I don't know if you missed it...but that is the focus of iOS 12. Performance is improved even on older devices and all devices that can install iOS 11 can insta

I don't know if you missed it...but that is the focus of iOS 12. Performance is improved even on older devices and all devices that can install iOS 11 can install 12. There are barely any new features other than some small quality of life improvements, like these changes to notifications.