Hankt

Re-read that. During gameplay, it can get to 50%. I am running Java 64 and minecraft server has been multi-core capable since 1.14. Before optimizing java settings, it would get as high as 80 odd %. I ran this setup on Ubuntu on an older Acer Aspire laptop with the 1.67ghz Intel Duo with only 4gb of ram and it screamed. I never saw the "server is behind xx ticks" message. I didn't have all the config flags running that I do in Windows and memory settings were 512 and 2048 Either there is something missing or the overhead of Win 10 is a bottleneck to achieving better performance. Next up, my original question, are these parameters valid for server.jar?

It sits at 14-18% at idle and up to 50% during game play. It could be CPU, but there is nothing else running on this machine.

Are these arguments valid for the minecraft server.jar as well? I am trying to optimize a home based server setup for my daughter and her friends. It is running on an Intel core duo core 2.2ghz processor with 8gb ram. There are never more than about 8 kids playing, but the stutter and rebreaking the same block lag are annoying. The machine used as a server is connected to the internet using fiber and network traffic is small. Current command line: -Xmx4G -Xms4G -Xmn96M -XX:UseSSE=3 -XX:+UseG1GC -Dsun.rmi.dgc.server.gcInterval=2147483646 -XX:+UnlockExperimentalVMOptions -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M -XX:+AggressiveOpts -XX:SurvivorRatio=16 -Xnoclassgc -server -jar server.jar nogui