Caching authentication requests?

I want to use something like auth PAM but this seems to cause a PAM
conversation for every request and that is slower. Is there a way to
cache
a successful authentication so that an authentication happens only once
or
every so many seconds?

I asked this question awhile ago but got no responses. I guess that
means
its either majorly stupid or completely obvious. I’m running on a
beaglebone and when I enable something like auth_pam the number of
requests
I can handle drops from about 500 per second to about 30 which isn’t
suitable. Any kind of point would be help.

Posted at Nginx Forum:
http://forum.nginx.org/read.php?2,233054,233534#msg-233534

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