[Darryl Ramm]

Did you ever actually try to troubleshoot any issues on your old computer? It was your decision to buy a new iMac Pro — why not ask here for advice before doing that? I would have only done that after carefully troubleshooting everything else.

Maybe you should go look again at the old computer and see if you clean up/troubleshoot the software and plugins there if will work OK for you. Maybe consider upgrades to DRAM and disk would have helped there as well.

And forgot earlier: are theses systems fully optimized? Get every last optimization done, however annoying, at least to start with. If you did that before go check again.