I booted up a 20 core, 2.5GHz VM on the Google Cloud for running my optimizer over a good sized data set. I'm not seeing NT8 use up the available CPUs for the optimization. Here is a sample from the process monitor during an optimization that had been running for about 20 minutes.
Also, the ETA doesn't seem to be accurate:
The ETA counts down (quite quickly) from 24:59:59 to 00:00:00 and then starts over again.
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