I found it runs better on newer devices (since It was probably tailored to the newer chips) and I would call its performance on the 920/820 to be between tossing it back in the oven or half baked.
Good point Xandros9, probably focusing on the newer tech to get the 950s out the door. If I remember correctly, they did that with 8, got it running on the newer phones, then got it on the older ones.
Im running the Micorosoft Lumia 735 and I say almost there. A few minor problems but This build is much better than last and Battery performance for my phone is just as good as 8.1 if not better
It's still a little slow / laggy on my 822. It is much improved over previous builds though. I will probably wait until its released before I install it on my 735.