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Thanks Ash.
But this dont help, i use all my ways for reduce the fps problems and the FTB is slowest than MultiMC, i have 8gb RAM with 4 allocated and the game only use 2,5.
Try adjusting video settings with Optifine or set a priority to Java in Task Manager or setting less RAM. Oh and it might the amount of mods because MultiMC installs the mods when you add them and FTB re-installs them when you play a modpack.