perf: Load fonts with font-display swap, preloads and caching#889
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Mobile Lighthouse attributes ~400 ms of first-paint delay to the fonts blocking text rendering: - font-display: swap on all six faces, so text renders in the fallback font until the webfonts arrive. - Preload the two above-the-fold fonts (body Noto Sans 400 and heading IBM Plex Mono 600), so they usually arrive before first paint anyway. - Cache the UI bundle assets for a day via netlify.toml headers (the Lighthouse cache-lifetimes finding; a day keeps a stale-css window after deploys short since the file names are not content-hashed).
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Description
I did run a Google Lighthouse/PageSpeed check over the docs site and had Claude help me with fixing some of the issues, namely these two:
font-display: swap: text renders immediately in the fallback font instead of waiting for webfonts (Lighthouse estimates ~400 ms).