Caching issue in Portal

Hi,

I was having caching problem with the portal wherein if a user logs in without closing the browser, he will see the information of the user last logged in. In order to solve this problem, I made sure that the 'Allow client side caching' option in properties of iView is set to 'No'. This solved the problem, but since caching on the client side is disabled, we are having performance issues. Is there any way to prevent this caching problem and also make sure that the performance of the portal doesn't get affected.

Thanks,

Shiraz