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perf: Tune Lighthouse CI config and optimize font loading #12

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Merged
paveg merged 1 commit into from
Jan 3, 2026
Merged

perf: Tune Lighthouse CI config and optimize font loading #12

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18 changes: 18 additions & 0 deletions docs/LIGHTHOUSE_CONFIG.md
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# Lighthouse CI Configuration

## Disabled Assertions

| Assertion | Reason |
|-----------|--------|
| `uses-text-compression` | Cloudflare handles compression at edge |
| `unused-css-rules` | Google Fonts CSS includes styles for all unicode ranges (especially Noto Sans JP) |
| `unused-javascript` | Code splitting causes "unused" JS on initial page load, but chunks are used on other routes |
| `render-blocking-resources` | Returns NaN in SPA configuration |

## Thresholds

- **LCP**: < 2.5s (error)
- **CLS**: < 0.1 (error)
- **FCP**: < 2s (warn)
- **TBT**: < 300ms (warn)
- **Category scores**: ≥ 90% (accessibility is error, others are warn)
6 changes: 3 additions & 3 deletions lighthouserc.json
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Expand Up @@ -23,9 +23,9 @@
"uses-text-compression": "off",
"uses-responsive-images": "warn",
"offscreen-images": "warn",
"unused-javascript": "warn",
"unused-css-rules": "warn",
"render-blocking-resources": "warn"
"unused-javascript": "off",
"unused-css-rules": "off",
"render-blocking-resources": "off"
}
},
"upload": {
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7 changes: 4 additions & 3 deletions src/client/index.html
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Expand Up @@ -117,10 +117,11 @@
<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin />

<!-- Non-blocking font loading with preload + async pattern -->
<link rel="preload" as="style" href="https://fonts.googleapis.com/css2?family=Geist:wght@400;500;600;700&family=Geist+Mono:wght@400;500&family=Noto+Sans+JP:wght@400;500;600;700&display=swap" />
<link rel="stylesheet" href="https://fonts.googleapis.com/css2?family=Geist:wght@400;500;600;700&family=Geist+Mono:wght@400;500&family=Noto+Sans+JP:wght@400;500;600;700&display=swap" media="print" onload="this.media='all'" />
<!-- Optimized: Geist Mono reduced to 400 only (used in code blocks) -->
<link rel="preload" as="style" href="https://fonts.googleapis.com/css2?family=Geist:wght@400;500;600;700&family=Geist+Mono:wght@400&family=Noto+Sans+JP:wght@400;500;600;700&display=swap" />
<link rel="stylesheet" href="https://fonts.googleapis.com/css2?family=Geist:wght@400;500;600;700&family=Geist+Mono:wght@400&family=Noto+Sans+JP:wght@400;500;600;700&display=swap" media="print" onload="this.media='all'" />
<noscript>
<link rel="stylesheet" href="https://fonts.googleapis.com/css2?family=Geist:wght@400;500;600;700&family=Geist+Mono:wght@400;500&family=Noto+Sans+JP:wght@400;500;600;700&display=swap" />
<link rel="stylesheet" href="https://fonts.googleapis.com/css2?family=Geist:wght@400;500;600;700&family=Geist+Mono:wght@400&family=Noto+Sans+JP:wght@400;500;600;700&display=swap" />
</noscript>

<!-- Critical CSS for initial render (prevents FOUT) -->
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