2. using PortAudio adds a considerable overhead. (JACK timings and
the PortAudio timings are clearly in two different leagues, separated
by a factor of 1.5 up to 5). the separation is most prominent in the
tests that do not involve the GUI (suggesting that the GUI overhead
hides the overhead from the audio backend)
So it seems like portaudio is a bit slow to initialize on macOS. FYI,
the initial pa_init() call happens in sys_get_audio_devs() via
sys_set_audio_settings() in sys_arg_parse() resp. sys_loadpreferences().
I don't think this can be avoided in a reasonable way. It hasn't really
been a problem in the past neither.
ad code:
my gut feeling tells me that there are two promising candidates:
- the changed GUI startup protocol
- something about the audio backends
I would rule out the latter because AFAICT the audio setting and
preference logic hasn't really changed between Pd 0.54 and 0.55.
Christof
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