About a week ago I started having unbearably slow internet on a Mid 2009 MacBook Pro. The problem occurs on both wired and wireless connections. The problem occurs in Safari, FireFox, and Chrome. The browser stalls at the "connecting" phase of web page loading. Speed tests are not impacted. Sometimes it appears to load pages in "bursts". I have tried 3 changing the DNS and still have the problem. I have tried reinstalling OS X and still have the problem. The problem does not occur on my desktop PC with a wired connection. Any suggestions?