Just want to chime in on Dekesask's comment - I also had almost no lag when I first turned this phone on with 5.1.1. Even after installing all of my apps and whatnot, there was almost zero lag (except when 45 apps were installing and I was multitasking...even then, hardly noticeable). Keep in mind, I'm coming from an iPhone 5S which is still relatively smooth. Comparatively, I'm finding my X Play to run MUCH better than the iPhone has been in the last few months.
Yesterday I updated to Marshmallow and I can absolutely say without a doubt that this thing flies on 6.0. Even with the GNL. On top of that, I'm running Nova Launcher Prime and it is buttery smooth. In case anyone is worried about this phone being bogged down, I'd say that Moto probably focused on optimizing 6.0 software instead of 5.1.1. Hopefully others have found similar results!
All in all, I'm in absolute love with this phone. Finally found the one that will make me kick my iOS addiction for good
EDIT: I should specify, it's important to do a factory reset after doing an OTA Marshmallow update. My experiences are based on that, so YMMV.