Ever since updating to the latest version of iTunes on my dual core mac mini, iTunes can only perform one task at a time beach balling the entire time. For example if it is downloading a podcast, and I try and watch something off my apple tv via home sharing on this library, it fails to load. Same thing if it is syncing my iPhone.
Importing new media into my library also seems to take much longer than it did before, for instance importing a 700mb movie takes ~20 hours.
What can cause such a degrade in performance?