I actually did try synchron Pianos on my Macmini M1 16Gb, and I didn't notice any difference with my MacBook Pro 2019 i9 32Gb.
Only problem is my Audio interface has not yet a reliable/supported ASIO audio driver for silicon macOs, then I can't say if latency and buffer parameters are correct. But loading was fast and playback fine with 64k (overload with long sustain pedal reaching more than 300 voices) and perfect with 128k buffer, and my Kawai VP-1 was very responsive and natural to play.
All the rest of VSL software is running surprisingly good as I'm reporting in another post.