[Zope] Speeding up Zope by disabling logging of hits

I'm using zope behind a front-end server and don't require any logging of hits. Is there a way to disable Zserver hit logging to increase speed and decrease disk utilisation? (I suppose I can send output to /dev/null, but that doesn't stop the logging code from being executed, and I would also lose error logging.) Even better would be the ability to disable logging based on IP address of the requester. Thanks. David Trudgett