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.
548 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
1.05 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.
548 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.
1.05 s
Page Load Progression
DHTTP CachingActionno-store (uncacheable)FIX
private, no-cache, no-store, max-age=0, must-revalidate
| Directive | Value | Meaning |
|---|---|---|
| private | — | Only browser cache, not CDN/proxy |
| no-cache | — | Cache but always revalidate first |
| no-store | — | Never cache this response |
| max-age | 0 | Cache for 0 seconds |
| must-revalidate | — | Must recheck with server after expiry |
BServer-Timing ObservabilityNo Server-Timing header foundREVIEW
A+Page Weight Budget567 KB transferred, 32 requestsPASS
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
A+Third-Party ImpactNo third-party resourcesPASS
A+Text CompressionAll text resources are compressedPASS
A+Image Optimization1 images, 0 KB saveablePASS
A+JS Execution Cost182ms total JS executionPASS
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://costdown.org/ | 114ms | 3ms | 2ms | 1st |
| Unattributable | 68ms | 10ms | 0ms | 1st |
A+Font Loading6 fonts (217 KB)PASS
Web fonts
6
217 KB total
Render-blocking
0
of 6
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 Bundles10 scripts, 0 KB unusedPASS
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://costdown.org/_next/static/chunks/webpack-acb34275d54b1fbc.js | 3 KB | — | ✓ | 1st |
| https://costdown.org/_next/static/chunks/4bd1b696-f785427dddbba9fb.js | 54 KB | — | ✓ | 1st |
| https://costdown.org/_next/static/chunks/1255-fc6c00ab2f765339.js | 47 KB | — | ✓ | 1st |
| https://costdown.org/_next/static/chunks/main-app-05a5fe279f4f6e20.js | 1 KB | — | ✓ | 1st |
| https://costdown.org/_next/static/chunks/2619-3c9e02e22d10480a.js | 4 KB | — | ✓ | 1st |
| https://costdown.org/_next/static/chunks/8009-97160b4721ad2c74.js | 152 KB | — | ✓ | 1st |
| https://costdown.org/_next/static/chunks/2337-8f491b67f44c9a7e.js | 4 KB | — | ✓ | 1st |
| https://costdown.org/_next/static/chunks/app/%5Blang%5D/layout-a148063d6c62847b.js | 4 KB | — | ✓ | 1st |
| https://costdown.org/_next/static/chunks/5905-8122912d4be580e7.js | 20 KB | — | ✓ | 1st |
| https://costdown.org/_next/static/chunks/app/%5Blang%5D/page-778be06fec310a48.js | 2 KB | — | ✓ | 1st |
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+Main HTML Cache-ControlMain HTML uses no-store -- correct for sensitive/dynamic contentPASS
A+Server Response Intelligence2 server-response signal(s) detectedPASS
A+Page Weight Inventory32 resources · 567 KB · 0 KB savings availablePASS
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 32 resources | 566.8 KiB | ||||||
A+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
This site is hosted on green energy infrastructure
Provider: Cloudflare
Network Waterfall32 requests over 563msINFO
Image Optimization1 images, 9 KB total, 9 KB wastedINFO
Image Optimization Audit
Total Images
1
Total Size
9 KB
Oversized
1
Wasted
9 KB