I don't know why, but occasionally my game likes to reprocess all my beat maps right after I open my game. This gets really annoying because I have a lot of them and it takes forever to finish. How do I fix this?
Close osu! and move osu!.db file outside of your osu! folder. Run the game and let your beatmaps reprocess once. Hopefully, after that your osu! won't need to reload maps everytime you open it.