What's the biggest thing that's improved? We have 4x the pixels, so we spend 4x the rendering time to draw everything with 4x as many pixels, when it works, and complain when it doesn't.

Would have been easier to stick with the pixel density we had.

Oh, and we have to wait a frame to see everything because of compositing that I still don't quite understand what it's supposed to do? Something something backing store?