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…racter getImageData on a font atlas rasterises the whole atlas, and fillCharacter called it for every character drawn, which was most of a card's render time. Each renderer now keeps a glyph's ImageData after the first read, keyed by the character, and drops them when its atlases are reloaded. The pixels are only read, never changed, so output is identical.
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Description: Drawing text read each glyph's pixels from the font atlas for every character, then added a four-point path for every opaque pixel.
Drawing the BedWars card on the M5 went from 4.2 to 2.6 ms with the default font, 7.4 to 3.1 ms with HD, and 11.4 to 4.9 ms with FPack.
Merge order for the perf PRs is in #1002.
Testing:
/bedwars anrielooks the same.Supersedes #1004