Why low FPS on average PC?

Question

Video cards

FPS is two to one and a half times less than it should be.

Radeon RX550 4gb
AMD Ryzen 5 1600
8 GB

Answer 1

Solved the problem by inserting a second bar of RAM

Answer 2

* drivers (the time is now such that choosing a version is a headache, the latest for old hardware can be very suboptimal)
* operating system (in pursuit of drivers, it may turn out that win7 or win8.1 will be the best choice)
* screen resolution (maybe you 4k trying to run)
turn off the antivirus, you never know what it does, I also saw a situation when people tested the system during its background update, especially when they just installed the system and it updates itself in the background for days and you can’t understand why everything gets up like a stake