URGENT: trouble with pyzor + spamassassin

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Dear All,

I have been running pyzor successfully for some time. Then recently
spamassassin has been causing horrible delays in mail delivery. After
viewing some debug output, it is apparent that there is a large delay
after the following:

Pyzor is available: /usr/bin/pyzor
entering helper-app run mode


Does anyone know how to correct this, or at least how to disable pyzor so
that spamassassin is not delaying mail horribly?

Thanks in advance.

-Ron