Massive lag, despite low system load

Around 15gb of ram is usage is stated in the mod screen, same in task manager, out of 32 total. Cpu usage is always around 25%, gpu around 40%. Despite this, i get 30 frames usually and if something happens (like boss battles or so weapons attacking) it drops up to 1. I don't understand what is happening, i do have about 70 mods turned on, most of witch are small. Why doesn't the game utilize more computing power? Is there any way to fix this?
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