https://www.bloemendaal.nl
Performance
· 27 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.SCORE
92
GRADE
A
FIX
0
REVIEW
6
PASS
18
INFO
3
Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
76
96
100
92
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
2.37 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
3.85 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.
0.201
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.
3.85 s
Page Load Progression
Checks
2718 PASS 6 REVIEW
CImage OptimizationAction6 images, 0 KB saveableREVIEW
Image Optimization
Action6 images, 0 KB saveable
6 images, 0 KB saveable
Warning::
https://www.bloemendaal.nl/fileadmin/Bloemendaal/A... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.bloemendaal.nl/fileadmin/_processed_/f... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.bloemendaal.nl/fileadmin/_processed_/2... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.bloemendaal.nl/fileadmin/_processed_/7... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
6 images 125 KB
0 oversized -0 KB
5 legacy format
4 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
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
BJS Execution Cost936ms total JS executionREVIEW
JS Execution Cost
936ms total JS execution
936ms total JS execution
Warning::
https://www.bloemendaal.nl/: 675ms CPU time
Warning::
Unattributable: 261ms CPU time
Main Thread Breakdown
Style & Layout 39% Other 36% Script Evaluation 9% Rendering 9% Parse HTML & CSS 6%
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.bloemendaal.nl/ | 675ms | 5ms | 1ms | 1st |
| Unattributable | 261ms | 7ms | 0ms | 1st |
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.
BDocument CompressionDocument response uses gzip; brotli would be ~20% smallerREVIEW
Document Compression
Document response uses gzip; brotli would be ~20% smaller
Document response uses gzip; brotli would be ~20% smaller
Info::
Main HTML response uses gzip (brotli would be ~20% smaller)
All current browsers support brotli. Most CDNs (Cloudflare, Fastly, AWS CloudFront, Vercel, Netlify) can switch from gzip to brotli with a single config flag. Origin servers (nginx, Apache) need a brotli module compiled in -- nginx-brotli or Apache mod_brotli.
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.
BHTTP Cachingno-cacheREVIEW
HTTP Caching
no-cache
no-cache
Info::
Cache-Control header is set
Got: no-cache
Info::
ETag present — enables conditional (304) responses
Cache-Control
no-cache
| Directive | Value | Meaning |
|---|---|---|
| no-cache | — | Cache but always revalidate first |
A+Page Weight Budget435 KB transferred, 78 requestsPASS
Page Weight Budget
435 KB transferred, 78 requests
435 KB transferred, 78 requests
Info::
Page weighs 958 KB (435 KB transferred)
Info::
78 HTTP requests
Info::
Estimated 0.09 g CO2 per page load
435 KB transferred
78 requests
0.09 g CO2 per page load
Images 125.1 KiB 29%
Fonts 105.7 KiB 24%
CSS 85.9 KiB 20%
JavaScript 56.9 KiB 13%
HTML 29.6 KiB 7%
Other 29.2 KiB 7%
Other 3.1 KiB 1%
0 2.4 MB 4.9 MB
Under budget
AThird-Party Impact28% third-party, 0 ms blockingPASS
Third-Party Impact
28% third-party, 0 ms blocking
28% third-party, 0 ms blocking
Info::
Third-party code accounts for 28% of page weight (120.5 KiB of 435.5 KiB)
Info::
Third-party blocking time is low (0 ms)
72%
28%
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 Loading5 fonts (106 KB)PASS
Font Loading
5 fonts (106 KB)
5 fonts (106 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
5
106 KB total
Render-blocking
0
of 5
Dominant font-display
swap
Most common across fonts
Font loading timeline
Transfer FOIT (block) FOUT (swap)
fira-sans-v16-latin-reg... woff2 swap
Size 22 KB
Load time 31 ms
Start 407 ms
Risk FOUT — text flashes from fallback to web font
fira-sans-v16-latin-500... woff2 swap
Size 22 KB
Load time 34 ms
Start 407 ms
Risk FOUT — text flashes from fallback to web font
fira-sans-v16-latin-700... woff2 swap
Size 23 KB
Load time 35 ms
Start 407 ms
Risk FOUT — text flashes from fallback to web font
x-font-ttf;charset=utf-... unknown swap
Size 13 KB
Load time 13 ms
Start 621 ms
Risk FOUT — text flashes from fallback to web font
font-woff;charset=utf-8... woff swap
Size 25 KB
Load time 13 ms
Start 622 ms
Risk FOUT — text flashes from fallback to web font
- Convert to woff2 for ~30% smaller file size
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 ~11 KB and ~22 ms
A+JS Bundles16 scripts, 0 KB unusedPASS
JS Bundles
16 scripts, 0 KB unused
16 scripts, 0 KB unused
0 KB unused JavaScript
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.bloemendaal.nl/typo3temp/assets/js/856c21b0ff0e696ddc4682e1b0c79e19.js?1794363296 | 1 KB | — | ✓ | 1st |
| https://cdn-eu.readspeaker.com/script/6705/webReader/webReader.js?pids=wr | 29 KB | — | ✓ | 3rd |
| https://www.bloemendaal.nl/typo3temp/assets/js/0f851906d0fb8bbe408c0ec9ef59dfcc.js?1794363294 | 1 KB | — | ✓ | 1st |
| https://www.bloemendaal.nl/typo3temp/assets/js/c61cf696477a039a40af6adc6921939d.js?1794363294 | 0 KB | — | ✓ | 1st |
| https://www.bloemendaal.nl/_assets/6c3bf359f8df9d9222347f37e2814501/JavaScript/OpenGemeentenSiteSearch-PageHeader-Search.min.js?1794359036 | 1 KB | — | ✓ | 1st |
| https://www.bloemendaal.nl/_assets/6c3bf359f8df9d9222347f37e2814501/JavaScript/OpenGemeentenSiteSearch-Suggest.min.js?1794359036 | 2 KB | — | ✓ | 1st |
| https://www.bloemendaal.nl/_assets/f52859db1e4f013bae2a279b52772e55/Js/OpenGemeentenCeFeatureCollapsible.min.js?1794359035 | 2 KB | — | ✓ | 1st |
| https://www.bloemendaal.nl/_assets/317130fbcbb12622b6e28e3bfff3cb16/Js/OpenGemeentenSite-Focusable.min.js?1794359036 | 0 KB | — | ✓ | 1st |
| https://www.bloemendaal.nl/_assets/317130fbcbb12622b6e28e3bfff3cb16/Js/OpenGemeentenSite-FragmentScroll.min.js?1794359036 | 1 KB | — | ✓ | 1st |
| https://www.bloemendaal.nl/_assets/317130fbcbb12622b6e28e3bfff3cb16/Js/OpenGemeentenSite-Media.min.js?1794359036 | 2 KB | — | ✓ | 1st |
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 HintsNo optimization neededPASS
Resource Hints
No optimization needed
No optimization needed
Info::
No resource hint issues
AAsset Compression1 of 1 asset host still on gzipPASS
Asset Compression
1 of 1 asset host still on gzip
1 of 1 asset host still on gzip
Info::
cdn-eu.readspeaker.com serves assets with gzip; brotli would be ~20% smaller (assets: 3)
Every current browser accepts brotli. On a CDN this is a per-pull-zone toggle (Cloudflare, Fastly, CloudFront, CDN77, Bunny all expose it); on an origin it needs the brotli module (nginx-brotli, Apache mod_brotli). The saving lands on the assets this host serves, not on the HTML document -- the document's own encoding is reported separately.
Got: cdn-eu.readspeaker.com (text/css)
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-cache -- safe revalidate-on-request policyPASS
Main HTML Cache-Control
Main HTML uses no-cache -- safe revalidate-on-request policy
Main HTML uses no-cache -- safe revalidate-on-request policy
Info::
Main HTML uses no-cache -- safe revalidate-on-request policy
Got: no-cache
A+Server Response Intelligence2 server-response signal(s) detectedPASS
Server Response Intelligence
2 server-response signal(s) detected
2 server-response signal(s) detected
Info::
`Vary` header declared: Accept-Encoding
The page declares a `Vary` header, telling downstream caches which request headers the response varies on. Critical for content-negotiated responses (compression, language, cookies, device class).
Info::
`ETag` present -- conditional GET supported
A+Page Weight Inventory78 resources · 435 KB · 0 KB savings availablePASS
Page Weight Inventory
78 resources · 435 KB · 0 KB savings available
78 resources · 435 KB · 0 KB savings available
Info::
Within 1MB page-weight target
Got: 435 KB
Info::
7 third-party resources (28% of weight)
78 resources · 435.5 KiB · 7 third-party Within 1MB page-weight target
Image 35% · 154.3 KiB
Font 24% · 105.7 KiB
CSS 20% · 85.9 KiB
JavaScript 13% · 56.9 KiB
Document 7% · 32.7 KiB
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 78 resources | 435.5 KiB | ||||||
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::
4 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.
ACSS Performance Depth1 CSS depth issue(s) detectedPASS
CSS Performance Depth
1 CSS depth issue(s) detected
1 CSS depth issue(s) detected
Warning::
42 render-blocking stylesheet(s) -- recommended: <=3
Each `<link rel="stylesheet">` without a non-blocking `media` attribute holds up the first paint. Browsers download all of them before painting any content. Consolidate into 1-2 critical-path stylesheets; defer non-critical CSS via `<link rel="stylesheet" media="print" onload="this.media='all'">` or via the loadCSS pattern; inline above-the-fold CSS in `<style>` to short-circuit the request entirely.
A+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
Whether the site is served from green-energy infrastructure
Green Hosting
This site is hosted on green energy infrastructure
Provider: Leaseweb Global BV
Network Waterfall78 requests over 803msINFO
Network Waterfall
78 requests over 803ms
HTML JavaScript CSS Images Fonts XHR/Fetch Other
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)
789 ms
97% good
INP (p75)
69 ms
98% good
CLS (p75)
0.000
96% good
FCP (p75)
702 ms
TTFB (p75)
383 ms
This origin passes Core Web Vitals assessment
Image Optimization5 images, 364 KB total, 0 KB wastedINFO
Image Optimization
5 images, 364 KB total, 0 KB wasted
Image Optimization Audit
Total Images
5
Total Size
364 KB
5 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.