Messaging Lag
There’s major lag for iMessage and the message app when it’s first opened. This is inclusive and not limited to when the application is first opened via the app centre or Home Screen all the way to when you tap the notification from your Lock Screen or your banner.
This is unresolved and still persists. This is in the most updated version of the iOS and I’m currently using an iPhone 12 Pro.
iPhone 12 Pro, iOS 14