Xcode 10 includes everything you need to create amazing apps for all Apple platforms. Now Xcode and Instruments look great in the new Dark Mode on macOS Mojave. The source code editor lets you transform or refactor code more easily, see source control changes alongside the related line, and quickly get details on upstream code differences. You can build your own instrument with custom visualization and data analysis. Swift compiles software more quickly, helps you deliver faster apps, and generates even smaller binaries. Test suites complete many times faster, working with a team is simpler and more secure, and much more.. * Testing conducted by Apple in May 2018 using production 2.9GHz 4-core Intel Core i7-based 15-inch MacBook Pro systems with 16GB of RAM, running prerelease macOS 10.13.5, Xcode 9.0, and prerelease Xcode 10.0. Apple tested using debug mode and made minor adjustments to the Kickstarter, Firefox, and Wikipedia open source projects so that they would compile with these Xcode versions. Performance . Xcode 9 Beta 2 | Mac OS X | 4.6 GB . With everything you need to create amazing apps for Apple platforms, Xcode 9 is unbelievably quick and consistently smooth while editing even the largest files..