Slow down problems on SF V at 60 fps

So even when i’m playing single player, i get constant slow downs on this game, my FPS are always at 59.5-60, i’ve never seen the game drop below that, and my CPU/GPU use are at less that 50%, i dont have overheating problems either, any ideas what may be causing this slowdowns?

I already tried the CPU affinity fix (deactivating the CPU 0 in the affinity setting) and the activated the “Prefer maximum performance” setting of the Power management in the Nvidia control Panel and still get those slows.