I just noticed that when I try to get on the internet with my MB PRO, I will go from blazing fast speeds (DOCIS 3) to no internet connection. The weird thing is that it just seems to be from programs that access the internet. I can log onto the wireless with my old MB or my iPad and have normal internet function. Also I have a MacPro that is connected via Ethernet and that runs fast and normal. Also, on the MBPRO, I can run screen sharing at full resolution while the slowdown/no access is happening with my internet browsers and it works fine. It just seems to be programs that are accessing the internet. I also get this problem regardless of what browser I use. That is, if I get a slow down on Safari, I can immediately open Chrome and there is a similar lack of activity. I also have the same extensions loaded on my MacPro and MB Pro....so not sure if that is what is causing the problem. Anyone with any ideas?