I was getting single player lag so I decided to re-install minecraft, fresh install, new map, boosted -Xmx argument to -Xmx4G and I'm still getting block lag (blocks reappearing) and general lag, sometimes things freeze and then progress. I'm getting between 200-400 fps.
I can max out all AAA game titles at 1080p and they run smooth, but not minecraft...you would think with all that money they could hire someone that could code.
The funny thing is that if I revert it to 1.5 or earlier the is no more lag. It all started when they changed single player to run like a sort of server. I'm guessing there are some setting I need to change.
Specs:
Win 7 64bit
Latest Java JRE
i5 2500K @ 4.5Ghz
16 Gigs of RAM
AMD R9 290x video card
I still get some lag spikes when i do that(goes from 100-200fps down to 28 fps. so probably 1.8.1 is coming out to fix this or optifine