Why does bzr not use Psyco? On a 2GB repository, using psyco.background() reduced the "bzr st" operation from 5 seconds to 4 seconds, an appreciated speedup. Below is the quick patch I made; if psyco is installed, it'll use it in the unobtrusive background profiling mode. If it's not installed, the ImportError is caught and we move on. The break-even point is the time it takes to perform the import of psyco (not any longer than importing a plugin). === modified file 'a/bzr' --- a/bzr +++ b/bzr @@ -17,6 +17,11 @@  # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA  """Bazaar-NG -- a free distributed version-control tool"""  import os, sys +try: +    import psyco +    psyco.background() +except ImportError: pass +  if __doc__ is None:      print "bzr does not support python -OO."      sys.exit(2)