Low FPS and stutters make the game unplayable

Even the main menu suffers from low FPS and stutters. I’ve tried to run the game at the lowest possible resolution with the lowest possible settings and even then I’m having trouble entering the first house, let alone kill the first enemy.

**Steps To Reproduce:** 
Simply play the game
**Images / Videos:** 
**Host or Client:**
**Players in your game:** 
OS : Windows Seven Home SP1
CPU : Intel Core i5-2500K CPU @ 3.30 Ghz
RAM : 8 GB
GPU : NVIDIA Geforce GTX 1080
GPU drivers : 419.67