I doubt it, but I guess that's a question for Ashley, as I don't know the specifics.
You could always try a test and see if it improves things, it shouldn't be too hard to implement.
Honestly though, I'm not sure you should bother. Even a .capx with 1 sprite that moves around with 8 direction behavior stutters a bit on my machine (that can play most modern games no problem) in FF, chrome and IE. I have a game I'm making that cyles through like a hundred lasers a second and it doesn't stutter any more than the 1 sprite 8 direction test did. You're probably going to get them no matter what you do until browsers improve.