> Unlikely. Frosted glass blur was introduced almost twelve years ago in iOS 7, and was supported all the way down to the iPhone 4. Many apps like control center have used a full screen blur without any performance issues for a long time.
"Without any performance issues"? Entirely false - reviews at the time noted iOS 7 dramatically reduced battery life - all across the board for Apple devices, even for the then latest iPhone 5S and 5c (https://arstechnica.com/gadgets/2013/09/ios-7-thoroughly-rev...).
The abuse of transparency/translucency in the UI was the primary reason - you could go to Accessibility settings and disable animations + transparency/translucency and get notable increases in both runtime speed of the OS UI and battery life.
"Without any performance issues"? Entirely false - reviews at the time noted iOS 7 dramatically reduced battery life - all across the board for Apple devices, even for the then latest iPhone 5S and 5c (https://arstechnica.com/gadgets/2013/09/ios-7-thoroughly-rev...).
The abuse of transparency/translucency in the UI was the primary reason - you could go to Accessibility settings and disable animations + transparency/translucency and get notable increases in both runtime speed of the OS UI and battery life.