This bug exists since iOS 7.1 update and it was not fixed yet. I have described the problem in the thread below. http://forums.macrumors.com/showthread.php?t=1727969 Just to summarise if your carrier name is too long and does not fit on the status bar, it creates a delay in opening apps. I have observed that the problem still exists in iOS 8 beta 3. I have reported the problem in apple like 4-5 times. As i am not developer, can any developer here open a thread in apple to report this problem? It makes my iPhone 5s slower than 4s.