Performance
· 26 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.
992 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
1.70 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
248 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.
1.24 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.
3.00 s
Page Load Progression
DJS Execution CostAction2407ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://batlist.it/ | 1404ms | 8ms | 12ms | 1st |
| https://batlist.it/_next/static/chunks/27hi3s81pf0d4.js | 333ms | 284ms | 12ms | 1st |
| Unattributable | 329ms | 22ms | 0ms | 1st |
| https://batlist.it/_next/static/chunks/2khxl0v1q4i6n.js | 236ms | 183ms | 20ms | 1st |
| https://batlist.it/_next/static/chunks/2ur-07uzw_dpy.js | 106ms | 84ms | 22ms | 1st |
BJS Bundles10 scripts, 82 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://batlist.it/_next/static/chunks/2ur-07uzw_dpy.js | 67 KB | 55 KB (83%) | ✓ | 1st |
| https://batlist.it/_next/static/chunks/2khxl0v1q4i6n.js | 71 KB | 28 KB (39%) | ✓ | 1st |
| https://batlist.it/_next/static/chunks/1x6obpmlu1_c2.js | 3 KB | — | ✓ | 1st |
| https://batlist.it/_next/static/chunks/2r4s4h5xul1n-.js | 9 KB | — | ✓ | 1st |
| https://batlist.it/_next/static/chunks/27hi3s81pf0d4.js | 46 KB | — | ✓ | 1st |
| https://batlist.it/_next/static/chunks/turbopack-2c3mg3r-05n1w.js | 5 KB | — | ✓ | 1st |
| https://batlist.it/_next/static/chunks/27jv9vfcmfam-.js | 6 KB | — | ✓ | 1st |
| https://batlist.it/_next/static/chunks/1u6vs4ytc64wv.js | 15 KB | — | ✓ | 1st |
| https://batlist.it/_next/static/chunks/0oxowbi_27886.js | 2 KB | — | ✓ | 1st |
| https://batlist.it/_next/static/chunks/41ztz968auooq.js | 10 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
BMain HTML Cache-ControlCache-Control present but without max-ageREVIEW
BServer-Timing ObservabilityNo Server-Timing header foundREVIEW
BHTTP Cachings-maxage=3600, stale-while-revalidate=31532400REVIEW
s-maxage=3600, stale-while-revalidate=31532400
| Directive | Value | Meaning |
|---|---|---|
| s-maxage | 3600 | CDN caches for 1 hour |
| stale-while-revalidate | 31532400 | Serve stale for 52 weeks while fetching fresh |
A+Page Weight Budget512 KB transferred, 37 requestsPASS
A+Third-Party ImpactNo third-party resourcesPASS
A+Text CompressionAll text resources are compressedPASS
A+Image OptimizationNo images on this pagePASS
A+Font Loading3 fonts (110 KB)PASS
Web fonts
3
110 KB total
Render-blocking
0
of 3
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 Hints4 hints, 0 missing preconnectsPASS
Current Resource Hints
4 resource hints configured
A+HTTP/3 (QUIC)HTTP/3 advertised via Alt-SvcPASS
A+Document CompressionDocument response uses brotliPASS
A+LCP Image PreloadLCP preload audit not availablePASS
A+Server Response Intelligence2 server-response signal(s) detectedPASS
A+Page Weight Inventory37 resources · 512 KB · 82 KB savings availablePASS
~82.4 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 37 resources | 512.1 KiB | ||||||
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
AJavaScript Blocking1 JS blocking issue(s) 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
Asset CompressionNo text asset hosts to measureINFO
Network Waterfall37 requests over 969msINFO
Image Optimization6 images, 0 KB total, 0 KB wastedINFO
Image Optimization Audit
Total Images
6
Total Size
0 KB