Ok, so I just noticed that Minecraft 1.3.1 came out, so I went to go play my old world. My laptop doesn't really run well with Minecraft, it produces lag with just Minecraft alone, a little lag with Game Booster, and the same when I set Java's priority in Task Manager to high, but I can still manage it. Previously in Minecraft 1.2.5, I used Optifine to speed up my game, I used the Smooth edition (at that time, I didn't know I had a multi-core laptop). With all my graphics set to low, minecraft ran well. But even though, after I loaded a world in Minecraft, and play for a few minutes, Java just freezes. I can't move at all, the screen is just frozen. The music still plays but I can't move at all, so I have to hard-close Minecraft. This is getting annoying, this happened when I used Optifine on smooth edition in 1.2.5, and it happened this time in 1.3.1 with no mods at all.
DX-Diag
Operating System: Windows 7 Home Premium 64 bit (6.1, Build 7601)
System Manufacturer: Acer
BIOSInsydeH2O Version 1.07
Processor: Intel(R) Pentium(R) CPU P6200 @ 2.13GHz (2 CPUs), ~2.1GHz
Memory: 4096 MB RAM
Page File: 1964 MB used, 5567 available
DirectX Version: DirectX 11
