Pretty sure it has to do with tile entities. The server has 8GB allocated to it, it's a 32GB system, Like I said it's not an issue with load on the system, CPU/IO/BW is all under 20% utilization, memory isn't maxed out. It's the base java startup with the three GC parameters.(-XX:+UseConcMarkSweepGC -XX:+UseG1GC -XX:MaxGCPauseMillis=50).