Check out this thread, as well as the linked threads on it.
What I have come to find is that I am getting much faster results not using lists of things as a data field…however, that doesn’t mean I am not using them for certain things, especially things that pertain to a specific user. But, things that all users can search for I am not using lists of things…and when a specific user might have more than 10,000 of something, I can’t use a list.
