[bleep42]

I was mearly pointing out, to those concerned, that there had been an apparent retrograde step, as far as HEVC decoding was concerned, I note that there have been a couple of further ff-mpeg updates recently, these have made a very small improvement in CPU usage, but nothing like it was before.

Our HEVC guy has reproduced the issue. He can see it when rebasing to ffmpeg 4 without any change in the Pi specific code.
Very high bitrate files have ~10% performance hit. We'll try to identify what has caused the issue. 

Thanks Popcornmix,
To reiterate, I am quite frankly stunned at how well HEVC plays on a Pi3, even a Pi2, when I think of how it was a year or so ago, and how everyone said it would never work without pure hardware decoding, all due to your and your teams fantastic work. Thank you.
If you do, or don't manage to claw back the extra few percent, is academic, as I would suspect, that the majority of people, using sensible bitrate files, it works admirably. :-)
Thank you. Kevin.