when I open osu! it takes like 30 seconds to come up. It like darkens my screen a little, then a little, and so on until the game is open then it freezes for like 10 seconds then it works fine. When I alt-tab out of the game it doesnt let me back in. I click on it from the taskbar and from alt+tab and stuff but it shows its open like its highlighted on the taskbar yet it isn't open. Help?