Virtualised viewports change the way that the output windows are created and can dramatically improve Hippotizer performance when using more than four viewports.
Normally, each viewport is created inside a discrete window which is placed on the output. This works well where there are four or less viewports. However, for more than four viewports it is more efficient to use one large window. Virtual viewports creates a single window around all the viewports and renders each viewport inside that window. There is no difference to the user; viewports are created and patched the same way in both modes.
It is usually best to disable render buffering when using virtualised viewports.
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