Well, in the case of some games, doing what is essentially a "Control-S" often will lock up the game or disconnect the game from the internet (if that is the case). In some apps (like 3D rendering apps) I can start a render, and minimize the window. The program is still doing the computations, but my computer fan doesn't blow as low and the CPU load seems to fall a bit. Most of these programs run great in Wine (just as fast, if not faster than in XP), but the CPU usage seems higher. This all could just be my imagination.