TL;DR: Wrapping third-party include-heavy libraries in C++ modules improved clean-and-build time by about 40% for both my laptop and desktop. My desktop (which I haven't been able to use because of a leg injury), has like 20processor_threads each at 4.5GHz . Multiply that out, and you've got 90GHz-processor_threads . My laptop has 8processor_threads each at 2.0GHz for 16GHz-processor_threads . 90/16 is about 5.5 , and I certainly feel the difference on this laptop. I've been wanting to start using third-party c++ libraries as modules for a while now. There is a huge promise of build time speedup, but not all of the tools are in place for a library creator to provide their library as a module yet (via a package manager anyway). I learned recently that you can pretty concisely export included symbols from a module. For example: Here is my wrapper module for a popular command line parsing library: I was also recently forced to recognize just h...
