Skip Montanaro <[EMAIL PROTECTED]> added the comment: Good question. I don't think it's MacOSX-specific. The original problem raised its ugly head on Solaris 10. I don't have quite as many versions of Python available there, but the relative performance is still bad, roughly 0.05 for os.popen and 0.82 for subprocess.Popen. Not as bad as on the Mac, but certainly not as good as what you saw.
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