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As you know, the desktop can be a bit slower to move around than you're used to on your Pi. This is because all the processing is made by the the CPU...
The desktop system is not optimized to use the graphic core BCM2835 on the Raspberry Pi. The Raspberry Pi Foundation and a company called Collabora will remedy this.
If you've seen the video that heads this article, you will see the preview they are riding based on Wayland, a new system that will handle composition specifications coexisting with the X for a new generation that will build the full potential of graphics chips and not just the Raspi. We will look at other platforms and distributions (except in Ubuntu, who have decided to create their own solution).
Wayland core running on the video as we mentioned, but in parallel to OpenGL ES, so we can continue using both 3D renderings, freeing the ARM CPU to handle other tasks.
This will be implemented before the end of year, and we will be able to "play" with it in the next version of Raspbian before launch the final release.