List files of FTP very slow


I have a recent issue with my OSMC.
I have a source plugged to a FTP, but when I go to :
Videos > Files > My_FTP
It takes more than five minutes to list files on the FTP server.

But from Filezilla, it’s instant.
And when I add a new network source, and I choose my FTP, it’s also instant.
Just the access from Videos > Files is very slow (scan of database is also very slow)

Thank you for your idea