Architecting a VMware NSX Solution : Operational Considerations : 11.1 NSX Manager Operational Considerations : 11.1.4 NSX Manager Performance Considerations
   
11.1.4 NSX Manager Performance Considerations
Check that the minimum requirement of four vCPUs is met for the NSX Manager.
Verify that the / partition is not running out of space. You can verify this by logging into the NSX Manager console and typing the command df -h.
Use the top command to check which processes are taking up CPU and memory on the NSX Manager.
If the NSX Manager encounters any OutOfMemoryErrors on the logs, verify that /common/dumps/java.hprof file exists. If the java.hprof file exists, create a copy of this file and include this with the NSX Tech Support Log bundle.
Verify that there are no storage latency issues in the environment. Attempt to migrate the NSX Manager to another ESXi host as part of the troubleshooting. It might be worthwhile to confirm that the NSX Manager virtual machine appliance is not running on snapshot.