First time post for a first time Mac owner. I've noticed a significant drop in wifi speed to the point where youtube is not smooth. Using MBPro 7,1 with xfinity blast. Down/Up speeds are 40/6Mbs on ethernet but 3/4Mbs on wifi. As far as I can recall, the only changes ive made are updates to Mac OS X10.6.8 (is this Snow Leopard?) and Parallels for running Windows. Please Help
Note, router is 2.4MHz not dual band, firmware updated/reset to 144 mbps a/b/g/n, channel changed from "auto" to "6" to diverge from neighboring channels, and ipad/iphone speedtest at 10Mbs/5Mbs, more than double MBpro.