Sure. You have made a reference that, I think, is confusing two settings.

Options, Preferences, RealTracks, Speed up generation of RealTracks is a checkbox. If that's on, playback begins while the rest of the song is still regenerating. Hover over it and you'll see the tooltip description. Is your checkbox on?

"High" relates to the next item, Tempo/Pitch/Stretching Quality. That's a completely different setting, not related to speed up generation. Fast Boot is also a completely different purpose.


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