Performance
· 22 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.
527 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
1.27 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.
541 ms
Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.
1.27 s
Page Load Progression
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BPage Weight Budget1.3 MB transferred, 43 requestsREVIEW
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.
Source: web.dev
CJS BundlesAction13 scripts, 190 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://kb.kenzaboulahlib.com/_next/static/chunks/1sdktclx1z409.js | 249 KB | 93 KB (37%) | ✓ | 1st |
| https://kb.kenzaboulahlib.com/_next/static/chunks/3ue7wiuw25wut.js | 167 KB | 65 KB (39%) | ✓ | 1st |
| https://kb.kenzaboulahlib.com/_next/static/chunks/3g88-k_mr0ij_.js | 51 KB | 32 KB (64%) | ✓ | 1st |
| https://kb.kenzaboulahlib.com/_next/static/chunks/turbopack-3r0-254s9xgze.js | 11 KB | — | ✓ | 1st |
| https://kb.kenzaboulahlib.com/_next/static/chunks/3vh79b34wybuo.js | 14 KB | — | ✓ | 1st |
| https://kb.kenzaboulahlib.com/_next/static/chunks/1q9ms_9fy2szz.js | 5 KB | — | ✓ | 1st |
| https://kb.kenzaboulahlib.com/_next/static/chunks/0pgxq_z4iqpxg.js | 24 KB | — | ✓ | 1st |
| https://kb.kenzaboulahlib.com/_next/static/chunks/192pszfgyn3j-.js | 3 KB | — | ✓ | 1st |
| https://kb.kenzaboulahlib.com/_next/static/chunks/0eopf9lh3-c4x.js | 47 KB | — | ✓ | 1st |
| https://kb.kenzaboulahlib.com/_next/static/chunks/2s1_q15j8x2qg.js | 60 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
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
CDocument CompressionActionDocument response served uncompressedREVIEW
BMain HTML Cache-ControlNo Cache-Control header on main HTML responseREVIEW
BServer-Timing ObservabilityNo Server-Timing header foundREVIEW
BPage Weight Inventory43 resources · 1.3 MB · 190 KB savings availableREVIEW
~190.1 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 43 resources | 1.3 MiB | ||||||
A+Third-Party ImpactNo third-party resourcesPASS
A+Text CompressionAll text resources are compressedPASS
A+Image Optimization7 images, 0 KB saveablePASS
A+JS Execution Cost325ms total JS executionPASS
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://kb.kenzaboulahlib.com/_next/static/chunks/1sdktclx1z409.js | 141ms | 117ms | 5ms | 1st |
| https://kb.kenzaboulahlib.com/en | 105ms | 6ms | 2ms | 1st |
| Unattributable | 78ms | 4ms | 0ms | 1st |
A+Font Loading5 fonts (138 KB)PASS
Web fonts
5
138 KB total
Render-blocking
0
of 5
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+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
A+LCP Image PreloadLCP preload audit not availablePASS
A+Server Response Intelligence1 server-response signal(s) detectedPASS
A+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
This site is hosted on green energy infrastructure
Provider: Infomaniak
Asset CompressionNo text asset hosts to measureINFO
Network Waterfall43 requests over 2100msINFO
Image Optimization11 images, 148 KB total, 44 KB wastedINFO
Image Optimization Audit
Total Images
11
Total Size
148 KB
Oversized
1
Wasted
44 KB