Low FPS bug [SOLVED]

I used to have 50 FPS, now I barely get 10. Started today whan I spawned a second car. Cleared cache and deactivated mods.

 

Specs?
Edit: It's a graphics issue, CPU is doing fine. Check GPU load and temps.

 

GeForce GTX 760 (192 Bit)
Intel Core i7-4770 @3.40 GHz
12 GB DDR3

 

We got same gpu iam running an i5 so the gpu fine how are the temps and do you have any thing running in the background

 

the 700series tends to have weird behaviour mine did it as well 750ti sometimes i could run everything maxed out sometimes the same games wouldnt even run properly with lowest settings

 

That probably was it, suddenly works fine now...Thanks for your help.
--- Post updated ---
Forget that, the FPS drops when I change the vehicle :\

 

Check GPU clock, load and temps while playing. Use MSI Afterburner or other overlay. Post results.

 

I have never overclocked anything, wanted to, but didn't do it because I thought I could damage something.

 

Here you go:

--
Fixed it
I (somehow) fixed it. I opened and cleaned the PC the first time after 2 years, now it works again. The CPU cooling was full of dust. Anyways, thanks for you help, all of you, and I hope you didn't waste too much time on me

 

This is why cleaning things is important... lol