Framerate Issue(s)

[UnicornsRock420]

We've got a Dedicated VM Host with Linux VM, specs:
CentOS 6.5 installed
8 GBs of RAM:
- 2 GB of which are allocated for a RamDisk for active map data play
- 3 - 5 GB of which are dedicated for FTB Monster/Java usage (min/max heap size)
4 CPU cores dedicated to this VM, specs:
processor : 0-3
vendor_id : GenuineIntel
cpu family : 6
model : 26
model name : Intel(R) Xeon(R) CPU L5520 @ 2.27GHz
stepping : 5
cpu MHz : 2266.747
cache size : 8192 KB
physical id : 0
siblings : 4
core id : 3
cpu cores : 4
apicid : 3
initial apicid : 3
fpu : yes
fpu_exception : yes
cpuid level : 11
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts mmx fxsr sse sse2 ss ht syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts xtopology tsc_reliable nonstop_tsc aperfmperf unfair_spinlock pni ssse3 cx16 sse4_1 sse4_2 popcnt hypervisor lahf_lm dts
bogomips : 4533.49
clflush size : 64
cache_alignment : 64
address sizes : 40 bits physical, 48 bits virtual
power management:

Additonal JVM/JRE CLI options:
-XX:MaxGCPauseMillis=400 \
-XX:+CMSIncrementalPacing \
-XX:+UseParallelGC \
-XX:+AggressiveOpts \
-XX:UseSSE=3 \
-XX:+UseFastAccessorMethods

Situation: For the most part the map runs smoothly. Lately we found a portion of the map (roughly 350 by 128 blocks or so) if you attempt to walk/fly with a jetpack into the chunks of this area, FPS drops immediately to 1 or 0. Trying to restore normality, we used 3 QuarryPlus setups to reduce everything down to bedrock. The choppy/laggy sensation for whatever reason remains despite the lack of anything that would cause this.

Please help, thank you.

 

[psp]

I would try without the JVM arguements first as sometimes they go derpy. Also you could try and run the opis mod. But also you could use a map editor to remove those chunks if you have nothing you need there.

 

[UnicornsRock420]

Will do, I'll give those a try.

As for the Opis mod, it was previously enabled and I tried disabling it to process of elimination to attempt to establish a root cause, no change.

Thank you!

 

[UnicornsRock420]

And it appears the root cause is RotaryCraft. Turn these flood lights off pointing in the opposite direction from this 350 by 128 area and now it's normal FPS again.