See launchpad https://bugs.launchpad.net/zope-pas/+bug/273680 I've put the patch on a branch at svn://svn.zope.org/repos/main/Products.PluggableAuthService/branches/ slinkp-fix-anonymous-performance-branch ANy objections? If not, I'll merge it to the trunk and the 1.5 branch. (There does not seem to be a 1.6 branch.) - PW