In the most recent build that went out today (Build 79291), the crazy mac shadows issue should be fixed. There are more performance and hitching improvements being worked on still. MSAA bugs have been deprioritized and we disabled MSAA on the most recent build until we can get time to solve them. The main MSAA bug is getting some strange colored pin hole lights at certain camera angles on MSAA’ed edges. I think that’s been reported in this thread, though it’s not a mac specific issue. I’m not sure if MSAA will get fixed before Forever ships or not; it depends on how much time other issues take to solve.
It took longer than I’d like to solve the crazy shadows issue. My next things I’m looking into are some water visual bugs on mac and the ongoing rare tint issue.