I did do the DP upgrade when it was first available, eventually I reset my phone (I had random heating / battery drain) without a recovery from a backup, reinstalled all apps. (note in the original update and reset I never used Cortana or battery saver because of drain and heating issues). After the reset I had many lockups and heating battery drain when unlocking the phone much worse than with just the DP upgrade probably because Cortana was pinned at this time.
When the latest OS update came I ran that.
Now my phone never hangs anymore on unlocking and doesn't overheat with rapid battery drain and I have these settings / changes:
- I don't have Cortana pinned now.
- She is activated and is also allowed to run in background
- Obviously location is turned on for Cortana use.
- Removed all battery saver apps (battery performance) and am just using the built in Battery Saver which is set to run in background as well.