Unfortunately there is no realistic vector drawing open source app for MacOS. Inkscape is still basically unusable with extreme lag. LibreDraw is ok for very basic things. But that's about it.
Same here.. I don't use it often, but it is fairly quick on my M2. It did have some mouse focus issues, you have to click around a bit more but that's okay-ish.
You can try Inkscape on Windows! It's the most crashy software I've used. It's crazy because I use Houdini and Blender, both far more complicated apps than Inkscape and they crash less.
(Houdini is the second-most crashy app I've seen, and it's nothing compared to Inkscape at least on Windows.)
I'm going to hold on my Affinity as long as I can and try to integrate as much of my workflow to Inkscape as possible (even if UI feels like CorelDraw). Also keeping eye on: https://graphite.rs/
Pixelmator somewhat fits that (minus the half-assed part). Pixelmator is, at least for now, pay once. And given Apple's size I don't see them trying to squeeze customers for Pixelmator subscriptions. It definitely isn't a full vector program at the level of Illustrator/Affinity. But for a lot of people it probably has powerful enough vector editing.