Awesome

TilesheetStage3D

This is a class which extends openfl.display.Tilesheet and adds stage3D support to the drawTiles method, if available.

Ported to Haxe 3/OpenFL by AS3Boyan

Original repository: https://code.google.com/p/tilesheet-stage3d/

Currently it's not very fast at rendering lots of sprites, but at least, it's much better than default Flash fallback(In tilelayer). Also it has much lower CPU consumption.

How to use it

//Init Stage3D
#if flash11
    TilesheetStage3D.init(stage, 0, 5, init, Context3DRenderMode.AUTO);
#else
    init();
#end
	
function init(?result:String):Void
{
//init
addEventListener(Event.ENTER_FRAME, onEnterFrame);
}
	
//Add this before calling drawTiles to onEnterFrame handler
#if flash11
TilesheetStage3D.clearGraphic(graphics);
#end

You can use TilesheetStage3D under the terms of the MIT license.

OpenFL Stage3D drawTiles thread: http://www.openfl.org/developer/forums/general-discussion/stage3d-based-drawtiles-implementation-alpha/