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Performance

· 28 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
89
GRADE
B
FIX
0
REVIEW
9
PASS
15
INFO
4

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

Mobile Desktop
69
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
100
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

3.12 s

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

7.91 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

28 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.

3.63 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.

7.96 s

Page Load Progression

375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 s
Checks
28
15 PASS 9 REVIEW
B
Page Weight Budget
1.1 MB transferred, 92 requests
REVIEW
1.1 MB transferred, 92 requests
Info::
Page weighs 3.8 MB (1.1 MB transferred)
Info::
92 HTTP requests
Info::
Estimated 0.24 g CO2 per page load
1.1 MB / 2.4 MB budget
1.1 MB transferred
92 requests
0.24 g CO2 per page load
JavaScript 468.5 KiB 40%
Images 313.5 KiB 27%
Other 189.8 KiB 16%
CSS 66.4 KiB 6%
Fonts 56.6 KiB 5%
Other 48.2 KiB 4%
HTML 17.8 KiB 2%
Other 0 B 0%
0 2.4 MB 4.9 MB
Under budget
B
Third-Party Impact
58% third-party, 0 ms blocking
REVIEW
58% third-party, 0 ms blocking
Warning::
Third-party code accounts for 58% of page weight (676.5 KiB of 1.1 MiB)
Info::
Third-party blocking time is low (0 ms)
42%
58%
First-party Third-party
C
Image Optimization
Action
15 images, 0 KB saveable
REVIEW
15 images, 0 KB saveable
Warning::
https://www.deventer.nl/fileadmin/_processed_/b/5/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.deventer.nl/fileadmin/_processed_/0/a/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.deventer.nl/fileadmin/_processed_/c/f/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.deventer.nl/fileadmin/_processed_/9/a/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.deventer.nl/fileadmin/_processed_/f/e/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.deventer.nl/fileadmin/deventer_website... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.deventer.nl/fileadmin/deventer_website... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.deventer.nl/fileadmin/_processed_/2/0/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
15 images 314 KB
0 oversized -0 KB
9 legacy format
8 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

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

C
JS Execution Cost
Action
1150ms total JS execution
REVIEW
1150ms total JS execution
Warning::
Unattributable: 409ms CPU time
Warning::
https://www.deventer.nl/: 351ms CPU time
Warning::
https://app.tolkie.nl/: 334ms CPU time
Info::
https://siteimproveanalytics.com/js/siteanalyze_60...: 56ms CPU time
Info::
Third-party scripts: 390ms (34% of total)

Main Thread Breakdown

Other 40% Style & Layout 29% Script Evaluation 22% Parse HTML & CSS 4% Rendering 4%
ScriptTotalScriptingParse/CompileParty
Unattributable409ms22ms0ms1st
https://www.deventer.nl/351ms9ms1ms1st
https://app.tolkie.nl/334ms171ms2ms3rd
https://siteimproveanalytics.com/js/siteanalyze_6005999.js56ms49ms5ms3rd
B
HTTP/3 (QUIC)
HTTP/3 not advertised
REVIEW
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.
B
Document Compression
Document response uses gzip; brotli would be ~20% smaller
REVIEW
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.
B
Server-Timing Observability
No Server-Timing header found
REVIEW
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.
B
Page Weight Inventory
92 resources · 1.1 MB · 21 KB savings available
REVIEW
92 resources · 1.1 MB · 21 KB savings available
Warning::
Page weight 1.1 MB exceeds 1 MB target by 137 KB
Got: 1.1 MB Expected: ≤ 1 MB
Warning::
18 third-party resources (58% of weight)
Info::
2 resources over 200KB
92 resources · 1.1 MiB · 18 third-party 136.8 KiB over 1MB target
Image 47% · 549.2 KiB
JavaScript 40% · 468.5 KiB
CSS 6% · 66.4 KiB
Font 5% · 56.6 KiB
Document 2% · 17.8 KiB
Other 0% · 2.2 KiB

~20.7 KiB of savings available

Remove unused JavaScript: 20.7 KiB
B
HTTP Caching
no-cache
REVIEW
no-cache
Info::
Cache-Control header is set
Got: no-cache
Info::
ETag present — enables conditional (304) responses
Cache-Control

no-cache

DirectiveValueMeaning
no-cache—Cache but always revalidate first
A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+
Font Loading
4 fonts (57 KB)
PASS
4 fonts (57 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

57 KB total

Render-blocking

0

of 4

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s FCP 3.1 s LCP 7.9 shttps://www.deventer.nl/_assets/0f9cfdc0bbcc5470cebdb57a7ff8c836/Fonts/PublicSans/public-sans-v18-latin-regular.woff2public-sans-v18-latin-r... https://www.deventer.nl/_assets/0f9cfdc0bbcc5470cebdb57a7ff8c836/Fonts/PublicSans/public-sans-v18-latin-regular.woff2 — 14.4 KiB — 32 ms — font-display: swaphttps://www.deventer.nl/_assets/0f9cfdc0bbcc5470cebdb57a7ff8c836/Fonts/PublicSans/public-sans-v18-latin-600.woff2public-sans-v18-latin-6... https://www.deventer.nl/_assets/0f9cfdc0bbcc5470cebdb57a7ff8c836/Fonts/PublicSans/public-sans-v18-latin-600.woff2 — 14.4 KiB — 31 ms — font-display: swaphttps://www.deventer.nl/_assets/0f9cfdc0bbcc5470cebdb57a7ff8c836/Fonts/PublicSans/public-sans-v18-latin-700.woff2public-sans-v18-latin-7... https://www.deventer.nl/_assets/0f9cfdc0bbcc5470cebdb57a7ff8c836/Fonts/PublicSans/public-sans-v18-latin-700.woff2 — 14.4 KiB — 33 ms — font-display: swaphttps://app.tolkie.nl/fonts/atkinson-hyperlegible-next-latin-700-normal.woff2atkinson-hyperlegible-n... https://app.tolkie.nl/fonts/atkinson-hyperlegible-next-latin-700-normal.woff2 — 13.4 KiB — 31 ms — font-display: swap
public-sans-v18-latin-r... woff2 swap
Size 14 KB
Load time 32 ms
Start 489 ms
Risk FOUT — text flashes from fallback to web font
public-sans-v18-latin-6... woff2 swap
Size 14 KB
Load time 31 ms
Start 490 ms
Risk FOUT — text flashes from fallback to web font
public-sans-v18-latin-7... woff2 swap
Size 14 KB
Load time 33 ms
Start 490 ms
Risk FOUT — text flashes from fallback to web font
atkinson-hyperlegible-n... woff2 swap
Size 13 KB
Load time 31 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
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 Bundles
15 scripts, 21 KB unused
PASS
15 scripts, 21 KB unused
Warning::
https://app.tolkie.nl/: 21 KB unused (11%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 21 KB
21 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://app.tolkie.nl/208 KB21 KB (11%)✓3rd
https://www.deventer.nl/typo3temp/assets/js/0f851906d0fb8bbe408c0ec9ef59dfcc.js?17943635881 KB—✓1st
https://www.deventer.nl/typo3temp/assets/js/0c2faba04e4471b67a86c3a36cb39273.js?17943635880 KB—✓1st
https://www.deventer.nl/_assets/6c3bf359f8df9d9222347f37e2814501/JavaScript/OpenGemeentenSiteSearch-PageHeader-Search.min.js?17943590361 KB—✓1st
https://www.deventer.nl/_assets/6c3bf359f8df9d9222347f37e2814501/JavaScript/OpenGemeentenSiteSearch-Suggest.min.js?17943590362 KB—✓1st
https://www.deventer.nl/_assets/f52859db1e4f013bae2a279b52772e55/Js/OpenGemeentenCeFeatureCollapsible.min.js?17943590352 KB—✓1st
https://www.deventer.nl/_assets/317130fbcbb12622b6e28e3bfff3cb16/Js/OpenGemeentenSite-Focusable.min.js?17943590360 KB—✓1st
https://www.deventer.nl/_assets/317130fbcbb12622b6e28e3bfff3cb16/Js/OpenGemeentenSite-FragmentScroll.min.js?17943590361 KB—✓1st
https://www.deventer.nl/_assets/317130fbcbb12622b6e28e3bfff3cb16/Js/OpenGemeentenSite-Media.min.js?17943590362 KB—✓1st
https://www.deventer.nl/_assets/317130fbcbb12622b6e28e3bfff3cb16/Js/OpenGemeentenSite-PageHeader-Collapsible.min.js?17943590361 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

A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
A+
Asset Compression
All 1 asset host use brotli
PASS
All 1 asset host use brotli
Info::
app.tolkie.nl serves assets with brotli (assets: 3)
Got: app.tolkie.nl (text/css)
A+
LCP Image Preload
LCP preload audit not available
PASS
LCP preload audit not available
Info::
LCP image preload audit not available for this scan
A+
Main HTML Cache-Control
Main HTML uses no-cache -- safe revalidate-on-request policy
PASS
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 Intelligence
2 server-response signal(s) detected
PASS
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+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
A
JavaScript Blocking
1 JS blocking issue(s) detected
PASS
1 JS blocking issue(s) detected
Warning::
2 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 Depth
1 CSS depth issue(s) detected
PASS
1 CSS depth issue(s) detected
Warning::
44 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 Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Leaseweb Global BV

Network Waterfall
92 requests over 1126ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s FCP 3.1 s LCP 7.9 shttps://www.deventer.nl// https://www.deventer.nl/ — 200 — 16.6 KiB — 204 ms — h2https://www.deventer.nl/typo3temp/assets/compressed/merged-16cf7be8d0ecc528ebe84939fe77024c.css?1794363588/typo3temp/assets/compressed/merged... https://www.deventer.nl/typo3temp/assets/compressed/merged-16cf7be8d0ecc528ebe84939fe77024c.css?1794363588 — 200 — 2.3 KiB — 32 ms — h2https://www.deventer.nl/typo3temp/assets/compressed/merged-c5fcb6c8a22f950c130c6113ea921e71.css?1794363588/typo3temp/assets/compressed/merged... https://www.deventer.nl/typo3temp/assets/compressed/merged-c5fcb6c8a22f950c130c6113ea921e71.css?1794363588 — 200 — 768 B — 29 ms — h2https://www.deventer.nl/typo3temp/assets/compressed/merged-7fc3a4316ba213dc26036cb24f5c215e.css?1794363588/typo3temp/assets/compressed/merged... https://www.deventer.nl/typo3temp/assets/compressed/merged-7fc3a4316ba213dc26036cb24f5c215e.css?1794363588 — 200 — 811 B — 33 ms — h2https://www.deventer.nl/typo3temp/assets/compressed/merged-951d11518c1816d86a55c380dccf617b.css?1794363589/typo3temp/assets/compressed/merged... https://www.deventer.nl/typo3temp/assets/compressed/merged-951d11518c1816d86a55c380dccf617b.css?1794363589 — 200 — 432 B — 53 ms — h2https://www.deventer.nl/typo3temp/assets/compressed/merged-96607cdb8c1b743af30a6336b29d950e.css?1794363589/typo3temp/assets/compressed/merged... https://www.deventer.nl/typo3temp/assets/compressed/merged-96607cdb8c1b743af30a6336b29d950e.css?1794363589 — 200 — 2.6 KiB — 55 ms — h2https://www.deventer.nl/typo3temp/assets/compressed/merged-51d42125eb151464575286df5a4875f7.css?1794363588/typo3temp/assets/compressed/merged... https://www.deventer.nl/typo3temp/assets/compressed/merged-51d42125eb151464575286df5a4875f7.css?1794363588 — 200 — 496 B — 70 ms — h2https://www.deventer.nl/typo3temp/assets/compressed/merged-dc143fc6706c47bd6cf55e1af50ce072.css?1794363588/typo3temp/assets/compressed/merged... https://www.deventer.nl/typo3temp/assets/compressed/merged-dc143fc6706c47bd6cf55e1af50ce072.css?1794363588 — 200 — 7.0 KiB — 58 ms — h2https://www.deventer.nl/typo3temp/assets/compressed/merged-f7704379d4fe40363d681ed35807a40f.css?1794363588/typo3temp/assets/compressed/merged... https://www.deventer.nl/typo3temp/assets/compressed/merged-f7704379d4fe40363d681ed35807a40f.css?1794363588 — 200 — 2.2 KiB — 58 ms — h2https://www.deventer.nl/typo3temp/assets/compressed/merged-96b4d07c6a931554ed809a8593e518bc.css?1794363588/typo3temp/assets/compressed/merged... https://www.deventer.nl/typo3temp/assets/compressed/merged-96b4d07c6a931554ed809a8593e518bc.css?1794363588 — 200 — 370 B — 60 ms — h2https://www.deventer.nl/typo3temp/assets/compressed/merged-921632a434854b096382783b16a8fcba.css?1794363588/typo3temp/assets/compressed/merged... https://www.deventer.nl/typo3temp/assets/compressed/merged-921632a434854b096382783b16a8fcba.css?1794363588 — 200 — 558 B — 61 ms — h2https://www.deventer.nl/typo3temp/assets/compressed/merged-a6692b7a30c67edb8f660e2e12859bd9.css?1794363588/typo3temp/assets/compressed/merged... https://www.deventer.nl/typo3temp/assets/compressed/merged-a6692b7a30c67edb8f660e2e12859bd9.css?1794363588 — 200 — 349 B — 63 ms — h2https://www.deventer.nl/typo3temp/assets/compressed/merged-58ea71f6117b4cfe9a382615b494b277.css?1794363588/typo3temp/assets/compressed/merged... https://www.deventer.nl/typo3temp/assets/compressed/merged-58ea71f6117b4cfe9a382615b494b277.css?1794363588 — 200 — 711 B — 65 ms — h2https://www.deventer.nl/typo3temp/assets/compressed/merged-1e66acaa5d785e84e302163b57c766a5.css?1794363588/typo3temp/assets/compressed/merged... https://www.deventer.nl/typo3temp/assets/compressed/merged-1e66acaa5d785e84e302163b57c766a5.css?1794363588 — 200 — 555 B — 66 ms — h2https://www.deventer.nl/typo3temp/assets/compressed/merged-04fc74a2f3cb9705810d4853fdf0d9f4.css?1794363588/typo3temp/assets/compressed/merged... 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HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
34% of JavaScript execution is third-party
First-party Third-party 390ms · 226KB · €4/mo
app.tolkie.nl
Other
Costly
Execution 334ms
Transfer 208 KB
Unused 11%
Monthly Cost €4/mo
siteimproveanalytics.com
Other
Optional
Execution 56ms
Transfer 18 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • app.tolkie.nl adds 334ms and costs ~€4/month

app.tolkie.nl takes 334ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

How third-party costs are calculated

Real-User Performance (CrUX)
Field metrics from the Chrome User Experience Report
INFO

Chrome User Experience (CrUX)

Real-user metrics from the Chrome UX Report (2026-10-14 — 2026-11-10)

LCP (p75)

814 ms

98% good

INP (p75)

61 ms

99% good

CLS (p75)

0.000

94% good

FCP (p75)

734 ms

TTFB (p75)

337 ms

This origin passes Core Web Vitals assessment
Image Optimization
13 images, 779 KB total, 0 KB wasted
INFO

Image Optimization Audit

Total Images

13

Total Size

779 KB

13 missing dimensions 8 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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