Safari 26 on iPhone and iPad brings websites closer to apps by improving the...

https://bravo-wiki.win/index.php/Why_Do_Animated_Web_Games_Stutter_on_Some_Phones_but_Not_Others%3F

Safari 26 on iPhone and iPad brings websites closer to apps by improving the Home Screen experience. When you add a site to your Home Screen, it now opens using the new 'Open as Web App' mode