We at BlueDynamics Alliance are at the moment refactoring pas.plugins.ldap and much more node.ext.ldap. Latter works now in a Pyramid project with 68000 users (w/o caching). Some optimizations are left (i did not check user-listings and I think we need to work on that). But overall most of the work is done.
For the curious: both packages are having a performance branch. Overall it works, but expect bugs, we're havent finished yet.
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