CycleCloud comes configured for starting small to medium clusters (up to 8000 cores). For larger clusters, or for multiple clusters, the performance can be improved with some changes: – Set the web server heap size in $CS_HOME/config/cycle_server.properties to more than 2GB, up to about half of the available RAM on the instance. Setting it to more than 8GB may not produce any benefit. – Set the broker heap size in $CS_HOME/config/cycle_server.properties to at least 500MB, and 1GB if possible. – Change the maximum number of file handles (Linux) or TCP socket limits (Windows) to be twice the number of active instances you expect. Note that this typically requires an OS reboot.