While testing out the near-final GNOME 3.26 this weekend I also ran some benchmarks of it comparing the boot time, memory use, power consumption, and gaming performance when comparing GNOME Shell / Mutter running on Wayland and then an X.Org session.

Source: Phoronix – GNOME 3.26: Wayland vs. X.Org Performance – Boot Times, Power Use, Memory Use & Gaming