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Léo
c2b9666def
The app font faces are declared in static/style.css, so the browser only discovers FiraCode-Regular.woff2 and FiraCode-SemiBold.woff2 once the stylesheet has parsed. On a cold load they start about 145 ms in, behind the module graph. font-display: swap keeps that from blocking render, so the cost is a visible swap rather than a stall, but the fetch can start immediately instead. Two preload hints move the request into the head. Measured cold on a scratch instance with an empty cache, three runs per arm: request start 142-203 ms becomes 15-19 ms, response end 174-248 ms becomes 46-63 ms. The total request count is unchanged and each face is still fetched exactly once. crossorigin is required even though these are same-origin: fonts are always fetched in CORS mode, and without it the preload is discarded and the font fetched again. Dropping the attribute produces four font entries in the Resource Timing list instead of two. Only Fira Code 400 and 600 are preloaded. They are the only faces first paint uses. Inter, OpenDyslexic and Fira Code 300 stay unloaded on both desktop and mobile, with or without a saved font preference.