Using CDC (Clear Data Channel) speeds up transfers with SSL sites. A clear data channel encrypts the connection process, but files are transferred without encryption. You can add more speed to your transfers by using a clear command channel as well.
Click on a site in the Site Manager.
(In CuteFTP Home, skip this step) On the menu bar, click File > Properties. The Site Properties dialog box appears.
Click the Type tab.
In the Protocol list, select FTP with SSL (Implicit encryption), or FTP with SSL (Explicit encryption) or FTP with SSL/TLS (AUTH TLS).
Select the Clear Data channel check box.
Click OK or Connect.
The Clear Data channel option is only available with SSL connections.