Performance logging for checking for preferred device
Checking if we are using the preferred device is fast: ~0.20 ms
Checking if the preferred device is available (enumerating devices
until one with appropriate name is found) is slow: ~3ms
This may not be a major problem:
- It only happens during the idle unbuffered call. IE. the synth is done
playing and there is no pending buffer.
- It only happens if not using the preferred device.
Possible mitigation: start an async task to check for the preferred
device, and when the result is available on a subsequent idle unbuffered
call, then switch.
