I really don't understand why you are having the speed / freezing issue, I have over 2000 movies all in their own folders on 1 large regular 5400 rpm spinning hard drives with no issue.
If it was...
If you just remove the Media Sources you will lose the movies.
First copy the movies from the Media Source you want to remove to the Media Source you want to use now.
Then you can tell the...
Yes I would agree name and year should work also but apparently it does not, so use the name + imdb+ number until RoChess is available. It's RoChess's plugin, all Pablik did is adapt it to x64.
I have looked up movies I've added at imdb where there are many movies with the exact same title. It only makes sense to add an identifier of some kind.
Open MP configuration - plugins - right click MovingPictures icon - click configure - exit MovingPictures configuration click OK on MP configuration. Open MediaPortal - open IMDb+ a popup window...
In the attached file you can find x64 recompiled libraries for the StreamedMP skin. Plese note, that you need to have the skin already installed. Just unpack the content into your x64 MediaPortal...