I would like to have more FPS in Minecraft because I want to use replay buffers, but I don't know what to change in my setup.
I have 8GB Ram.
A Radeon RX 580 Series GPU.
An AMD Ryzen 5 2600 six-core processor.
What do I need to upgrade?
Minecraft is a very CPU-demanding game. Ram and Graka are easily enough here
First of all I would try the Mod Optifine
If this does not or does not help sufficiently, upgrading the CPU (processor)
How much fps do you have and how much do you need