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Animated HDRI backdrops

Trying to create a realistic landscape with moving clouds. I was wondering if

  1. Is there a good 3rd party asset for playing animated HDRIs?

  2. Is there a good resource online for animated HDRI (equirectangular of cube box format) movies? and most importantly

  3. How resource intensive is it to do something like this? I of course would not be using this for real time GI, just for a realistic moving cloudscape.