Xcode 6.3 storyboard compiles very slowly

Question

Well, for a long time I came across this problem, the storyboard is specially for the iPad , it compiles very slowly .

NOTE. - The project has no problems with auto-layout, and the project contains two storyboards for the iPhone and another for the iPad. iPhone storyboards compiles very quickly. I think there are several scenes or view controllers, but the iPad storyboard contains 40 scenes or view controllers and more than 30 segments connected to each other.

Here is a screenshot :

Here is my mac-mini specification : -

, . , - , ?

, iPhone .

PS , Super User, . - , , , .