CODEWITHSUNDEEP
iphoneobjective-c
The McG
The McG

Reputation: 175

iPhone app lag on startup before main

When I launch the app on my 3GS it sits on the Default.png for 4-5 seconds. I'm not sure what it is doing during this time. I placed NSLog timing statements at the top of main and didFinishLaunchingWithOptions. The NSLog statement from main does not print to the console until the moment that Default.png goes away, and the entire process from the top of main to the bottom of didFinishLaunchingWithOptions only takes 1 second.

So, what is my app doing before it starts main, and what can I do to speed that time up?

Upvotes: 1

Views: 280

Answers (3)

pohl
pohl

Reputation: 3175

Does your application do this even when there are no other programs resident in memory? The reason that I ask: since you have observed that the delay appears to happen prior to entering main(), then it is possible that iOS believes that more memory is needed in order to run your program. If there are other apps in the Suspended state, then iOS could be busy waking those apps up momentarily in order to invoke didReceiveMemoryWarning on their view controllers, and perhaps ultimately tell them to go away by calling their app delegate's applicationWillTerminate:. Perhaps this is what is taking time.

One easy test you could perform would be to completely reboot your phone and then launch your app a few times without running anything else first. After the first invokation of your app, I would expect it to start quickly (unless your app, itself, allocates a lot of memory!).

If you didn't want to reboot your phone, you could manually remove all of the apps from your multi-tasking switcher by closing each one by touching the red minus signs that you can bring up using touch-and-hold. Then run your app and see if you are still seeing the 4-to-5 second delay.

Upvotes: 0

Rob
Rob

Reputation: 7216

I suggest you look at your plist file and xib files (not 100% sure if root view gets loaded before or after main, but worth a shot). Also, how big is that png file? Try launching without it and see how long it takes.

Upvotes: 0

JustSid
JustSid

Reputation: 25318

Don't start from Xcode with a debugger, that takes a lot of time. You will see that your app starts much faster when you launch it via the icon on your homescreen.

Upvotes: 1

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