When you have thousands of files in the home folder, or use a shared folder (with UNC path) as home folder, the FTP server may take a long time to display the directory content. In that case, you can speed up the listing process by the following steps:
1. Enable the option "Server > Settings > General Settings > Miscellaneous > Enable Directory List Cache".
2. If it is possible, enable the user option "Domain > Edit a user > General > Show files/dirs with hidden attribute".