Xcode 6.1.1 Run on device slow "Copying Swift standard libraries"
Swift is a new language with a new compiler that has yet to optimized to the amount that Objective-C has since Objective-C has been around for many years.
Swift's compiler is also doing a lot more than Objective-C's compiler considering Swift is more strongly typed and does not required specifying imports (among other things).
Still, 76 seconds is a long time so either your computer is underpowered or you are low on resources for some reason.