Would it be possible to work with thousands of physical bodies in SpriteKit?
SpriteKit Performance
It will depend on the specifics of your scene as well as the device you are running on. I recommend that you give it a try, and then if you find that it isn't performant enough in some way, file an enhancement request using Feedback Assistant, and also consider dropping down to a lower level framework (Metal), where you will have the greatest amount of control.
Thanks! It worked great. I realized when adding things like physics to too many nodes it can slow down, but basic nodes I could go to hundreds of thousands at 60FPS without any problem.