GUI session crashes on boot

I am trying to run Weston Wayland X server, in an attempt to get decent graphics performance.

This is about an NVIDIA Geforce GTX 1060 (driver from PPA https://launchpad.net/~graphics-drivers/+archive/ubuntu/ppa `nvidia-370` (370.28)) and a Phillips bdm4065uc.

Performance tests with 4k video are horrible in standard mir-xorg, lightdm/gdm, unity and gnome sessions.

But I noticed performance is excellent when running steamOS (debian 8.6 based), this one uses XWayland.
So I tried to get the same on Ubuntu but failed.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: gnome-session 3.18.1.2-1ubuntu1.16.04.2
ProcVersionSignature: Ubuntu 4.4.0-43.63-generic 4.4.21
Uname: Linux 4.4.0-43-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
Date: Tue Oct 18 10:24:44 2016
InstallationDate: Installed on 2016-10-17 (0 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
PackageArchitecture: all
SourcePackage: gnome-session
UpgradeStatus: No upgrade log present (probably fresh install)