Here's an interesting article about the performance of software written in Swift: http://www.splasmata.com/?p=2798 I thought that the claims that it would run faster than C were dubious. I agree with some things the author says. The only way to write the code that handles an application's GUI is with OOP and Cocoa and it's fast enough, but for numeric calculations I use C. I don't even write these in Objective C because making the functions objects adds overhead, both in writing the code and performance. Also he does manual memory management and so do I. I find it as easy as doing it automatically with garbage collection. The code analyzer finds any potential problems so you should run it on a final version.