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.
2.79 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
6.76 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
402 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.
4.40 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.
6.85 s
Page Load Progression
DJS Execution CostAction2363ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://chineseface.app/_next/static/chunks/0d65ce108889130a.js | 954ms | 888ms | 33ms | 1st |
| https://chineseface.app/ | 713ms | 26ms | 28ms | 1st |
| Unattributable | 357ms | 20ms | 0ms | 1st |
| https://chineseface.app/pwa-prompt.js | 187ms | 184ms | 0ms | 1st |
| https://chineseface.app/_next/static/chunks/a3c38d7b7eff6aa9.js | 86ms | 63ms | 16ms | 1st |
| https://chineseface.app/_next/static/chunks/efdc20915a06b05d.css | 65ms | 0ms | 0ms | 1st |
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 |
BJS Bundles30 scripts, 135 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://chineseface.app/_next/static/chunks/7cc9d8b2d1425685.js | 67 KB | 56 KB (84%) | ✓ | 1st |
| https://chineseface.app/_next/static/chunks/d92a56fffd88a38f.js | 70 KB | 55 KB (84%) | ✓ | 1st |
| https://chineseface.app/_next/static/chunks/0d65ce108889130a.js | 71 KB | 24 KB (34%) | ✓ | 1st |
| https://chineseface.app/_next/static/chunks/712922a2c0e7ffee.js | 21 KB | — | ✓ | 1st |
| https://chineseface.app/_next/static/chunks/e767791ab1bb9364.js | 8 KB | — | ✓ | 1st |
| https://chineseface.app/_next/static/chunks/60b9f827cff795ec.js | 14 KB | — | ✓ | 1st |
| https://chineseface.app/_next/static/chunks/turbopack-257c8d00a9f5e484.js | 5 KB | — | ✓ | 1st |
| https://chineseface.app/_next/static/chunks/4ec9ef178f4f3ca6.js | 2 KB | — | ✓ | 1st |
| https://chineseface.app/_next/static/chunks/f612b7202affd086.js | 8 KB | — | ✓ | 1st |
| https://chineseface.app/_next/static/chunks/f38ebde9f62d89f6.js | 15 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
APage Weight Budget957 KB transferred, 52 requestsPASS
A+Third-Party Impact1% third-party, 0 ms blockingPASS
A+Text CompressionAll text resources are compressedPASS
A+Image Optimization3 images, 0 KB saveablePASS
A+Font Loading3 fonts (106 KB)PASS
Web fonts
3
106 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 Hints7 hints, 0 missing preconnectsPASS
Current Resource Hints
7 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+Main HTML Cache-ControlMain HTML uses no-store -- correct for sensitive/dynamic contentPASS
A+Server-Timing Observability3 Server-Timing entries advertisedPASS
A+Server Response Intelligence2 server-response signal(s) detectedPASS
A+Page Weight Inventory52 resources · 957 KB · 135 KB savings availablePASS
~134.6 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 52 resources | 957.1 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 Waterfall52 requests over 3701msINFO
Image Optimization13 images, 342 KB total, 203 KB wastedINFO
Image Optimization Audit
Total Images
13
Total Size
342 KB
Oversized
2
Wasted
203 KB