You're making a big assumption. Sure, some apps have handwritten assembly, but that's pretty rare these days. Apple's Accelerate framework (which has been aroun

You're making a big assumption. Sure, some apps have handwritten assembly, but that's pretty rare these days. Apple's Accelerate framework (which has been around since the PowerPC days) allows apps that need high performance in certain areas to do that without resorting to assembly: >This document describes the Accelerate Framework, which contains C APIs for vector and matrix math, digital signal processing, large number handling, and image processing. https://developer.apple.com/library/mac/documentation/Accelerate/Reference/AccelerateFWRef/_index.html https://developer.apple.com/library/mac/documentation/Accele...