I have a computer that I built myself about a couple of months ago. I have an NVIDIA GTX 680, an intel core 15-3570k CPU running at 3.4 GHz, and 16 GB of RAM. I run on Windows 7 Ultimate x64, and have all my drivers up to date. I can run games like Far Cry 3 and Grand Theft Auto 4 at 60-120 FPS, and even ARMA 2 at 60 FPS at maxed out settings. I can run Minecraft at over 300 FPS, but after about 5-10 minutes (this is the average time sometimes it's shorter, sometimes it's longer, but this it what the time is normally) the FPS drops to zero, then starts fluctuating every few seconds between zero and 120, usually staying around zero. I run a few mods, which consist of REI's Mini-map, Forge Modloader, and Optifine. My settings are, at the very least normal render distance, fast graphics, smooth lighting: off, GUI scale: auto, advanced openGL: off, performance: max FPS. For those familiar with Optifine, I have multi-core chunk loading, fog: fast, smooth FPS, smooth world, and lazy chunk loading turned on. Whenever Minecraft runs, I can hear the fans in my computer going really fast. I think what's happening is Minecraft is taking up too much of my CPU. The only other thing that I have ever had running at the same time as Minecraft would be Skype to talk to my friends, but again, it's fine for every other game I own. Why is it for Minecraft, my FPS is terrible after playing for not that long. I'm hoping that people here have a better understanding of computers and Minecraft than I do.
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no it was doing this even before I installed optifine, but I'll try it and get back to you.
I tried that, and after about 10 minutes, it went down to zero frames again.