Random Performance Issues

I have been playing rust for about 2 weeks with around 35-50 fps. Last night I turned off my computer normally like every day and went to sleep, this morning I got on and I could only a maximum of 18 fps. I simply cannot play with those frames. I had the same issue before playing rust the first time and I had to use NVidia Inspector for Rust to recognize my video card. I have done everything possible to try to fix this issue but nothing has fixed it. I have tried going to the nvidia control panel and blah blah blah… I have tried to re download my drivers. Nothing has worked… PLEASE HELP ME!!!

GPU: Geforce GTX 960M
CPU: Intel® Core™ i7-4720HQ CPU @ 2.60GHz
Memory: 8.00 GB RAM (7.93 GB usable

I have an nvidia graphics card just to make sure.