So here's an odd problem I've encountered. I've been playing Regrowth for a couple of weeks now on a server. It's been running passably well for me. I've had to install Optifine and Fastcraft to add options to turn the graphics way down because despite having 4gigs of RAM dedicated to it, I'm still getting like 4 fps on normal render distance and average graphics. With opti and fastcraft, I'm pulling 35-40 fps on average, which is acceptable for me.
I've got a nice base going with some friends of mine and things have been running very smoothly all along up until now. We have an ME system (very simple, just a few drives and a terminal) being powered by a high-pressure steam tank feeding some industrial steam engines. I've recently built a water turbine via mariculture and am tweaking it to get it to work properly. Other than that, we don't have much in the way of moving parts. Just a loooot of magical crops, a smeltery, a blast furnace, and an infusion altar.
All of this ran fine for the last two weeks and for most of today. About an hour ago, I started having my game run really choppy. By choppy, I mean that I would be able to contrl my game for a few seconds, maybe 4-5 seconds, but then everything would freeze for 5-10 seconds before allowing me to move for another 4-5. It wasn't movement: chat was frozen too. If I hit ESC to go to options, my mouse cursor would freeze every few seconds and when I clicked on option buttons they would freeze.
I've had this happen a couple of other times in the last few days, and I responded by closing all the way out of the client to desktop. Upon relaunching Regrowth, things were okay. But this is no longer fixing the problem. I've not only shut down minecraft altogether, but I've tried rebooting a few times. I also updated Java to make sure I'm on the most up to date version. I was running Java 8 update 51 and am now on Java 8 update 60 which is the most recent release at this time. I was also careful to make sure I have the 64-bit version (why the heck do they tuck that away anyway?). I'm running Windows 10, 64-bit. I have 4 gigs of RAM allocated to Minecraft. The RAM isn't what is getting used up though, it's the CPU apparently...when I pull up the ctrl-alt-del menu it shows me getting regular spikes ranging from 50% CPU usage up to 85% or so, and it seems that the spikes to 85% correspond with the freezes in game chronologically. Literally the only processes I have running that take u more than 1% CPU usage are Team Speak and Minecraft.
I've tried launching this in both FTB and MultiMC launchers. I get the same problem in both.
Could anyone offer me a suggestion as to what I should try next?
Many thanks!