Convenient, but "super fast"? And though it's a matter of opinion, I disagree. The GPU is easier for me to use for things like screen-space shading, alpha blen

Convenient, but "super fast"? And though it's a matter of opinion, I disagree. The GPU is easier for me to use for things like screen-space shading, alpha blending, sprite transformations and distortions, and it all performs much faster than the equivalent CPU render code.