I have found the best FTP Client with Auth TLS support which can work with Pure-FTPD of ISPConfig 3. If you set its number of concurrent connections to 10, it is faster than CoreFTP LE by 50% less time. But you must use Firefox http://fireftp.net/ FireFTP is a free, secure, cross-platform FTP/SFTP client for Mozilla Firefox which provides easy and intuitive access to FTP/SFTP servers.
