When the plugins getting scanned for the first time (not second time), it seems the loading and checking blocks the whole message thread, which is ok so far.
The big problem is, for example if plugin number 10 is scanned, but the GUI shows that still plugin number 1 is scanned, the application seems to freeze. There should be enough time between the plugin-callbacks to handle the GUI-updates, so that the user can see the progress, and not thinks the application is crashed.
