Board Thread:Questions and Answers/@comment-90.217.74.246-20121227170022/@comment-24.18.8.160-20121228040016

650GB sounds like harddisk space. You need more RAM. in particular, you need to allocate more RAM to minecraft/tekkit....your launcher SHOULD have an option to increase this. But  If you can't allocate more ram to minecraft/tekkit, try the following:

1. render->tiny.

2. graphics->fast.

3. animations: all off.