I have a pretty new MacBook Pro (non-retina). All was working well, but after updating to 10.8.4, I seem to have a WiFI issue. All other devices in the house work fine with WiFi. When I can get Speedtest.net page to load, the results are good, about 30mbps down and 5mbps up and 11ms ping. However, webpages load ******, anytime I make a 2nd tab in safari, the new page is slow to load if it does at all. Some Messages accounts won't connect (gmail and AIM), other apps that require the Internet are just slow. Has anybody else experienced this and/or have a fix before I bother calling Apple and all that?