Whenever I try to generate a new, or load an old singleplayer world, it gets stuck at "Building Terrain", I have left it run for a half hour, and it never manages to load the world.
When I try to connect to a multiplayer server, it connects fine, however it has TREMENDOUS lag. It also tends to crash randomly with no error, straight to the desktop.
Things I have tried:
-minimizing all in-game options (render distance, smooth lighting, etc.)
-allocating more RAM (incrementally, 5GB was the stopping point)
-reinstalling tekkit with a clean launcher and .technic folders
-reinstalling java
-relocating and arranging tekkit files to be launched with the vanilla MC launcher (results in "a java exception has occurred" error when I attempt to launch).
Error log:
I do have a legitimate copy of minecraft (two actually).
This does not occur with tekkit classic, voltz, hexxit, hack/mine, or vanilla minecraft. It DOES however also occur with the yogscast Moonquest pack.