As I have been playing, I've noticed that after running the game for some time (maybe an hour or so), I start to experience large performance drops that eventually make the game unplayable. The performance issues are only fixed once I restart the game; it reminds me of some kind of memory leak issue, but I don't know. I've also experienced some crashes, usually right after I complete a quest or fight, and there's a lag spike while I quick-save the game. The save goes through, but the game crashes.