The CPU savings isn't from running a primitive shader (shaders are run on the GPU) it's from letting the GPU dispatch draw calls instead of the CPU having to dispatch them. (at least the patent in question is being interpreted to achieve)Thank you both. Though I fear the answers from sebbbi are a bit beyond my understanding. It feels just a touch out of reach for my knowledge.
Could have sworn I saw a graph of CPU usage that depicted an incredible percentage of usage that going to primitive shaders would eliminate or vastly reduce. Sadly I cannot find it. Probably wasn't correct anyway. Or I was just misunderstanding it.
high level summary
https://www.eteknix.com/executeindi...12-brings-improved-performance-low-cpu-usage/