I'm surprised it made such a difference, to be honest.Yeah so am I. I think it's because of how limited it was. With windows 10 eating over 4GB of RAM it only had about 3.7GB to play with before, and now it's using 5.5GB.
I also don't get why my CPU is doing less work now. It used to be matching the RAM with being at 90%+ on task manager but now it's running the game at around 60%.