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.
9.77 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
12.66 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.
0.000
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
9.77 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.
12.67 s
Page Load Progression
DJS Execution CostAction2612ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| Unattributable | 868ms | 318ms | 0ms | 1st |
| https://krimpenaandenijssel.nl/ | 811ms | 32ms | 5ms | 1st |
| https://krimpenaandenijssel.nl/app/themes/lyfter-child/dist/assets/script-DtG3K5aN.js | 297ms | 17ms | 0ms | 1st |
| https://www.googletagmanager.com/gtag/js?id=G-0QFX5FC072&cx=c>m=4e6ba1 | 213ms | 168ms | 43ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-W3STJSW2 | 162ms | 124ms | 37ms | 3rd |
| https://krimpenaandenijssel.nl/app/themes/lyfter/dist-legacy/assets/legacy-ts-ykiYu1iR.js | 145ms | 134ms | 0ms | 1st |
| https://cdnjs.cloudflare.com/ajax/libs/jquery/3.7.1/jquery.min.js?lfr=My43LjE%3D | 117ms | 84ms | 5ms | 3rd |
BPage Weight Budget1.3 MB transferred, 394 requestsREVIEW
Subset fonts to include only used characters, or switch to system font stacks.
Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).
Source: web.dev font loading
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.
Source: web.dev
BJS Bundles20 scripts, 140 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.googletagmanager.com/gtag/js?id=G-0QFX5FC072&cx=c>m=4e6ba1 | 177 KB | 76 KB (43%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-W3STJSW2 | 122 KB | 65 KB (54%) | ✓ | 3rd |
| https://krimpenaandenijssel.nl/app/themes/lyfter/dist-legacy/assets/preload-helper-Djs6zF7v.js | 1 KB | — | ✓ | 1st |
| https://krimpenaandenijssel.nl/app/plugins/cookie-law-info/legacy/public/js/cookie-law-info-public.js?lfr=My41Ljg%3D | 8 KB | — | ✓ | 1st |
| https://cdn-eu.readspeaker.com/script/13334/webReader/webReader.js?pids=wr&ver=2.5.0 | 28 KB | — | ✓ | 3rd |
| https://krimpenaandenijssel.nl/app/themes/lyfter/dist-legacy/assets/legacy-ts-ykiYu1iR.js | 6 KB | — | ✓ | 1st |
| https://krimpenaandenijssel.nl/app/themes/lyfter/dist-legacy/assets/chunk-p60oCPdu.js | 0 KB | — | ✓ | 1st |
| https://krimpenaandenijssel.nl/app/themes/lyfter/dist-legacy/assets/defineProperty-Czyh_RxS.js | 1 KB | — | ✓ | 1st |
| https://cdnjs.cloudflare.com/ajax/libs/jquery/3.7.1/jquery.min.js?lfr=My43LjE%3D | 27 KB | — | ✓ | 3rd |
| https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.4/js/bootstrap.min.js?lfr=Ny4xLjQ%3D | 9 KB | — | ✓ | 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
BHTTP/3 (QUIC)HTTP/3 not advertisedREVIEW
BDocument CompressionDocument response uses gzip; brotli would be ~20% smallerREVIEW
BMain HTML Cache-ControlMain HTML max-age=3600 (~60min)REVIEW
BServer-Timing ObservabilityNo Server-Timing header foundREVIEW
CPage Weight InventoryAction394 resources · 1.3 MB · 140 KB savings availableREVIEW
~140.5 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 394 resources | 1.3 MiB | ||||||
AThird-Party Impact34% third-party, 0 ms blockingPASS
A+Text CompressionAll text resources are compressedPASS
AImage Optimization5 images, 0 KB saveablePASS
A+Font Loading138 fonts (616 KB)PASS
Web fonts
138
616 KB total
Render-blocking
0
of 138
Dominant font-display
swap
Most common across fonts
Font loading timeline
- 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
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
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- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
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- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
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- Convert to woff2 for ~30% smaller file size
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- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- 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 ~278 KB and ~556 ms
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
AAsset Compression1 of 1 asset host still on gzipPASS
A+LCP Image PreloadLCP preload audit not availablePASS
A+Server Response Intelligence2 server-response signal(s) detectedPASS
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: BIT
A+HTTP Cachingmax-age=3600 (1 hour)PASS
public, max-age=3600, s-maxage=86400
| Directive | Value | Meaning |
|---|---|---|
| public | — | Any cache may store this response |
| max-age | 3600 | Cache for 1 hour |
| s-maxage | 86400 | CDN caches for 1 day |
Network Waterfall394 requests over 2744msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Google Tag Manager www.googletagmanager.com | Tag Manager | 213ms | 177 KB | 43% | €2/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 162ms | 122 KB | 54% | €2/mo | Optional |
cdnjs cdnjs.cloudflare.com | CDN | 117ms | 27 KB | — | €1/mo | Optional |
These scripts may cost more than they're worth
- Google Tag Manager adds 213ms and costs ~€2/month
Google Tag Manager 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
54% of Google Tag Manager'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)
1205 ms
96% good
INP (p75)
90 ms
96% good
CLS (p75)
0.000
99% good
FCP (p75)
984 ms
TTFB (p75)
725 ms
Image Optimization8 images, 116 KB total, 0 KB wastedINFO
Image Optimization Audit
Total Images
8
Total Size
116 KB