I have a very large library, nearly 1TB and 80,000+ songs. One recent iTunes upgrade (11.0?) basically disabled the search function and I had senior support and engineers looking at the problem for over a month. I never got an answer. Then they came out with an upgrade, 11.0.1?, that seemed to fix the problem. But I'm back to having the same problem, though not as bad. One odd thing - searching with anything starting with the letter "T" rarely works. All I get is the spinning ball. With almost every search, I get the spinning ball for up to 30 or 45 seconds... sometimes, as with T, the ball disappears but doesn't do the search. Is it possible this is a memory problem? I have 8GB and you I would think that's sufficient and a third party utility tells me I have half my memory available.