So would this cause lag spikes? I've been having this issue since v6 of the MindCrack pack. I honestly don't quite remember if it happened before... I didn't notice at least. Now, I get lag spikes fairly frequently that last for a second or two and it's extremely frustrating. Java is up to date, and it is the same case with and with out optifine. I have no idea what is causing it and I haven't been able to fix it. If anyone has a fix that would be great. I get on average 60 - 70 FPS, but then the spike hits and it drops to 1. This happens regardless of how big the world is or how many machines I have running.