Apple has been offering the final version of iOS 15.4 for a few days and some users are complaining about the autonomy of the iPhone. They believe that the situation was much better with previous versions.
Autonomy issues with iOS 15.4 for some users
Recently, Apple responded to worried customers to reassure them. On Twitter, customer service ensures that the behavior observed is normal immediately after installation. “Thank you for contacting us! We will be happy to help you. It is normal for your apps and features to need adjusting up to 48 hours after an update”can we read in.
Thanks for reaching out! We’ll be happy to help. It’s normal for your apps and features to need to adjust up to 48 hours after an update.
Let’s have you reach out to us in a DM if this is still an issue after that time so we can help you look into this further.
—Apple Support (@AppleSupport)
You have therefore understood it, it is best to wait at least two days after installing an iOS update in order to really see if the autonomy problems persist. Why this delay? Because iPhone indexes some files again and it uses resources. And the more files there are, the longer the scan takes.