FTB INFINITY Lag...

[Doppo Astralis]

So i started playing FTB Infinity Evolved, and i have around 150-200 fps, but sometimes i get a HUGE lag spike and my fps come to 10, like everytime that i open the inventory it happens, but i already played huge 1.7.10 modpacks, and 1.12 medium packs, and that never happened. Any help?
Specs:
i3-2120
gtx 1050
8gb ram (4 allocated)
Srry for my bad english, im brazilian

 

[Nuclear_Creeper0]

Maybe allocate a bit more ram, I use 6gb for 1.7.10 and 8gb for 1.10.2+