Windows is your foil. On the same hardware, Windows is 100x slower at forking an external process. When you are using a (POSIX) shell on Windows, don't cause

Windows is your foil. On the same hardware, Windows is 100x slower at forking an external process. When you are using a (POSIX) shell on Windows, don't cause a fork, especially in a loop. Do everything internally in a POSIX shell on Windows, unless an enormous time penalty is acceptable.