True, WebDAV has been way slower for me, WebDAV in Windows 10 is available but haven't gotten it to work. It is alright with Cyberduck(paid). Also found CarotDAV.
CarotDAV is a Simple WebDAV / FTP / OneDrive / DropBox / GoogleDrive / Box / SugarSync / Copy / IMAP client for Windows OS, available free of charge.
Portable as well.