Performance
· 25 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.
4.14 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
8.85 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
424 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.
4.16 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.
8.91 s
Page Load Progression
DJS Execution CostAction2159ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://companies.si/_app/immutable/chunks/eHNFRpxQ.js | 1017ms | 843ms | 1ms | 1st |
| Unattributable | 546ms | 131ms | 0ms | 1st |
| https://companies.si/ | 486ms | 39ms | 207ms | 1st |
| https://companies.si/_app/immutable/chunks/BTavBtkx.js | 111ms | 105ms | 1ms | 1st |
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, 37 requestsREVIEW
BImage Optimization13 images, 0 KB saveableREVIEW
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
BMain HTML Cache-ControlNo Cache-Control header on main HTML responseREVIEW
BPage Weight Inventory37 resources · 1.3 MB · 27 KB savings availableREVIEW
~27.0 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 37 resources | 1.3 MiB | ||||||
A+Third-Party Impact17% third-party, 0 ms blockingPASS
A+Text CompressionAll text resources are compressedPASS
A+Font Loading1 fonts (47 KB)PASS
Web fonts
1
47 KB total
Render-blocking
0
of 1
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+JS Bundles17 scripts, 27 KB unusedPASS
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://companies.si/_app/immutable/chunks/eHNFRpxQ.js | 45 KB | 27 KB (60%) | ✓ | 1st |
| https://companies.si/_app/immutable/chunks/X5C--DI7.js | 1 KB | — | ✓ | 1st |
| https://companies.si/_app/immutable/chunks/DiKSXGcS.js | 1 KB | — | ✓ | 1st |
| https://companies.si/_app/immutable/entry/app.GHlQvnBf.js | 2 KB | — | ✓ | 1st |
| https://companies.si/_app/immutable/chunks/kNaey6uv.js | 1 KB | — | ✓ | 1st |
| https://companies.si/_app/immutable/chunks/xihTtKlq.js | 1 KB | — | ✓ | 1st |
| https://companies.si/_app/immutable/nodes/0.DhANugUN.js | 5 KB | — | ✓ | 1st |
| https://companies.si/_app/immutable/chunks/BTavBtkx.js | 20 KB | — | ✓ | 1st |
| https://companies.si/_app/immutable/chunks/Zjg9KXtG.js | 1 KB | — | ✓ | 1st |
| https://companies.si/_app/immutable/chunks/BqTYwzEh.js | 1 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
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
A+HTTP/3 (QUIC)HTTP/3 advertised via Alt-SvcPASS
A+Compression AlgorithmMain response uses brotliPASS
A+LCP Image PreloadLCP preload audit not availablePASS
A+Server-Timing Observability3 Server-Timing entries advertisedPASS
AServer Response Intelligence2 server-response signal(s) detectedPASS
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
A+JavaScript BlockingNo render-blocking JS or document.write usage detectedPASS
A+CSS Performance DepthNo CSS performance depth issues detectedPASS
A+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
This site is hosted on green energy infrastructure
Provider: Cloudflare
Network Waterfall37 requests over 846msINFO
Image Optimization14 images, 1436 KB total, 0 KB wastedINFO
Image Optimization Audit
Total Images
14
Total Size
1436 KB