I have a 50 Mbps connection through Comcast. When connected to my router via ethernet cable, every speed test that I perform consistently reports a 50-55 Mbps download speed. However, when I connect to my router via wireless N the same speed tests report download speeds in the range of 20 Mbps.
What's even stranger is that when connected wirelessly I can download files from other PCs on my network at speeds of 40-50 Mbps.
So in summary, wired I can download data from both within and outside of my network at speeds of 40-50 Mbps, but when connected via wireless N I can download data within my network at 40-50 Mbps but only at 20 Mbps from sources outside of my network.
Does anyone know why this issue occurs and how I might correct it?