Performance
· 21 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.
1.00 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
1.80 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
79 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.
1.17 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.
1.80 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, 50 requestsREVIEW
BImage Optimization25 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
BJS Execution Cost625ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://companies.si/_app/immutable/chunks/eHNFRpxQ.js | 314ms | 235ms | 0ms | 1st |
| https://companies.si/ | 157ms | 9ms | 46ms | 1st |
| Unattributable | 153ms | 32ms | 0ms | 1st |
BMain HTML Cache-ControlNo Cache-Control header on main HTML responseREVIEW
BPage Weight Inventory50 resources · 1.3 MB · 27 KB savings availableREVIEW
~26.9 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 50 resources | 1.3 MiB | ||||||
A+Third-Party Impact17% third-party, 0 ms blockingPASS
A+Text CompressionAll text resources are compressedPASS
A+Font Loading2 fonts (71 KB)PASS
Web fonts
2
71 KB total
Render-blocking
0
of 2
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 HintsNo optimization neededPASS
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+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
This site is hosted on green energy infrastructure
Provider: Cloudflare
Network Waterfall50 requests over 835msINFO
Image Optimization14 images, 1436 KB total, 0 KB wastedINFO
Image Optimization Audit
Total Images
14
Total Size
1436 KB