@tomzorz OK so the closest to what I'm looking for is this, where the author dumps buttloads of data to the screen to measure speed - something I've been told as a reason for acceleration before:
https://www.youtube.com/watch?v=nK8kgOplAKQ (I tried to ignore the discussion...)
IMO dumping this amount of data to your terminal is usually the result of a mistake because you just can't read through the data anyway. This suggests GPU acceleration is a micro-optimization.