Inconsistent performance over wifi I noticed this with my Nexus 5, and was surprised to see it continue with my new Nexus 6P:

I have a 5th generation Apple Airport Extreme. When I am using my Android phone on wifi, images load really slowly or not at all on apps like Facebook and the Google Play store. When I switch to LTE, they load right away. This is weird, because my speed tests indicate 100mpbs performance over wifi, and most other apps don't have any issue.
It turns out turning off IPv6 support in the Airport config fixed the problem.