Delay in presenting a modal view controller

Question

I have a tab bar based app. There are navigation controllers in all 5 tabs with instances of custom view controller setup properly as root view controllers. This loads just

Answer 1

I have also had this strange delay when presenting from tableView:didSelectRowAtIndexPath: looks like an Apple bug.

This solution seems to work well though.

CFRunLoopWakeUp(CFRunLoopGetCurrent()); // Fixes a bug where the main thread may be asleep, especially when using UITableViewCellSelectionStyleNone