I just wanna say that I have a similar system to the OP, and that this issue is a HUGE PITA for me and my workflow. I have a frequent autosave set and nothing disrupts the flow more then having to sit 5-8 seconds every five menutes and watch the beachball spin.
It’s really, really, really annoying. Not to mention session sizes are now HUGE - I’m at 42 mb per session. My session backups end up taking gigabytes of storage space.
As trivial as this may seem, it really is making me consider switching back to Logic again. It’s that annoying.