Why does Unreal Engine 4 runs so poorly on my system?

Hi, so far every game that I’ve played and was made with Unreal Engine 4 runs HORRIBLY on my system… Is not a High end gaming PC but it does manage to play Witcher 3 at sort of highest setting and also other games, but the problem is with games made on Unreal Engine 4: Hatred, Alone in The Dark, Fractured Space and most recently “Enki”. All of those games runs 5-15 fps. Any other game runs great. Maybe it’s because most of them are indie games and are not professionally optimized. I dont know

My system spec (pretty crappy but does its work):

  • Operating System: Windows 8.1 Pro 64-bit
  • System Model: Gigabyte GA-A75M-UD2H
  • Processor: AMD A6-3500 APU with Radeon™ HD Graphics (3 CPUs), ~2.1GHz (I think can be the causative of the problem)
  • RAM: 6144MB RAM ( @1330 MHz)
  • DirectX Version: DirectX 11
  • GPU: NVIDIA GeForce GTX 660 oc (From Gigabyte 2GB VRAM)
  • nVidia drivers: 353.62

That’s all, hope I can get some help. By the way, I do have the Unreal Editor and it does work great, tried sample levels and they all run great.