Ever since i updated to the 1.6 launcher, i have been getting HEAVY lag. I can barely walk around town, and i can't go into the wild or nether. Is anyone else having this problem?
Did you both have optifine 1.5.2? If you did, optifine boosts your fps, and 1.6 was just released, so optifine isn't updated. At least, that's why I think your getting a little worse fps.