Rust is single-threaded, you are probably hurting performance by running 2, and those CPUs are old af. Make sure they are running the RAM in triple-channel.
Get an SSD if you don't want your server to lag like cancer everytime it saves.

Hey. As runescape stated above, you should get SSD to startup and do other stuff much faster. And yes Rust is single threaded mostly so even if you have 1024 cores it will not help, you need a good CPU with high single thread performance.

thanks!