That's interesting—I guess it doesn't surprise me, exactly, since FL Studio also seems kind of unstable to me. It is too bad, though, just because its piano roll and automation system are really nice and have some features I haven't seen in other sequencers. It leaves a lot to be desired in other ways but those two aspects of it make it really nice to work with for me.
I tried out Reaper in Windows and Cabbage performance there is better than in any other DAW I've tried so far, comparable to the standalone. I do wonder why that is. Renoise in Windows performs similarly to Live. I'll take a closer look at Reaper and see if it would work well enough for the project I'm taking on right now. [edit: At first I wrote "Reason" instead of "Reaper" in a fit of absentmindedness but of course that's a totally different DAW ]
ksmps set to 32; much larger than that and I start running into trouble with input lag, and sound quality suffers a bit in a few places. I have a setup in the synth where unused modules can be turned on and off to save resources, but I haven't worked the channel reading into that yet. Right now I'm testing it with everything on though, since I want to make sure it will be functional even with all its most expensive settings enabled. I'd ultimately like to release it to the public, so I want to make sure it will just transparently work for people, unless they're trying to do something impractical like play 20 notes at once or something.