title: PlayN WebGL perfomance for canvas
body: <p>WebGL is really slow.</p>
  
  <p>100 sprites per frame - ok,</p>
  
  <p>1000 sprites per frame - need optimization,</p>
  
  <p>10000 sprites, fps drop down from 40 to 20fps.</p>
  
  <p>I do not need 3D at all. I do not need filters, shaders, lights and other 3D stuff. I need just fast 2d canvas (without pixel smoothing) with ability to render png's and render shapes for debug (lines, bars, circles).  Is there any possibility to exclude WebGL from PlayN engine and switch to HTML5 Canvas? (I suppose it will be much more faster than WebGL.)</p>