Hey thanks for the reply! Sorry I should have mentioned Im on 4.27 so dont have alot of those options 
Thanks for the doc, the ue4 version of that is pretty bare… is it just too old?
would anyone know of any other documentiation for this version, esp on cvars like “r.VT.PoolSizeScale.Group0” … I havent played much with these settings yet… so far Im finding a engine restart is a short term fix but I still end up with these problems when trying to render high res in movie render.
Thanks!