Auto gives half the physical cores less one, at most 6: 2 on 6 cores, 3 on 8 (the count measured best on an 8-core CPU), 5 on 12. Four cores or fewer get none, and so does AMD's Windows driver for RX 6000 and older, where a player's device was lost with workers on and the cause is not known. The menu's row lists Automatic first with the count it gives on this PC, and the log says how many were started and why.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>