Friction is the ultimate mood killer. Today, we expect instant, personalized...

https://xeon-wiki.win/index.php/Designing_for_the_Multitasking_Mind:_The_Art_of_Mobile_UX

Friction is the ultimate mood killer. Today, we expect instant, personalized content that moves with us via cloud sync. If a screen takes too long to load or mobile payments feel clunky, we’re gone