When I click on the Add button on the Files panel, it takes a long time (e.g., 15 seconds or more).

Make sure that all of your connected servers are up and working. JExpress uses Java's JFileChooser which checks for all the files on your system. A bad network connection can really slow the system down.
Applies to
3.0 or later
adding files, NFS, JFileChooser

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