After months of safari being unusable, and generally all of my browsers being terribly inefficient and painstakingly slow, and trying just about all of the solutions, I have finally found one that worked. Uninstalling Cisco AnyConnect VPN Client from my machine, seems to have fixed my internet browsing issues. If you have similar issues and cisco products on your machine, try uninstalling.
Hope this helps!
I am using MOUNTAIN LION 10.8.4. - I use to be able to delete experired CERTIFICATES in the Keycahin. Now - I cannot! I do not know why - or where to find the delete feature for them. I thought it [a 'delete'] was in a right-click pop-up [mouse] menu - but that's not there now ... I searched everywhere [even via Google] - and found nothing obvious about: how to or where /deleting expired keychain certificates.
Message was edited by: michael deanfromswedesboro