iPhone SE (2nd gen) got slower after iOS 15 update
My iPhone SE 2nd generation has gotten slow after I updated it to iOS 15. What can I do to restore its original speed?
iPhone SE, iOS 15
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There may be apps that are inherently incompatible with the new iOS
Start by removing any VPN or security apps. Apart from being totally unnecessary they are also a strong contender.
Many mainstream apps need an urgent update, so go to App Store and scan through your apps for those that need updating.
While there, uninstall any apps you haven't used for some time. They are unnecessary update burden.
Check the battery usage chart in battery settings for any obvious bad apps but not every background process is shown.
Any streaming apps or apps that can run with phone closed, or Clocks that hold the phone unlocked, always force close them afterwards, despite the accepted wisdom not to.
In extreme cases you can backup and restore to factory.