Minecraft FPS problems?

[Freeforall]

Okay, I know my computer is strong enough to play this game. I use a 64x64bit texture pack, and I average around 50-60 FPS with smooth lighting. But every 3-4 seconds or so, it will pause, and then keep playing like it should. It's really bothering me. Why is this happening? It doesn't look like normal FPS lag.

[Freeforall]

Sorry for double post, but it's been 3 days and I really need someone to help me with this. I tried setting the priority to (realtime) and it crashed my whole rig. xD What should I do?

[Infection]

Sorry for double post, but it's been 3 days and I really need someone to help me with this. I tried setting the priority to (realtime) and it crashed my whole rig. xD What should I do?

Well, without any knowledge of Minecraft's FPS solutions, I do know Realtime is never the best choice when setting priorities. Always check it to high, not real-time. Like you said, realtime crashes your computer most of, if not all of the time. (My experience.)