BTW, X11 with DRI3 has the same performance as Wayland.
Next, there are a bunch of reasons why Linux distros run games slower than Windows. Most games are made for Windows in mind in the first place, so unless someone does a whole conversion of the graphics code base to optimize it for OpenGL, DirectX ends up wrapped or translated with loss of performance. This has nothing to do with how much the desktop feels "responsive", and it completely off topic here.
Wayland is not the Messiah and is not going to provide massive performance improvement. Already confirmed with the alpha/beta out. And it brings a ton of problems too since each application cannot access information from other applications (screensavers, screen capture programs would not work in Wayland). That's why they have the XWayland project.
And X11 is not a dog. That's a lot of history in it, nad it may be bloated, but it can still perform very well - there are a few games ported from Windows that run faster on Linux (Dirt Showdown is one).