Asana uses ProseMirror and Slab uses QuillJS, and neither of them lag by default if you look at the standalone libraries.. so :shrug: If you have free time, I'

Asana uses ProseMirror and Slab uses QuillJS, and neither of them lag by default if you look at the standalone libraries.. so :shrug: If you have free time, I'd pop open Chrome Dev Tools, run a performance monitor on both and try to diff out what each of those products do that cause the additional input lag (if there's no code obfuscation).