Why is there so much more hair in render than viewport? Ok Ive checked relevant settings and made sure under "display" in my hair particle settings, it is 100%. I dont know why, in latest 2.8, there is so much more hair in render vs viewport - for example the hair looks normal in viewport, then in (cycles) render I get -



Here are other settings:



Is it to do with hair dynamics? even with that off, I still get this increase in hair.
Apart from the children display and render amount, there is another Amount option under the Viewport Display panel. You might have set it low. So at render time its rendering 100% of the hair particles.