[PD] irreversibly high CPU usage with 'use callbacks' (macOS)

[William Chang]

Hi all,

If I turn on 'use callbacks' in audio preferences, then turn on DSP, pd's
CPU usage goes to > 100% and stays there even if I turn DSP back off. This
sometimes locks up the GUI and I have to restart Pd. Without checking 'use
callbacks' it seems to be fine. Tried this with default audio devices, MOTU
Ultralite mk4, and Blackhole 2ch. Can anyone reproduce?

Pd: 0.52-1-really
macOS: 12.0.1
MacBook Pro 14" M1 Pro

Thanks,
Will
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