This is a standard part of the portlet lifecycle (portlet 2-phase, action/render
lifecycle).
Off the cuff, I can think of a few ways to help with your scenario:
don't load data from the database in your render (doView) calls
check out the out of the box ajax/partial-refresh features to see if they can work in your
scenario:
http://docs.jboss.org/jbportal/v2.7.0/referenceGuide/html_single/#d0e13283
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