Dropping below 120 fps on decent PC

So recently I’ve purchased new PC so I can finally have a nice streaming experience.

However, my FPS drops below 120 fps sometimes and just stays around there for a while, until I restart the game.

My rig:

CPU: Ryzen 5 1600x
GPU: RX 580 8 GB
RAM: 8 gb ddr4 3000 MHz
MOTHERBOARD: b450 aorus M
SSD: 120 GB Kingstone

Can someone help me? I cant seem to maintain stable 200+ fps on Low settings with 1366x768 resolution. Also, I should mention that I actually get fps increase if I increase quality of the game. Low settings seem to drop my FPS significally.

I have the same issue. I can’t even keep a straight 60 fps.
My PC
CPU: Intel i5 8400
GPU: GTX 1050 ti
RAM: standard 8B
MOTHERBOARD: ???
HDD: 256GB standard m.2280 (I think)
Moniter: 1920x1080 60htz
And I play with everything turned down to low or off.