I have the same thing happening. Even making a material with a single constant plugged into the Diffuse will require around 100 shaders to compile. And any small change to anything within the material, even changing the constant from 1 to 2 will require 100 shaders to compile. Eventually all the small changes you do will add up and start going to the 400’s and 800’s if you’re making a lot of small changes in a rapid succession. This didn’t happen in the previous version and I hope there’s a fix soon!