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if 20 processes of user.php is a problem on the server, then you can't have more then 20 people on your site. That should not be a problem. You could try setting the cookie session time to less time, but that will mean that if people are idle on your site for a while, they have to re-login. The server timeout problem is known before, but it can't be helped by the script. XOOPS is as light as it comes....
Herko