>>Try using it on a machine with a weak processor;
> The weakest CPU I currently have access to is my oldest laptop with a 2.0GHz Core2 T7200. Dragging files from the collection browser to the playlist is smooth as silk on it. Exactly how weak do you want it to be?
An Atom running at 1.66GHz, because that's the processor in my main desktop machine.
It's happily capable of my other non-demanding activities like web browsing and playing 1080p H264 video, which one might expect to be a more difficult task than smooth drag-and-drop.
(NB: I don't really care though, since I switched to Clementine as soon as I heard about it, and I'm extremely happy with it; just wanted to point out that not all slowness can be attributed to additional features.)