This statistic shows FTP bytes/sec requested by clients to the appliance. Various useful breakdowns are available: to show the client, user and filename of the FTP requests.
FTP bytes/sec can be used as an indication of FTP load, and can be viewed on the dashboard.
The best way to improve performance is to eliminate unnecessary work, which may be identified through the client, user and filename breakdowns, and the filename hierarchy view. It may be best to enable these breakdowns for short periods only: the by-filename breakdown can be one of the most expensive in terms of storage and execution overhead, and may not be suitable to leave enabled permanently on appliances with high rates of FTP activity.
These breakdowns can be combined to produce powerful statistics. For example:
"Protocol: FTP bytes per second for client 'phobos.sf.fishpong.com' broken down by file name" (to view what files a particular client is accessing)