Try to match GPU cycles to the CPU

Makes Fat Princess a lot faster.  Tried to go with educated estimates on cycles.  Also had to move away from threadsafe events for now, arg.

Rationale on the estimates is, the GPU is clocked at approx. 1/2 the CPU, so double.  Wikipedia says it can handle "up to" ~33 polygons per second, but the lists in Fat Princess get executed 4x if I go with 10 (166/33 * 2.)  80 is approximately where it seems to execute just once, roughly.

But it's still a complete guess.

Fixed the issue with FF1, so I'm hoping this'll work well.  May improve #862.

-[Unknown]