[bug #44555] "make" fails to use parallelism

[Paul D. Smith]

Follow-up Comment #12, bug #44555 (project make):

Bisecting between 3.81 and current Git HEAD will not be very productive.  3.81
was released almost 10 years ago.  There have been many performance
regressions, and many performance improvements over that time.  It's likely
that some of the regressions are related to new features, and so it's not
possible to just remove those changes (I know, for example, that the new
feature allowing for pattern rules to match most specifically rather than
"first rule matches" added a lot of complexity and had some performance
impacts, especially if you have lots of pattern rules--I had an idea just the
other day that might simplify this but I'd need to play with it).

Rather than spend time bisecting it's much, much better to spend time looking
at the current behavior of Git HEAD with perf tools and discover what is slow
in your build environment.  Reports like that can, hopefully, be addressed.

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