Modern shoppers have no patience for clunky checkouts or endless login loops....

https://wiki-velo.win/index.php/The_Psychology_of_Mobile_Impatience:_Why_Your_App_Performance_Matters_More_Than_You_Think

Modern shoppers have no patience for clunky checkouts or endless login loops. If your app buries the track order button or forces manual entry for every card, users will leave