Why is my iPhone 7 Plus running slow?
The iPhone I have is going slow
[Re-Titled by Moderator]
iPhone 7 Plus, iOS 15
The iPhone I have is going slow
[Re-Titled by Moderator]
iPhone 7 Plus, iOS 15
It might be caused by your battery health. iPhones will throttle if the battery is below a certain percentage of overall health (not charge).
Try this:
Why is my iPhone 7 Plus running slow?