Need help on FPS Issue :( thank you!!

Hi guys

My FPS is unusually low on this game... I have around 20-30 FPS on Medium to Ultra graphics and around 50 for minimum graphic, with a ROG g751JT... The issue gets worse as I enter areas with more graphics and went as low as 1 FPS in a NMR.

I have:
GPU: Nvidia GTX970M
CPU: i7 4720HQ
Ram: 24GB
Windows 8.1 64 bit

My friend has a Lenovo Y50 with:
Nvidia GTX860M
i7 4720HQ
16GB ram
Windows 10

And he runs perfectly fine with high FPS at at least 40 on ultra graphics even in the same NMR I was in...This made me realise I had an issue.

Appreciate any help! Thanks!

Need help on FPS Issue :( thank you!!