I can tell you from using stem splitters in Song Master Pro and Presonus Studio One 7 that splitting stems takes several minutes on my rather powerful PC. It is the one audio thing I do that takes the longest time, so I don't think the times you report are unreasonably slow at all.


BIAB 2025 Win Audiophile. Software: Studio One 7 Pro, Swam horns, Acoustica-7, Notion 6, Song Master Pro, Win 11 Home. Hardware: Intel i9, 32 Gb; Roland Integra-7, Presonus 192 & Faderport 8, Royer 121, Adam Sub8 & Neumann 120 monitors.