I installed cyanogenmod 14.1 on my oooold nexus 4 and it works surprisingly well. The launcher is smoother than android 5's was. Facebook is a bit more sluggish than I'm used to, but meh. Things are pretty smooth over all.
Now if you want to know why I even bothered... Well I spilled water ony one plus one again, and I'm letting it dry out before I try and use it again, but in addition to that, this nexus 4 has way better data speeds on wind than the one plus has. I may just stick with the nexus till I get a new phone. We'll see.
I'm lovin' the Nexus 6P and am on 7.1.1 as well. Telus is my provider though, so can't speak to Wind (now FreeMobile I think?).