wet610n 2.4g 5g wireless speed 10baset ethernet

I purchased a WET610N with the hope that, as a dual band device, I could connect it to my 5G wireless network and get the same speeds I get for devices connected to the bridge with 10baseT. Thus far, it seems that's not the case. Both 2.4G and 5G wireless networks are sourced by a Comcast...