The phone has been pretty fluid and responsive for me, but I've noticed jankiness when using several apps. Here are two examples:
1. When swiping to the left from the home screen to access the Google feed
2. When swiping to the left from Instagram home screen to record a Story, and when swiping to the right from the same place to access Direct Messages
To those reading, please feel free to add to this thread if you experience similar issues when using the phone.