[a noob needs help] Weird game-slowness

[FFox]

Not very sure if that is the right place to post this if it's not please let me know where should I do so.

 

So my problem is kind of rare I believe as I searched it and did not find a thing. I was playing regularly when of all sudden I had feeling I am getting FPS drops.. so the server I am playing in has FPS indicator to show your current FPS. It was not moving from 60/61 as usually but indeed they were fps drops. I opened MSI afterburner for better results and saw this: 

As you can see on Framerate, FPS there is a little drop the reason for that is because I had locked max fps to 84 and then changed it to 60 ( the straight line is 60/61 as you can see it is stable AF )

So the fps measurement shows that it is fine but in reality I am getting weird fps drops. Any ideas what may cause this or how do I fix it?

Is it possible that my gpu bottlenecks the game?

Thanks in advance!