I'm on a mac, I have an average of 20-30 fps on a good day. I decided to test this shader out (After asking Neo_Exdeath if it was okay). Pretty much no change in fps, with the occasional lag spike, but who knows? That could be due to pretty much anything. There are a few glitches here and there, but otherwise this shader is breathtaking. I was having issues with that and the Better Grass mod, where the sides of the grass blocks were gray-colored instead of green, so I've taken it off for now, until I find I'm bored enough to try and fix it.