https://haarlemmermeergemeente.nl
Performance
· 28 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.SCORE
85
GRADE
B
FIX
3
REVIEW
7
PASS
13
INFO
5
Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
55
100
100
100
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
2.29 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
7.57 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
738 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.
3.01 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.
9.59 s
Page Load Progression
Checks
2813 PASS 7 REVIEW 3 FIX
DJS Execution CostAction3360ms total JS executionFIX
JS Execution Cost
Action3360ms total JS execution
3360ms total JS execution
Warning::
https://haarlemmermeergemeente.nl/_next/static/chu...: 1367ms CPU time
Warning::
https://haarlemmermeergemeente.nl/_next/static/chu...: 751ms CPU time
Warning::
https://haarlemmermeergemeente.nl/: 410ms CPU time
Warning::
Unattributable: 361ms CPU time
Info::
https://haarlemmermeergemeente.nl/_next/static/chu...: 152ms CPU time
Info::
Third-party scripts: 319ms (9% of total)
Main Thread Breakdown
Script Evaluation 66% Other 12% Script Parsing & Compilation 9% Style & Layout 8%
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://haarlemmermeergemeente.nl/_next/static/chunks/framework-cfa9730c0b361aa8.js | 1367ms | 1228ms | 13ms | 1st |
| https://haarlemmermeergemeente.nl/_next/static/chunks/pages/_app-147da3600acbd0f8.js | 751ms | 570ms | 180ms | 1st |
| https://haarlemmermeergemeente.nl/ | 410ms | 37ms | 4ms | 1st |
| Unattributable | 361ms | 13ms | 0ms | 1st |
| https://haarlemmermeergemeente.nl/_next/static/chunks/main-4fbe98809c211867.js | 152ms | 137ms | 13ms | 1st |
| https://siteimproveanalytics.com/js/siteanalyze_6006057.js | 117ms | 70ms | 45ms | 3rd |
| https://haarlemmermeer1.expoints.nl/m/Scripts/dist/expoints-external.min.js?lv=1 | 109ms | 83ms | 21ms | 3rd |
| https://ajax.googleapis.com/ajax/libs/jquery/3.6.0/jquery.min.js | 93ms | 79ms | 9ms | 3rd |
DJS BundlesAction20 scripts, 403 KB unusedFIX
JS Bundles
Action20 scripts, 403 KB unused
20 scripts, 403 KB unused
Warning::
https://haarlemmermeergemeente.nl/_next/static/chu...: 279 KB unused (62%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://siteimproveanalytics.com/js/siteanalyze_60...: 78 KB unused (70%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://haarlemmermeer1.expoints.nl/m/Scripts/dist...: 25 KB unused (68%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://static.mailplus.nl/jq/jquery.validate.1.19...: 20 KB unused (84%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 403 KB
403 KB unused JavaScript
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://haarlemmermeergemeente.nl/_next/static/chunks/pages/_app-147da3600acbd0f8.js | 450 KB | 279 KB (62%) | ✓ | 1st |
| https://siteimproveanalytics.com/js/siteanalyze_6006057.js | 112 KB | 78 KB (70%) | ✓ | 3rd |
| https://haarlemmermeer1.expoints.nl/m/Scripts/dist/expoints-external.min.js?lv=1 | 37 KB | 25 KB (68%) | ✓ | 3rd |
| https://static.mailplus.nl/jq/jquery.validate.1.19.3.min.js | 24 KB | 20 KB (84%) | ✓ | 3rd |
| https://ajax.googleapis.com/ajax/libs/jquery/3.6.0/jquery.min.js | 31 KB | — | ✓ | 3rd |
| https://haarlemmermeergemeente.nl/_next/static/chunks/main-4fbe98809c211867.js | 44 KB | — | ✓ | 1st |
| https://haarlemmermeergemeente.nl/_next/static/chunks/86513-cc0889b9865a192f.js | 5 KB | — | ✓ | 1st |
| https://haarlemmermeergemeente.nl/_next/static/chunks/pages/index-090c47fe6f1f6390.js | 2 KB | — | ✓ | 1st |
| https://haarlemmermeergemeente.nl/_next/static/2eb89e06/_buildManifest.js | 1 KB | — | ✓ | 1st |
| https://haarlemmermeergemeente.nl/_next/static/chunks/webpack-ffb387e711e5bb7b.js | 19 KB | — | ✓ | 1st |
Consider code splitting or tree shaking to reduce unused code.
Why this matters
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.
Why this matters
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.
Why this matters
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.
Why this matters
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
DHTTP CachingActionno-store (uncacheable)FIX
HTTP Caching
Actionno-store (uncacheable)
no-store (uncacheable)
Info::
Cache-Control: no-store prevents all caching
Intentional for dynamic content, but increases server load for every page view.
Got: no-store
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control
no-store
| Directive | Value | Meaning |
|---|---|---|
| no-store | — | Never cache this response |
BPage Weight Budget1.3 MB transferred, 40 requestsREVIEW
Page Weight Budget
1.3 MB transferred, 40 requests
1.3 MB transferred, 40 requests
Info::
Page weighs 3.9 MB (1.3 MB transferred)
Warning::
JavaScript is 805 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 805 KB
Info::
40 HTTP requests
Info::
Estimated 0.26 g CO2 per page load
1.3 MB transferred
40 requests
0.26 g CO2 per page load
JavaScript 804.6 KiB 62%
Images 220.8 KiB 17%
Fonts 198.6 KiB 15%
HTML 35.9 KiB 3%
Other 24.2 KiB 2%
Other 7.0 KiB 1%
CSS 1.0 KiB 0%
0 2.4 MB 4.9 MB
Under budget
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Why this matters
JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.
Source: web.dev
BImage Optimization8 images, 0 KB saveableREVIEW
Image Optimization
8 images, 0 KB saveable
8 images, 0 KB saveable
Warning::
https://haarlemmermeergemeente.nl/images/logo53568... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://haarlemmermeergemeente.nl/images/infor-mee... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
8 images 221 KB
0 oversized -0 KB
4 legacy format
2 missing dimensions CLS risk
Set explicit width and height to prevent CLS.
Why this matters
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.
Why this matters
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
BHTTP/3 (QUIC)HTTP/3 not advertisedREVIEW
HTTP/3 (QUIC)
HTTP/3 not advertised
HTTP/3 not advertised
Info::
HTTP/3 (QUIC) is not advertised
HTTP/3 isn't advertised via Alt-Svc and the worker didn't negotiate h3. HTTP/3 reduces handshake latency (1-RTT instead of 2-3 RTTs) and is more resilient on lossy connections. Most modern CDNs (Cloudflare, Fastly, AWS CloudFront, Google Cloud CDN) support HTTP/3 with a single config switch -- consider enabling for mobile-heavy workloads.
CDocument CompressionActionDocument response served uncompressedREVIEW
Document Compression
ActionDocument response served uncompressed
Document response served uncompressed
Info::
Main HTML response has no Content-Encoding (uncompressed)
The main HTML document is served without compression. The Text Compression section above lists the broader picture; for the main response specifically, even gzip would shave ~70-80% off most text payloads.
BServer-Timing ObservabilityNo Server-Timing header foundREVIEW
Server-Timing Observability
No Server-Timing header found
No Server-Timing header found
Info::
No Server-Timing header found
Server-Timing exposes backend timing breakdowns to browser DevTools (e.g., `db: 45ms; render: 120ms; cache: 2ms`). Useful for diagnosing slow pages without backend log access. Most modern frameworks (Next.js, Cloudflare Workers, Fastly) emit it automatically; absence on a managed platform usually means telemetry headers are stripped at the edge.
CPage Weight InventoryAction40 resources · 1.3 MB · 403 KB savings availableREVIEW
Page Weight Inventory
Action40 resources · 1.3 MB · 403 KB savings available
40 resources · 1.3 MB · 403 KB savings available
Warning::
Page weight 1.3 MB exceeds 1 MB target by 268 KB
Got: 1.3 MB Expected: ≤ 1 MB
Info::
~403 KB of savings available
Info::
15 third-party resources (29% of weight)
Info::
1 resources over 200KB
40 resources · 1.3 MiB · 15 third-party 268.2 KiB over 1MB target
JavaScript 62% · 805.3 KiB
Image 18% · 227.1 KiB
Font 15% · 198.6 KiB
Document 3% · 35.9 KiB
Other 2% · 24.2 KiB
CSS 0% · 1.0 KiB
~402.5 KiB of savings available
Remove unused JavaScript: 402.5 KiB
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 40 resources | 1.3 MiB | ||||||
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
ActionWhether the site is served from green-energy infrastructure
Green Hosting
No green hosting detected
AThird-Party Impact29% third-party, 0 ms blockingPASS
Third-Party Impact
29% third-party, 0 ms blocking
29% third-party, 0 ms blocking
Info::
Third-party code accounts for 29% of page weight (368.4 KiB of 1.3 MiB)
Info::
Third-party blocking time is low (0 ms)
71%
29%
First-party Third-party
A+Text CompressionAll text resources are compressedPASS
Text Compression
All text resources are compressed
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+Font Loading4 fonts (199 KB)PASS
Font Loading
4 fonts (199 KB)
4 fonts (199 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
4
199 KB total
Render-blocking
0
of 4
Dominant font-display
swap
Most common across fonts
Font loading timeline
Transfer FOIT (block) FOUT (swap)
axiforma-40041f0f2625da... woff2 swap
Size 24 KB
Load time 44 ms
Start 116 ms
Risk FOUT — text flashes from fallback to web font
axiforma-60057102fa4138... woff2 swap
Size 25 KB
Load time 94 ms
Start 116 ms
Risk FOUT — text flashes from fallback to web font
axiforma-400-italiccd7a... woff2 swap
Size 27 KB
Load time 38 ms
Start 369 ms
Risk FOUT — text flashes from fallback to web font
Haarlemmermeer_Axiforma... ttf swap
Size 122 KB
Load time 115 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
- Convert to woff2 for ~30% smaller file size
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
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)
Fixing the unchecked items could save ~98 KB and ~196 ms
A+Resource CachingAll resources properly cachedPASS
Resource Caching
All resources properly cached
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+Critical Rendering PathNo render-blocking resourcesPASS
Critical Rendering Path
No render-blocking resources
No render-blocking resources
Info::
No render-blocking resources detected
A+Resource Hints4 hints, 0 missing preconnectsPASS
Resource Hints
4 hints, 0 missing preconnects
4 hints, 0 missing preconnects
Info::
Page uses 4 resource hint(s)
Current Resource Hints
preconnect—
preload 3
dns-prefetch—
prefetch 1
4 resource hints configured
A+LCP Image PreloadLCP preload audit not availablePASS
LCP Image Preload
LCP preload audit not available
LCP preload audit not available
Info::
LCP image preload audit not available for this scan
A+Main HTML Cache-ControlMain HTML uses no-store -- correct for sensitive/dynamic contentPASS
Main HTML Cache-Control
Main HTML uses no-store -- correct for sensitive/dynamic content
Main HTML uses no-store -- correct for sensitive/dynamic content
Info::
Main HTML uses no-store -- correct for sensitive/dynamic content
Got: no-store
A+Server Response Intelligence1 server-response signal(s) detectedPASS
Server Response Intelligence
1 server-response signal(s) detected
1 server-response signal(s) detected
Info::
No `ETag` or `Last-Modified` -- conditional GET not supported
Without either header, browsers can't issue conditional GETs and refresh always re-downloads the full response body even when nothing changed. Add `ETag: "<hash>"` (or `Last-Modified: <date>`) on cacheable responses; the server returns 304 Not Modified when the client's cached copy is still valid, saving bandwidth.
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
Render-Blocking Resources
No render-blocking resources detected
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+Third-Party ResourcesNo third-party resources detectedPASS
Third-Party Resources
No third-party resources detected
No third-party resources detected
AJavaScript Blocking1 JS blocking issue(s) detectedPASS
JavaScript Blocking
1 JS blocking issue(s) detected
1 JS blocking issue(s) detected
Warning::
3 render-blocking <script src> tag(s) without async/defer
Each `<script src=...>` without `async`, `defer`, or `type="module"` blocks HTML parsing while the browser fetches and executes it. The block lasts the entire round-trip + execution time -- on slow networks this translates directly into LCP delay. Add `defer` (executes after parse, in source order) for scripts that interact with the DOM, or `async` (executes whenever ready) for analytics / independent scripts. Module scripts (`type="module"`) are deferred by default.
A+CSS Performance DepthNo CSS performance depth issues detectedPASS
CSS Performance Depth
No CSS performance depth issues detected
No CSS performance depth issues detected
Info::
No CSS performance depth issues detected
Asset CompressionNo text asset hosts to measureINFO
Asset Compression
No text asset hosts to measure
No text asset hosts to measure
Info::
No third-party or subdomain host served enough text assets to measure
Asset compression is measured per host, from one HEAD request against a sampled resource. Pages that serve all their JS and CSS from the document's own origin are covered by the document compression check instead.
Network Waterfall40 requests over 1354msINFO
Network Waterfall
40 requests over 1354ms
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
9% of JavaScript execution is third-party
First-party Third-party 319ms · 180KB · €3/mo
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
siteimproveanalytics.com siteimproveanalytics.com | Other | 117ms | 112 KB | 70% | €1/mo | Optional |
haarlemmermeer1.expoints.nl haarlemmermeer1.expoints.nl | Other | 109ms | 37 KB | 68% | €1/mo | Optional |
ajax.googleapis.com ajax.googleapis.com | Other | 93ms | 31 KB | — | €1/mo | Optional |
siteimproveanalytics.com
Other
Execution 117ms
Transfer 112 KB
Unused 70%
Monthly Cost €1/mo
haarlemmermeer1.expoints.nl
Other
Execution 109ms
Transfer 37 KB
Unused 68%
Monthly Cost €1/mo
ajax.googleapis.com
Other
Execution 93ms
Transfer 31 KB
Monthly Cost €1/mo
70% of siteimproveanalytics.com's code is unused. The script may be loading features you don't use.
Why this matters
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
68% of haarlemmermeer1.expoints.nl's code is unused. The script may be loading features you don't use.
Why this matters
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
Real-User Performance (CrUX)
Field metrics from the Chrome User Experience Report
Chrome User Experience (CrUX)
Real-user metrics from the Chrome UX Report (2026-10-14 — 2026-11-10)
LCP (p75)
1176 ms
95% good
INP (p75)
93 ms
95% good
CLS (p75)
0.000
97% good
FCP (p75)
901 ms
TTFB (p75)
313 ms
This origin passes Core Web Vitals assessment
Image Optimization5 images, 345 KB total, 237 KB wastedINFO
Image Optimization
5 images, 345 KB total, 237 KB wasted
Image Optimization Audit
Total Images
5
Total Size
345 KB
Oversized
2
Wasted
237 KB
4 missing dimensions 3 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.