I believe that the most HW optimizations are made in MacOS on DWM level - window composition and animation. Window surface is just a bitmap in RAM that needs to be populated by CoreGraphics/CPU.

In any case Acrylic/Vibrancy effects or "blur-behind background" (like on screenshots here: https://sciter.com/sciter-4-2-support-of-acrylic-theming/) are achievable only on GPU and on DWM level.