Hey AMEiDoX,
Sorry to hear about the poor performance. We are not really sure what the hardware requirements are for the game, it ran fine (60+) on a laptop with a 1060 and an i5, so mid-tier hardware should be able to handle it just fine.
With that said, there's plenty of lights which are entirely unoptimized, so it could be that is what's causing the lag on lower end hardware.