4.13 Released!

I really like the Shadow map caching feature, thanks guys! Well, i like entire update but this feature is really !

In the description of the Shadow map feature is stated that this works best with the scene that doesn’t move much. What happens if one light moves, or one actor?
Engine needs to create new cache of that one light (in case of light moving) and cache(s) for all the lights affecting one moving actor? Or this works entirely different?