I have a MacBook 2.2 GHz with 2 GB ram installed. I've read that my "mds" Spotlight process is using too much memory. Mine uses about 150mb - 250mb at any time. I've heard that others' use about 8mb. Also, my VM size is constantly at 50gb. I've heard of people's at 8gb. This makes me worried. Are these things I should be worried about?