iOS 14 was buttery smooth even on beta. Things have improved 1.5x now on GM. Brilliant optimization. Users are in for a great experience on this iOS release!!
One of the new features in iOS 14 is the ability to change the default email or browser app to a third-party alternative such as Chrome, Edge, or Outlook. A bug in the first public release of iOS 14, however, causes your default browser or mail app setting to reset to Mail or Safari when your iPhone or iPad reboots.