Will iOS 27 Slow Down Your Older iPhone? Apple Tested Its Speed Claim on an iPhone 11 Pro Max

Apple has published nothing that says an iPhone runs slower after a major update, and there is no iOS 27 known-issues document to check against. The one published measurement that speaks directly to older hardware was taken on an iPhone 11 Pro Max, the oldest generation iOS 27 supports, and it points the other way: app launches up to 30 percent...