Horrible performance

Do I really need a megabeast PC with liquid nitrogen cooling to run a 2D game without stutters and low FPS? Come on, 0.7 was bad enough, but the low FPS only happened when playing with 10+ people in multiplayer, now I get FPS drops even in singleplayer.

P.S. no, I'm not playing on grandma's toaster, my PC can run space engineers, KSP and other games with many physical objects just fine.