Evilnat
Developer
Maybe it is your internet connection or the proper FTP server. You can try to fix the slow issue going to Recovery Mode and selecting options 3 and 4I'll see if it works but do you know what might be causing the slow FileZilla transfer speed and the sometimes slow return to XMB from IRISMAN issues I'm having right now after the freezing issue on IRISMAN was apparently fixed?
Do you have any NTFS partition on the external HDD? If so, maybe this is causing the issue