Compile and Tests, single-module project, 4 CPU laptop, as measured by GNU time. The value shown is the real (wall clock) time spend on the process, and the user-space CPU time (sum over all CPUs). The system-space CPU time was negligeable. The code was 16 submodules with 10 long running tests each. 16 submodules were chosen as a number sufficiently larger than the number of CPUs.