Slow Wifi on iPhone/iPad - Fast on iMac

[photogpab]

When I run speed tests on my iMac I average 80+mbps download/upload. When I run speed tests on my iPhone or iPad I get blazing fast UPLOAD speeds (sometimes over 70 mbps) but my download speeds hover between 2 to 3 mbps.

I don't get what's going on with my download speeds on my iPad and iPhone. iOS 8 bug?

 

[frankdovdp]

Same here. 4S with iOS 8 and MBP. Connection goes pretty well on my notebook, but it lags on my 4S, even for browsing.