Website-design
Lighthouse 95+ as a floor, not a goal
How and why we treat web performance as a non-negotiable engineering constraint.
Published 2026-05-12
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4 min read
Mobile Lighthouse Performance ≥ 95 is the floor — the minimum acceptable.
What it actually means
- LCP ≤ 1.8 s
- TBT ≤ 150 ms
- CLS ≤ 0.05
- Total transfer ≤ 250 KB gzipped
The decisions that make it free
- SSG (or aggressively cached SSR)
- Zero JS by default
- Tailwind with purge
- AVIF/WebP images
- Subset web fonts
- CDN with Brotli + HTTP/3