I am using an Alienware X51 computer. It has 6G RAM, but I only dedicated 4G to the server. I actually don't know if I did the RAM dedication correctly, this is what it looks like
java -Xmx4G -Xms2G -jar forge-1.12.2-14.23.5.2768-universal.jar nogui
pause.
Also I was thinking maybe the Minecraft launcher was getting in the way of the server because it uses 3G of Ram, but i don't know if it would compete for RAM with the server.
sorry, i'm new to this forge forum stuff and i thought it would quote you after I clicked the quote button. I also don't know how to delete comments.