Comment 1 for bug 186908

Using default thumbnails also has it's down side in that it takes more CPU cycles away while the thumbnailer thread is attempting to create thumbnails.

We will have to do some prototyping to determine what the best approach is, but the end result needs to be a smooth user experience.

NOTE: One small twist on this approach would be to fill in the view with a very simple thumbnail, and then have the thumbnailer thread only work on thumbnails that are currently in view.