[dominicperry]

Tried again here with the patch you mentioned - everything at 96KHz - standalone it hardly uses any CPU as measured with iStat menus.
Inside PT, with a 64 sample buffer, PT usage meter says CPU is 40% but peaks at 72% with occassional red 100% blips. Lots of CPU plusing on all cores.
But at 128 samples it's much more benign (about 30%, with no pulsing) and avoids the big peaks.

I'm using an RME Babyface for testing, so of course the interface drivers are very good. System specs are almost identical but I'm using Monterey 12.2 beta 1 (21D5025f)

Dominic

MBP M1 Max 32
64GB RAM-2TB
OSX 12.2 Beta 1
PT 2012.12
Omnisphere 2.8.2c ARM