perf: wave D — self-host Inter latin subset, preload, font-display: optional#47
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…ptional Replaces the @fontsource-variable/inter @import with a self-declared @font-face block targeting a single 48 KiB latin subset shipped from /public/fonts/inter-latin-variable.woff2, plus a <link rel="preload"> in BaseLayout.astro so the font byte stream races CSS parsing. - Removes 6 unused @font-face blocks (cyrillic, cyrillic-ext, greek, greek-ext, vietnamese, latin-ext) that fontsource ships by default — the site is English-only. - font-display: optional eliminates FOUT/FOIT entirely; with the preload tag the latin subset typically arrives before first paint. - Cache rule already in place from wave A (/fonts/* immutable, max-age=31536000), so repeat visits skip the network round-trip. JetBrains Mono kept on @fontsource for now — only used in below-fold code blocks, not critical path. Part of audits/perf-2026-05/ remediation. Lighthouse re-run pending.
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Summary
Replaces the
@fontsource-variable/interCSS@importwith a self-declared@font-faceblock targeting a single 48 KiB latin subset shipped from/public/fonts/inter-latin-variable.woff2, plus a<link rel="preload">inBaseLayout.astroso the font byte stream races CSS parsing.Changes
src/styles/global.css— removed the Inter@fontsource-variable@import(which shipped 7@font-faceblocks: cyrillic, cyrillic-ext, greek, greek-ext, vietnamese, latin-ext, latin); replaced with a single@font-faceblock for the latin subset withfont-display: optional.src/layouts/BaseLayout.astro— added<link rel="preload" as="font" type="font/woff2" crossorigin="anonymous" href="/fonts/inter-latin-variable.woff2">to<head>.public/fonts/inter-latin-variable.woff2— new file (48 KiB), copied from the fontsource latin subset.Why
@font-facedeclarations for character ranges the English-only site never renders.font-display: optionalmeans if the font isn't ready within ~100 ms the system font is used and Inter swaps in only on subsequent navigations (cached by then). The preload tag means the latin subset typically arrives before first paint anyway._headersrule covers/fonts/*withCache-Control: public, max-age=31536000, immutable, so repeat visits skip the network round-trip entirely.JetBrains Mono kept on
@fontsource— only used in below-fold code blocks, not critical path.WD2 (scope
.monaco-editor/.skeleton/.proseoverrides) deliberately skipped —.proseis used by ~10 routes (every learn/tools/quiz page), so a separate import wouldn't materially reduce unused CSS; the.monaco-editorand.skeletonrules are <20 lines combined. Marginal benefit, not worth the refactor.Test plan
npm run build— 916 pages built in 9.04s, no errors/fonts/inter-latin-variable.woff2returns 200 with the immutable cache header after deploy