Hexxit Massive FPS Drops

[theodoremk]

Sometimes Hexxit decides to start going crazy. I'm experiencing 0 FPS after about 30 minutes of playing. My memory usage when it starts happening is at ~50% allocated memory (47%, 42% and 55% on three different trials), and my total memory usage is at ~75%. I'm pretty sure it's not a memory issue (or maybe it is, I don't know much about computer software). There are also few entities around my place and my render setting is at normal. I'm leaning toward mod conflict, but I'm still not sure.