Why does Minecraft lag for me?

Okay so before the new minecraft launcher came out awhile back, my minecraft ran perfect and smooth no lag at all, then the newest launcher came out and it lags pretty bad. I could run it at the far render distance and have no problems, now the short render distance with the newest launcher still adds some lag, and I have no clue what I can do about this. When I launch minecraft and go to my profile, I run my JVM arguments at -Xmx3072M -Xms1024M. Also my laptop I'm using has 8GB of ram, its an i5-3230M 2.60 GHZ. Is there anything I can do to at least help my lag, please let me know thanks!