protip: a lot of paid assets use insanely high resolution bitmaps on things like hair, and while it's not super obvious, a lot of overhead is spent loading and shifting around texture memory that you may not (will not) ever benefit from or perceive. some of the hairs out there use 4k maps for insane things like normal map or flood fill blend layers. whether or not you are rendering an extreme closeup of a patch of hair the size of a postage stamp at movie screen size, your graphics card has to load all of those referenced maps and hold them in memory just while moving around the scene in preview - some hairs use 10+ 4k maps - literally ten maps or more, 4k resolution, this is an enormous amount of texture memory - and this is essentially impossible for a normal person graphics card to do without a lot of texture swapping overhead.

SOLUTION: identify these and reduce texture sizes, just scale them down to 1K or 512x512. Back up the originals and load these bitmaps into an image editor and just resize them, it's easier than you might think. Whenever you are downloading something like a hair model and it's more than 10mb or so, that is a red flag.

My Freebies