Yah it was over a year ago so my memory is hazy but as far as I know I tried to do exactly that. I watched the WWDC talk and made sure I met all the conditions they say, and tried to use Instruments and Is It Snappy to verify it and I didn't seem to be triggering compositor bypass and had no way of figuring out why not. What I really want is a single open source demo app on Github where someone has said "I tested and this triggers Metal compositor bypass and I confirmed with Instruments and/or Is It Snappy"