How to decrease the time to go main controller after application is launched in iPhone

My application has Splash Screen in which the image taken is Default.png. Splash screen has delay of 4 sec.The time taken to start the main Controller after launching the application is 10开发者_如何学C sec in my Device. How can I reduce the time to come to mainScreen after the application launch.

Can Anyone please suggest the solution for this.

Thanks in Advance.

Profile using Instruments so that you understand why your app is taking so long to start. Try to avoid doing anything that's not absolutely necessary at launch, particularly those tasks that take the longest. Defer those tasks until they're actually needed, or move them to a background thread, or both. Jobs like downloading data can usually be done quite effectively in the background.