I am still upset at how horrible Cortana is hands-free in a car compared to what it was in 8.1. Seriously massive regress, sending and replying to a text is just ******* even worth the effort anymore.
The need for a PIN code for her to finish the transaction is the biggest issue, the lagginess of her actions is bareable for the most part, but the PIN code thing breaks the whole damn thing if you don't enter it.
I think I isolated the issue with her speech recognition to the Nokia Qi Car Dock I have, when its in the cradle its like she becomes dumber than a sack of bricks, take her out of it and place it in the cup holder next to me and she will be pretty damn good at recognizing my voice, it could also be that the phone is close to the head unit and there is signal interference but either way, I never experienced this **** poor experience or performance in 8.1. Its my only peeve right now, I don't care about an app crashing at this point I just want the Hands-Free to be actually HANDS FREE.
THIS HAS BEEN THIS WAY SINCE THE VERY FIRST W10M BUILD
BACK ON TOPIC: Yes my ICON and 735 both run smoother, cooler and retain proper battery and I can leave cellular data on now