I am in the process of trying to spin up a Skyfactory 4 server using the server files that can be downloaded from Curseforge. I've got the server running just on localhost for now, but when I connect with my own game client, the performance is pretty atrocious. I can't fly my character around in creative without rubber-banding and the server's console gets spammed with the following message:
"Can't keep up! Did the system time change, or is the server overloaded? Running xxxx ms behind, skipping xx tick(s)"
I'm running the server on a Windows bootcamped Mac Mini (LOL) that has an Intel Core i7-8700B CPU clocked at 3.2GHz with 64gb of DDR4 memory. I've dedicated 12gb of memory to the server.
In my eyes, it shouldn't be a hardware issue as I'm running both the server and client on the same machine for testing purposes, and Windows resource monitor is only reporting a 30-45% average load on the CPU. I'll admit, though, that I don't have a lot of experience hosting Minecraft servers, much less modded ones.
Any insight into my issue would be fantastic, and I'm happy to provide anything else that may aid in troubleshooting.