On Lumia 950 .63 with newest firmware.
Everything seems stable and a little more responsive, but only in OS itself, not in Apps, etc. and Phone make less heat.
When multi-tasking, getting shutters, hangs, and so on, specially when browsing Internet, it is strange, you should not have any performance problems, when you have 3GB of RAM and Hexa-Core processor, have no issues with Lumia 830 on W10M , even 630 on WP8.1.
Battery, on stand-by is very good, but browsing Internet, no matter, Edge, UC Browser, Baconit, YouTube, it literally sucks battery in seconds. From 100% to 60% battery in only not even full 2 hours, with Battery Saving on and Brightness 25%. and nothing else in background.
Is it possible that installing firmware first, and only then updating from .11 to .36 and now to .63 could caused any problems?