I'm running Mavericks GM on my 15" rMBP and see that the OS is not switching to discrete graphics as much as Mountain Lion used to. These are cases where the laptop is plugged in to a power outlet. 1. When running Facebook in Chrome the graphics card does not switch. 2. I launch Windows in Parallels 8 and start up a game and the card still doesn't switch. In 10.8.5 i noticed the discrete card was in use most of the time when the laptop was connected to a power source. Anyone know if there is a setting to change this behavior? Do other folks observe this difference too?