I think it's a bug on iOS15+ system when I disctribute app select enterprise (Disctribute to my organization). In this way launch up App will take more than 10s on iOS15+ system,but it launch up normally on system before iOS15. I make a lot test,There a few conclusions: Use the individual membership disctribute APP ,the APP launch up normally on any iOS systems devices; Use the organization membership disctribute APP, It need more than 10 seconds to launch up APP on some iOS15+ devices，but it launch up normally on the devices which system below iOS15. If disctribute the APP by APP Store,the APP aunch up normally on any iOS systems devices; It seems that there is a bug on iOS15+ when launch up the APP which disctribute by using organization membership. I know APPLE change the code signature on iOS15+, see:https://developer.apple.com/documentation/xcode/using-the-latest-code-signature-format#Overview Is there anybody knows why It takes more than 10s to launch up APP on iOS15+ system which disctributed by using organization membership or how to fix it.