Normal
My early 2011 MBP has no problem running TPA onto a Thunderbolt Display full screen with Anti-aliasing at 8X and post processing on for those tables that it doesn't over brighten. I have never seen a difference with immediate mode on or off so I leave it off. The fan comes on, but doesn't quite go into high speed and I keep the computer closed in a cradle. The only time there is a slowdown is if a notification comes on the screen from a program in the background. It is well documented that running in windowed mode will kill performance.