It appears that the N5 doesn't work well on the 5 GHz band: the speed can fluctuate between 57 to 0.2 Mbps, several times, within a period of a couple of minutes. Sometimes, it even drops the connection. On 2.4, on the other hand, it's smooth sailing at consistent speeds of around 40 Mps.

EDIT: Even faster now.


Sent from my Nexus 5


NEXUS 5 D820 STOCK KK442 FK46 DALVIK XPOSED TWRP2734