font-display periods are the CSS Fonts Level 4 recommendations (block about 3 seconds; swap and fallback at most 100 milliseconds; fallback's swap period about 3 seconds). Browsers may use other timings. The waterfall timings are illustrative, not a measurement.brix_sans.css was 2,116,306 bytes, uncompressed, render-blocking, sent with Cache-Control: no-store, and held six Brix Sans fonts as base64 text. This site's IBM Plex was measured on Image Performance the same day: seven files, 414,288 bytes on a first visit, none on the next.