actually you might get worst fps, when you have no video card or it's not working, it's usually the bios that handles displaying, which is incredibly slow due to no hardware acceleration. But, cpu doesn't get in the way for this, while with a graphic card needs to handle something with the cpu. Though this part is only speculation
10fps @ 50 000 with a broken cpu (Pentiumd D, the first dual core. Two individual CPU in one, not just two core, and one core is broken)
This remind of the program I made resembling this, except it would add actors automatically and delete them afterwards, and tell you if you have a good computer or not! There was suppose to be a function that writes to a file too