Same here. I'm running the game on ubuntu 12.04 Its not-smooth from the start of the game (the menu is smooth of course) It's just me and one enemy (AI) specs: AMD Phenom 9600 Quad-Core Processor × 4 ATI Radeon HD 7850 (VESA: -102) 8GB RAM By the way: Interresting game. Hope to learn to help you with blender