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 Use parallelized builds: 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. The Apple iOS test simulator lets you test across different software and hardware combinations (but only from a Mac). 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. However, you can dramatically reduce build times – in some instances by a full 30% - by increasing the thread count beyond the default.
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