@Hornet Curly hair is a pain in the ass. So many layers of transparency that you get those blobs if not using enough trans bounces and if you do the render slows to a crawl. Even in your example here I can still see blobs in the hair. The trick I use is to use darker hair textures and strike a balance with the number of bounces.

W10, Ryzen 5 1600x, 16Gb,RTX2060Super+GTX980, PP11, 11.3.740