Attach to running application dialog takes time to be displayed

When user wants to start a debug session, by attaching to a running application, the dialog that displays the list of processes takes a long time to be filled.

The dialog is opened, but is blank for a couple of seconds (~5 seconds).
Same thing when the user clicks on the Update List push button, the dialog freeze for a couple of seconds before being refreshed (~5 seconds).

This was not the case with older versions of QtCreator, on the same system.