HA! awesome find and thanks for applying it!
It does indeed make a difference, my simple test was loading the large Dexter patch from @LarsBjerregaard (patch 6).
And starting to browse the web or use other applications, with the current version Rack this would result in crackles.
With this Rack fork that has the realtime option enabled for Mac, there is no crackling!
(Mac Mini M1)
@Vortico could you please add this to the current official 1.6.x build?
@heapdump have you seen this? might be interresting for your ARM test build?