Whenever i try to play tekkit or hexxit i get alot of stuttering and some lag spikes here and there,this happens everywhere in the game from large forests and mountain areas to open plains.Every few secs in the game i get small stutters. I dont have any stuttering issues when i play tekkit classic.My fps is really smooth but the constant stuttering and random spike is really starting to kill my fun with these mods especially after finally getting them all textured with Sphax. Ive already done alot of performance tweaking (defrag,CCleaner,setting computer settings to high performance,setting tekkit to high priority in the task manager,trying optifine,as well as tinkering witht he video settings for hours,downgraded to 64x sphax, increased my RAM allocated to the technic launcher by 1 gb) and have installed Java 7 update 60 64bit but none of these seem to have made any difference.I mean between the stuttering my FPS is pretty good.This is all in single player BTW i only play single player.
My comp specs are
AMD Phenom II N640 Dual Core Processor 2.90 ghz
64 bit operating system
5.74 GB of useable RAM
ATI mobility Radeon HD 5470
Technic has 2 gb of ram allocated to it and i only have optifine on Classic as ive unistalled them from hexxit and tekkit after they dint give me results
this is all i know,hopeully this info is enuff
any help would be greatly appreciated as this is the only thing keeping me from playing these fun mods