Hi Omar @dostovel,
I totally agree with you. In animation, the render time will be more critical. That is why I am eager to learn to what extend those portals affect the render performance. As of this scene the speed up percentage is 4sec/290sec = 1.38%
PS: To my surprise, without the Volumemetric Cube included the scene actually rendered slower with the portal! The image is better in quality with portal though.
