i5-2500K
8gb ram
560ti
1080p
I'm running everything on low and still getting poor performance. Usually in the 30s-40s and it stutters. Sometimes it dips into the high 20s. I know I don't have the best rig, but on low I should be getting better performance than this.
Something is messed up on your system.
I have an i5 760, 12GB ram, 560ti, running at 1200p, and get an average of 50-60 FPS with drops to 30 fps at the lowest, and my settings are at Medium textures, Low shadows, high everything else.