As the maintainer of SCons I can assure you that we are aware of SCons's performance issue. The page in question is actually quite old at this point. Since th

As the maintainer of SCons I can assure you that we are aware of SCons's performance issue. The page in question is actually quite old at this point. Since the content was written Ninja, Cmake, Bazel, and other build systems have launched and become mature. We are slowly working through the easiest of the list of known performance issues. In addition MongoDB has contributed their Ninja file output logic. We expect to integrate that in the next major release. Projects like MongoDB, Godot, VMware, PlatformIO, and many others use SCons. One of it's strengths is the ability to correctly build complex builds. Please engage with the community our users mailing list, IRC Channel, or discord server if you're a user. One frustration for the project is that users run into issues using SCons and never reach out and ask for help. Many times a small change in usage will resolve whatever has a user stuck.