Suggest you try this (it is a great tool): Go to versiontracker.com and find, download and install "applejack." It has directions along with it, but the simplest thing to do is to restart )reboot) with CMD-S held down, and when the "fine print" stops, enter "applejack AUTO restart" and hit Return. This will perform a deep cleaning of your system. For a regular cleaning, type "applejack auto restart". I just did it because my browsers had slowed down to a crawl once again. Now, they are snappy. --Steve