Got a Threadripper 1950X (16 cores, 32 threads), 16 GB RAM (but probably running slower than it can). I’m now at around 103 seconds for Zen Garden on High.
Production quality took 239 seconds.
Please note that my RAM settings are probably not right yet. It’s running, according to , at 1330 MHz, instead of the maximum 3600. This will make a big difference. I still need to fix this.
EDIT: see my later post in this thread for results with correct RAM (at 3600 MHz) speeds. It’s a lot better.