Since a few years ago ruining text fields seems to be a rite of passage for front-end developers. I echo the Asana issue and I also noticed Slab (some kind of Notion alternative) both managed to make text lag.
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).