You can find more detail on leveraging parallelized builds here: When should I check “Parallelize Build” for an Xcode scheme?īuild time summary enables reporting on the build times of each piece of the Xcode build. You can enable parallel builds by editing the Xcode Scheme and checking ‘Parallel Builds’ in the build action of the scheme. Gains will obviously depend on how your code is written, but it is worth testing since parallelized builds aren’t enabled by default. For projects with many smaller dependencies that can easily be run in parallel, this can offer significant time savings. Parallelized builds can reduce total Xcode build times by building components of the app that do not depend on each other at the same time. You can find configuration instructions here: Adjusting the Xcode iPhone simulator scale and size These configuration changes use less resources and help prevent tests from slowing down simulating pixels that no one will ever see. By using Physical Size or Pixel Accurate window sizes, you can reduce both the size of your tests and the time it takes for them to complete.
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The Apple iOS test simulator lets you test across different software and hardware combinations (but only from a Mac). Xcode New Build System for Speedy Swift Builds
You can find more details and instructions for enabling the New Build System here: Alternatively, the New Build System can be enabled via command line (details linked below). Be aware that while the New Build System is available in Xcode 9+, it must be enabled in Xcode under Project/Workplace Settings since “Standard Build” will be the default option.
Apple’s “New Build System” is written completely in Swift and was designed for overall performance and dependency management improvements. Keep in mind that you may need to experiment to determine if there are diminishing returns for parallelized builds with your code base, and then adjust the thread count accordingly. This takes advantage of some processors’ ability to multi-thread or simulate additional cores.
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However, you can dramatically reduce build times – in some instances by a full 30% - by increasing the thread count beyond the default. With reports that Xcode 11 builds are up to 50% slower, Xcode build speed has become an even hotter topic.īy default, Xcode typically uses the same number of threads as the number of cores in the machine’s CPU. In addition, this article references Xcode 9. UPDATE: This article has been expanded to add two factors to think about when speeding up VMs. However, there are several tweaks you can make to Xcode that can decrease the amount of time it takes for builds to complete without any extra work. As projects grow, build times can become problematic.
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