I run a Forge 1.21 server for 10 friends on a Fujitsu Primergy RX300 S5 server with 64GB DDR3 ECC RAM and two Intel xeon L5520 with 4 cores and 8 threads each. The Minecraft server has two mods: Spark and Voice Chat. Here is the link to the Spark profiler: https://spark.lucko.me/DQvlXd6aqv I tested the server with 1, 2, 4, 8, 10, 12, 15 and 20 GB RAM on different settings but always when there are more than 3 players on the server, I get the error message: “Is the server overloaded? Running (up to 100,000) ms and... ticks behind." I searched for a solution for many hours but nothing helped me solve the problem. I hope you can help me.