I have an almost identical setup as Scott (MacPro 6 Core) and have the same issues. I would expect AVCHD to bonk but I still have playback issues with ProRes.
Truth be told I have not heard anyone, on any forum, anywhere, actually state that they have a smooth editing experience with Resolve thus far.
Joseph and John- are you guys actually able to edit smoothly or do you not really delve into editing that much?
And that goes to everyone- can you actually start and finish an edit? What’s your rig?
Do tell!