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At the moment parenting a mask or its vertices to another object like a null is not possible by default. Although it is one of the most wanted features, probably there is no official solution for this. But in the same link you can find a link to a forum post where scripting master Dan Ebberts offers a solution. This solution has some limitations though, yet ...

Make sure that resolutions match. Look at the properties of the source clip, make sure that all of the main parameters (height, width, pixel ratio, frame rate) match for your composition and your export. If it is having to interpolate pixels (as a result of non-divisible height or width or a difference in pixel aspect ratio) or interpolate frames (as a ...

It sounds like you've switched over to Active Camera in your Composition window. You may need to switch the Composition viewport window to the camera you wish to use. Do this by selecting the camera in the dropdown menu at the bottom of the Composition window. Hope this helps!

Some novel ideas physical: better CPUs, more RAM crowdsourcing: render farms & distributed rendering like here knowledge & experience: elegant simple shortcuts -- keep things simple: no smoke or fluid etc CPU-expensive stuff Perhaps Related, found after some googling but not sure ...

You could try: Turning off ray tracing Lowering the resolution Turning off soft shadows unless needed In Blender, use the Simplify option These and others are covered in this blenderguru article