Portlet Packaging
By default, portlets do not share the Portlet Session object. So, if a page has 4-5 portlets, each portlet will have its own portlet session object. This can lead to a lot of overhead when rendering the page. To avoid this problem, portlets with common functionality should be packaged in one WAR file. Further the portlets packaged in the same WAR, share the same Portlet Session object, hence saving on the memory requirements, all leading to faster rendering of the page.
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