There's a new version of jEmplode prerelease that is substantially faster during the "thinking time" after it reads the database from the Empeg and while importing files from the filesystem (possibly copy-and-paste too, though that's more limited by creating a slew of nodes).
Sadly I was doing a ton of sorting that I didn't need to (I was inadvertantly sorting the soup playlist contents, which is silly since the user selects the column to sort on -- it meant that there were a HUGE number of sorts happening during those operations). Sorry guys
Also in this release is the ability to drag-n-drop M3U files and a playlist will be created that is the same name as the M3U file (actually, this supports nested M3U's too). This is the first step towards reading/writing the entire Empeg contents as a soup + a set of M3U's.
Mike