To access NFM's Advanced Options click on "Advanced Options" on NFM's interface.

Thread Priority
This allows you to specify NFM's thread priority (ie: how much CPU it uses). For slower systems a lower thread priority is recommended.

Debug Mode
When debug mode is enabled NFM will log technical messages to the Activity Log that help in diagnosing logging issues, connectivity problems, and more.

Log Location
This directory is where NFM will store all its activity logs. All activity logs are stored in a subdirectory titled "NFM" within this folder specified. The default log storage location is the documents and settings\all users\application data\ folder.