Apple M1, 2nd destination doubles CPU load

24" iMac M1, 2021

Big Sur 11.6

Wirecast 14.3.4

If I add a 2nd rtmp output using the same encoder preset, the CPU usage doubles.  If I record to disk and send to rtmp with the same encoder preset there is no CPU usage penalty. Stopping or starting the record to disk doesn't affect the CPU usage whether there are 1 or 2 rtmp destinations streaming, so it isn't a matter of the third output, it's that there is more than 1 rtmp active.  If I add a 3rd rtmp it triples the CPU usage. 

Currently upgrading to Monterey.

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