache
| Directive | Value | Meaning |
|---|---|---|
| no-cache | — | Cache but always revalidate first |
APage Weight Budget841 KB transferred, 88 requestsPASS
A+Text CompressionAll text resources are compressedPASS
A+Font Loading4 fonts (84 KB)PASS
Web fonts
4
84 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+JS Bundles15 scripts, 36 KB unusedPASS
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://veenendaal.analytics.opengemeenten.nl/matomo.js | 67 KB | 36 KB (54%) | ✓ | 3rd |
| https://www.veenendaal.nl/_assets/317130fbcbb12622b6e28e3bfff3cb16/Js/OpenGemeentenSite-Focusable.min.js?1794362620 | 0 KB | — | ✓ | 1st |
| https://www.veenendaal.nl/_assets/317130fbcbb12622b6e28e3bfff3cb16/Js/OpenGemeentenSite-Media.min.js?1794362620 | 2 KB | — | ✓ | 1st |
| https://www.veenendaal.nl/_assets/6c3bf359f8df9d9222347f37e2814501/JavaScript/OpenGemeentenSiteSearch-PageHeader-Search.min.js?1794362620 | 1 KB | — | ✓ | 1st |
| https://www.veenendaal.nl/_assets/6c3bf359f8df9d9222347f37e2814501/JavaScript/OpenGemeentenSiteSearch-Suggest.min.js?1794362620 | 2 KB | — | ✓ | 1st |
| https://www.veenendaal.nl/_assets/f52859db1e4f013bae2a279b52772e55/Js/OpenGemeentenCeFeatureCollapsible.min.js?1794362619 | 2 KB | — | ✓ | 1st |
| https://chatwidget-prod.web.app/embed/init.iife.js | 11 KB | — | ✓ | 3rd |
| https://www.veenendaal.nl/_assets/317130fbcbb12622b6e28e3bfff3cb16/Js/OpenGemeentenSite-FragmentScroll.min.js?1794362620 | 1 KB | — | ✓ | 1st |
| https://www.veenendaal.nl/typo3temp/assets/js/f0b76d785ab1c527c0e58b0707e81585.js?1794364423 | 1 KB | — | ✓ | 1st |
| https://www.veenendaal.nl/_assets/317130fbcbb12622b6e28e3bfff3cb16/Js/OpenGemeentenSite-PageHeader-Collapsible.min.js?1794362620 | 1 KB | — | ✓ | 1st |
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
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+LCP Image PreloadLCP preload audit not availablePASS
A+Main HTML Cache-ControlMain HTML uses no-cache -- safe revalidate-on-request policyPASS
A+Server Response Intelligence2 server-response signal(s) detectedPASS
APage Weight Inventory88 resources · 841 KB · 36 KB savings availablePASS
~36.3 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 88 resources | 840.6 KiB | ||||||
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
AJavaScript Blocking1 JS blocking issue(s) detectedPASS
ACSS Performance Depth1 CSS depth issue(s) detectedPASS
A+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
This site is hosted on green energy infrastructure
Provider: Leaseweb Global BV
Asset CompressionNo text asset hosts to measureINFO
Network Waterfall88 requests over 1642msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
chatwidget-prod.web.app chatwidget-prod.web.app | Other | 107ms | 11 KB | — | €1/mo | Optional |
veenendaal.analytics.opengemeenten.nl veenendaal.analytics.opengemeenten.nl | Other | 50ms | 67 KB | 54% | €1/mo | Optional |
54% of veenendaal.analytics.opengemeenten.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
Real-User Performance (CrUX)Field metrics from the Chrome User Experience ReportINFO
Chrome User Experience (CrUX)
Real-user metrics from the Chrome UX Report (2026-10-14 — 2026-11-10)
LCP (p75)
939 ms
97% good
INP (p75)
67 ms
99% good
CLS (p75)
0.000
97% good
FCP (p75)
893 ms
TTFB (p75)
441 ms
Image Optimization6 images, 195 KB total, 0 KB wastedINFO
Image Optimization Audit
Total Images
6
Total Size
195 KB