The native camera app of iphone 7 is taking 5-20 seconds to launch.
To reproduce the issue:
1) Open the native camera app.
2) Close the native camera app by pressing a home button (important: do not delete the camera app from the recently used apps in multitasking).
3) Make 5 calls or more, each call 10 sec duration or longer. E.g. call your voicemail to simulate a day calls.
4) After making the calls, open the native camera app from the lockscreen.
More info: https://discussions.apple.com/thread/...