I have installed this build on my Lumia 1020, and so far its great. The battery consumption is much better. Also Windows Central app has no lag same is the case with some other apps which were lagging in 10536. So, Daniel was right problem was in the OS. Best of all is that I could now use Lumia Camera app even after updating from 8.1, so thats really great news for Lumia 1020 owners. So far my experience is very close to the one on 8.1.