I think they are referring to this section: https://chevyray.dev/blog/creating-175-fonts/#automatic-kerning https://chevyray.dev/blog/creating-175-fonts/#automa

I think they are referring to this section: https://chevyray.dev/blog/creating-175-fonts/#automatic-kerning https://chevyray.dev/blog/creating-175-fonts/#automatic-kern... In this case they are not using async but Rayon which provides some easy primitives for splitting tasks into smaller parts that can run in parallel. In this case the par_iter and par_extend calls.