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It appears that the set-port-size action is related to setting/adjusting the dashboard sizes. We traced the instance to the following scenario:
-A dashboard was embedded in a .net web frame.
-IE8 on Windows 7 was used to access the page
-When the user docked the screen to one side of the screen, Tableau got stuck in a continuous re-sizing loop that consumed resources. This was exacerbated when multiple users performed the same task.
-Maximizing the window resulting in the process to cease.
Our solution was to resize the frame window, removing its scroll bar. This allowed the window to resize without sending the server into a tailspin.