When rendering animations, you can save the UHD Cache and reload it to save recalculating it for each frame (so long as lights and objects are not moving). This QuickTip takes a basic, introductory look at you how you can set that up to save render time for creating animations - sometimes other computation methods are required, and you can read more on that here: https://coronarenderer.freshdesk.com/support/solutions/articles/5000515648