You can configure user's Connection Limitation and Data Transfer Limitation here.

Max number of sessions per user account
Specifies the maximum number of concurrent sessions that may be opened from a single user account.
Max sessions per IP
Specifies the maximum number of concurrent sessions that a user may open from a single IP address.
Automatic idle connection timeout
When a client has been idle(No FTP Command) for a specific time, it will be automatically disconnected.
Max download speed per session
Limits the maximum download bandwidth for each individual session. Setting a limit of 0 KB/s means unlimited bandwidth.
Max upload speed per session
Limits the maximum upload bandwidth for each individual session. Setting a limit of 0 KB/s means unlimited bandwidth.
Max download speed for user accounts
Limits the maximum download bandwidth shared between all sessions associated with an individual user account. Setting a limit of 0 KB/s means unlimited bandwidth.
Max upload speed for user accounts
Limits the maximum upload bandwidth shared between all sessions associated with an individual User account. Setting a limit of 0 KB/s means unlimited bandwidth.
Automatic transfer connection timeout (only for FTP protocol)
When a client has been idle(No Data Transfer) for a specific time, it will be automatically disconnected.