It's like having two viewports, which can kill the graphics with the same settings, that's why splitscreen games look so bad. The physics and everything just runs like one game though.
Just did a little digging around in the game files (while trying to find crash logs) and im not sure if it is something that Torque3D auto-generates but i found this: Take it with a pinch of salt though. @Kamil_ Gratz on 700 posts