Can speed of Wayland overtake the toll of emulating X?

[R .]

So I've been test driving Wayland and it has more lag than LXDE (understandably), and, of course, will get better... But, I'm more concerned with backwards compatibility (and speed) with old X clients (until, of course they eventually, port to Wayland). Since XWayland is another layer, so will inherently will add toll, but can that be completely overtaken by the lightness and speed of Wayland? I really need a minimalistic and fast desktop environment, you see...

 		 	   		  
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