DELL - XPS Killer Wifi

I was only getting 1.5mb transfer and 60mb web download

WARNING --  Changing the registry can break your machine if done wrong!!!  Do so at your own risk!

I had (sounds like) the same WiFi issues you are having.  I was able to "fix" it with a registry hack.  Go to this key Computer\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Power\PowerSettings\19cbb8fa-5279-450e-9fac-8a3d5fedd0c1 and create a value (if not there) Attributes with a DWORD value of 2.

Go a little further down, under the above key  to Computer\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Power\PowerSettings\19cbb8fa-5279-450e-9fac-8a3d5fedd0c1\12bbebe6-58d6-4636-95bb-3217ef867c1a\DefaultPowerSchemeValues\381b4222-f694-41f0-9685-ff5bb260df2e and add the same Attributes value here or set it to 2 if it's already there.  Under this key, change the DCSettingIndex to 0 (zero) to match the ACSettingIndex.

This makes the WiFi card use full power on battery under the Balanced Power Plan which is the default plan.

Also mentioned in my previous posts was to remove all the Killer software and use the Intel drivers instead.  The current version works fine.  Of course download the Intel drivers before removing the Killer stuff.     This did not fix the issue by itself but trust the Intel drivers more.