Isolated the "Slow Pro" problem to what appears to be a slow network problem that has appeared on this computer in the last 3 weeks. Four other computers do not have this problem. Used Tech Tool Pro and checked all six drives - they check ok. I think it may be a problem with software from the MacUpdate Spring Promo bundle, since it was around the time that I installed this software that the problem appeared. Anyone have any additional ideas or know if that promo bundle is the problem? Thansk.