You can control a user's maximum transfer speeds at the Site, User Setting Level, or per user.
The Site level sets the limits of the User and User Setting Levels.
To configure maximum transfer speeds at the User and User Setting levels
In the Administrator, connect to the server, then click the Server tab.
In the left pane, click the user or User Setting Level that you want to configure.
In the right pane, click the Quota tab.
Select the Max transfer speed check box, then specify the maximum transfer speed (in Kilobytes per second) the user is allowed.