FPS drawdowns in multiplayer on normal iron (Battlefield 1)

Welcome. I understand that the theme is already jaded and has been created a lot of topics everywhere. However, I did not find a way to solve the problem for myself.
The bottom line is that in the multiplayer I observe the drawdown of the FPS. They are usually small. Usually from 70 to 55 or 50 sags. I didn't notice any more. The game and the computer bought recently.
Video card : GeForce GTX 1650
Processor : AMD Ryzen 5 2600
Motherboard : B450M H
Operative: 2 dies of 8 GB, HyperX Black as something there at 3200 Mrz.
The only thing is, it's not SSD and the hard-left is old.
The system, in theory, should pull everything on the ultras. Okay, God is with them with the ultras. It sits even on the average!
I am grateful for my help in advance. It's a shame it turns out, the PC to collect and play with drawdowns.
P.S In the battlefront 1 such problems are not noticed on high settings.