It’s funny you mention your first skills (basic skills) are just filler because this season some of the meta builds use basic skills as the main damage dealer so you don’t need to even think about resource regen as they don’t use it. Rogue and Sorcerer both have their best builds use the basic skills and work around them. There’s still a lot to be desired with balancing and endgame but I feel they are turning things around gradually.

It does seem to be tied to how much you’ve done during a playthrough. It used to crash every hour or so for me and loading was sluggish. Since I’ve started new game plus I haven’t crashed once and loading is much better.