Starsector defaults, i'm almost as baseline control of a player as you can have.
As to streaming, i max out the FPS on the regular, plus it's NVENC hardware encoding on the GPU side, not the CPU.
LE: In settings i see Battle Size set to 500, though i'm certain i didn't touch it. O.o And SS does a full delete/reinstall of core files each install afaik, so that has to have been changed manually post 0.9a RC10? Blargh.
LE2: Fresh installed on another computer, the Battle size is set to 200. Did a few saves/loades/battles, and it stuck to 200. (also is music supposed to start out as 0% and sound to 100? pushing 'defaults' set them both to 100 and battlesize back to 200, weird but notable).