I wonder if it's something with the Pro or Pro Max? My wife as the standard iPhone 14 and it doesn't do this. I've played around for hours on it trying to make it happen. When this happened back on iOS 13 some people swore they didn't see it either. Apple support was convinced it was an issue with specific accounts. If I was able to get a spare iPhone 14, I'd activate it with my account and see if it happens with my account on that device because my wife's definitely does not have it.
My iPhone 13PM was logged into my account and it didn’t have this issue. I’ve never experienced this issue on iPhone X, XS Max, 11PM, 12PM and 13PM, the latter with iOS16. This issue only happened to me with 14PM. I think it has to do with 14PM and iOS 16. If I had a spare one I would perform a clean install. In my second and third trial, in the three different iPhones, everything began during backup from iCloud, especifically with meta WhatsApp. The app installation got stuck at some point, after download, and then I deleted the app and downloaded it again but from App Store. Then the first lag, the double stutter effect, appeared.
I’ve already experienced many bugs due to backup from iCloud, but they were related to apps functioning and not the iOS itself. It probably has something to do with always on display and dynamic island software changes. Clearly a RAM issue. Maybe a backup from an iPhone without this technology (13 PM and below) could trigger an abnormal response. I’d prefer to download all my 300 apps every other day TGO than experiencing this issue.
I swear to you that my 13PM was perfect, with no lags and iOS 16.02 installed. It’s not only a iOS 16 thing. But some people do report the stuttering after updating to iOS 16 in older iPhones. Some say they’ve done a clean install and even tough had the issue on the 14PM. There isn’t a clear and unique pattern. All we can say is that it’s an iPhone 14 Pro and iOS 16 tendencious issue, maybe aggravated by backup from iCloud using an older iPhone. I really hope it’s not related to some Apple accounts. It wouldn’t make sense unless for the backup.