@debianlinux I think it randomly chooses albums from genres that are shared in collections. I asked him about that. I noticed it changes every time I've compared collections. Feel free to share any ideas you have for improvements, I'll pass them along. He's making it for fun.
@Bohnjaggs It shouldn't take any more than 15 seconds. Usernames are case-sensitive. You can't search just yourself.
Also, leaving one box blank will not yield results. This includes if you click "Add Another User" once or twice, enter two (or three) Discogs usernames, and leave one of those added boxes blank.