Logging in Calendar Server sometimes takes forever

Test setup :
- On Windows NT Server 4.0 SP6a
- Sun ONE Calendar Server (5.1.1),
- Local user prefs LDAP database : IPlanet Directory Server
- Distant auth LDAP database : OpenLDAP
Just after restarting the services, login procedure works OK and fast. After a few hours of use, login procedure takes about 2 minutes and 40 seconds (but finally works).
Other factors :
- If the login credentials are cached, everything works OK and fast. If and only if the credentials are not cached and the server has been used for some time, then the login takes forever.
- Network sniffing reveals that CS does two LDAP queries : one to get the DNs related to the login, one to check the credentials using a BIND operation. When everything works, the two requests are done quickly in succession. When it doesn't work, the first request is done (answer comes immediately) then CS delays for about 2 minutes 40 seconds before doing the second request.
- I've played with several ics.conf parameters (LDAP cache, session duration, HTTP timeout...) without much success.
Any ideas ?

It's possible that you are having a problem with some Firefox add-on that is hindering your Firefox's normal behavior. Have you tried disabling all add-ons (just to check), to see if Firefox goes back to normal?
Whenever you have a problem with Firefox, whatever it is, you should make sure it's not caused by one (or more than one) of your installed add-ons, be it an extension, a theme or a plugin. To do that easily and cleanly, run Firefox in [http://support.mozilla.com/en-US/kb/Safe+Mode safe mode] (don't forget to select ''Disable all add-ons'' when you start safe mode). If the problem disappears, you know it's from an add-on. Disable them all in normal mode, and enable them one at a time until you find the source of the problem. See [http://support.mozilla.com/en-US/kb/Troubleshooting+extensions+and+themes this article] for information about troubleshooting extensions and themes and [https://support.mozilla.com/en-US/kb/Troubleshooting+plugins this one] for plugins.
If you need support for one of your add-ons, you'll have to contact its author.
If the problem does not disappear when all add-ons are disabled, please tell me, so we can work from there. Please have no fear of following my instructions to the line, as all can be easily undone.

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r b w swpd free buff cache si so bi bo in cs us sy id
1 2 0 116104 6796 18120 489684 0 0 3 0 3 7 4 7 2
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1 1 0 116104 7084 18216 489728 0 0 37 1578 673 333 44 3 53
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2 0 0 116104 6776 18432 489324 0 0 34 1524 664 313 48 3 49
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2 0 0 116104 6776 18500 488424 0 0 32 1484 667 316 45 3 52
1 1 0 116104 6776 18516 487488 0 0 11 1301 650 287 28 3 69
0 1 0 116104 6776 18560 488316 0 0 35 1183 637 264 30 2 68
0 1 0 116104 6776 18584 487344 0 0 34 1363 645 276 47 3 50
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