User blog comment:SpartanEgghead/Why Beta 24.4 was problematic for many mod players.../@comment-25533095-20150816234716

Here's what happened: as the mod grows larger, it takes more RAM for it to be playable. Now it has reached a point where it needs more than 512MB of RAM to run. For most people, this is not a problem. However, some computers have a function which locks the maximum Java usage at 512MB. There is quite an easy fix for this, and is explained here. But be careful, any minor mistakes while doing this can mess up some important stuff.