Show specific portlets dynamically

I would like to implement a page what shows a specific portlet based on a variable. So dynamically should be determined what portlet should be shown on a page.
My intention is to create a proxy portlet what based on some logic calls the render method of some other (dynamically determined) portlet what hopefully displays the content of the specific portlet in the proxy-portlet frame. Is there anyone who has done this before or knows how to tackle this?
I am not familiar with the render engine and do not know how to call the right functions to show content of the portlet object.
The reason for doing this is to overcome a performance issue what occurs when you put a large number of portlets on a page and use security for showing only one of the portlets. It results in a lot of individual calls to the OID en chokes the system in our configuration.
Any help is appreciated.
Kind Regards, Dennis Deursen

Hi Patrick,
Thanks for your reply. The portlets we would like to dynamically determine and show are all page-portlets. This implies that we cannot use PL/SQL in these portlets. Maybe there is a way to use a PL/SQL portlet showing the content of a specific page, but I don't know how. Maybe that is something I can investigate. You solution is quite straightforward but sadly only applies to PL/SQL portlets.
Another way to solve our problem is to use a PL-SQL portlet what defines an i-frame what shows the content a the page and let PL/SQL define dynamically what page to show in the i-frame. The drawback here is that you get nested pages when the page as shown in the i-frame has links. I am trying to add the tag <base target="_top"> to the header of the pages to show in the i-frame but i can't find a way how to change / add html code the the <header>-part of the pages...
(nice puzzle). Anyhow, there must be a way to solve this on way or the other.
Dennis Deursen

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