Dell released an urgnet driver update for the n-6235. this fixed my problem.
I have new XPS laptop.  I have comcast internet.  my old inspiron laptop gets similar download and upload speeds (18 and 16). XPS laptop, which I received yesterday, gets download of 3 mbps and upload of 34.  I guess that means some program is transmitting.  no time to get malware yet.  how do i find out what microsoft, dell or whatever program is doing this?  I think the wireless adapter settings are ok.
comcast internet download speed much slower than upload