Hi Mark,
After more testing I think DaVinci Resolve Optical Flow retime process with Speed Warp AI motion estimation is just as good as Final Cut Pro and Topaz Video AI. I am running Topaz Video AI on a M2 Mac mini with 16 GB RAM. Speed Warp is only in the studio version which is a one time lifetime purchase of $295 USD with free upgrades. Great software. I also tried a demo of Twixtor in Final Cut Pro but I don't think it's worth the price.
Tom