An even faster tri fill using stamping. If you want to visually see how it works check out my Geogebra applet here: https://www.geogebra.org/m/v6jxhmx7 For instructions on how it works please see inside.
@ChromeCat_test has an excellent tri-filler that is wicked fast, for Scratch anyway. But I came up with some ways to make it even faster: --Differences-- ~changed all vector costumes to bitmaps for faster rendering ~replaced frequently used custom blocks with their definition in all uses These optimizations may seem odd, but it has to do with the way Scratch works. Scratch must parse the code more when you use custom blocks, causing them to be the source of some overhead inside of long loops. Bitmaps are simply faster for Scratch to render.