Minecraft Forums

I've had this problem where if I break a block, minecraft will freeze for a split second. If I place a block, it tends to place 2, 3, or even 4 blocks. I'd like to know what's causing this, and if there's any fixes.

Let me get one thing clear, this is NOT a mouse issue. I've tested this with several mice, and it still happens.
In the Debug screen, when I break/place a block, there's a lag spike (it goes from low green to High red for about 1 pixel.)

Computer Specs (Not Great)

Pentium® Dual-Core CPU T4200 @ 2.00GHz
RAM: 3.00GB
Windows 7 64-bit

Thanks.

This is in both multiplayer and singleplayer. It happens more in multiplayer, but doesn't happen as often in singleplayer.

I thought I mentioned that I had OptiFine in my original post, I guess not. xD

Optifine did help me with FPS, I was getting 10-15 and now I get 40-50. But I still have this block placement lag.