I have set unix_group_enable: 0 and, for good measure, left
nsswitch.conf set to "group: files" instead of "group: files nis"
The difference in server performance is: total. I am seeing IMAP response time of 0.1 second instead of 10 seconds - I keep looking at the log to make sure that it's still running!
This is going to scroll off in a few hours, but you can see exactly where I turned off the groups and the response time line went from low to invisible
http://enki.gsd.harvard.edu/cgi-bin/larrd-grapher.cgi?host=hathor.gsd.harvard.edu&service=imap2&graph=hourlyhttp://enki.gsd.harvard.edu/cgi-bin/larrd-grapher.cgi?host=hathor.gsd.harvard.edu&service=imap2&graph=hourly
Thank you all again for your help! And I agree that this should come with some kind of warning label. Maybe put something in the default imapd.conf file along the lines of:
# group checking can cause performance problems; uncomment to disable if groups are not needed
# unix_group_enable:0
thanks Betsy
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