Performance deficience! And this time is serious!

Last week, I sent an issue saying that the game performance decreased seriously. However, you said that the fault was of my PC. But it isn´t: My game is running at 5-30 fps, BUT my graphic card and my processor are not using the 100 % of their power! And the fps limit is at 60. Please fix it, it is NOT the fault of my PC, because it runned MUCH more better before 1.15