I have an app with a button.
I start the app, then put the iPhone to sleep.
I wake the phone up and press the button repeatedly, until something happens.

There is an NSLog() in applicationWillEnterForeground: and in the action method 
of the button.
The time difference between these two is 1.1 ... 1.4 seconds.

Did the same with Time Profiler in Instruments: 1.357 seconds elapsed time, 
Running Time 0.044 sec.
That is: my app was doing nothing for about 1.3 seconds.

This is really annoying: one wakes up the phone, the app looks responsive, so 
one taps the button - and nothing happens.
One has to wait a second, tap the button again - and then it works.

How can I find out what is going on?
How to avoid this?

Gerriet.

iOS 7.0.4

P.S. Made a new Single View Application (which has nothing except a Done button 
in a Toolbar at the bottom) and did run it on iPhone 4s:

2014-01-29 21:52:55.540 TestRestart[624:60b] -[T1RAppDelegate 
applicationWillEnterForeground:]
2014-01-29 21:52:55.552 TestRestart[624:60b] -[T1RAppDelegate 
applicationDidBecomeActive:]
2014-01-29 21:52:56.949 TestRestart[624:60b] -[T1RViewController donePressed:]
2014-01-29 21:52:57.157 TestRestart[624:60b] -[T1RViewController donePressed:]
2014-01-29 21:52:57.365 TestRestart[624:60b] -[T1RViewController donePressed:]
2014-01-29 21:52:57.557 TestRestart[624:60b] -[T1RViewController donePressed:]

Again a delay of 1.397 beween applicationDidBecomeActive and the first reaction 
to my button.




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