Adobe Substance Painter performance is not on par with legacy Substance Painter

I have noted in the Adobe version I am seeing a lot of issues in relation to:

Thumbnail generation (despite puting in a 2K plus cache) from a SSD.
Something simple can trigger an issue too like copying a smart material from one mesh to another.
Then when you save and nothing happens and try again you get two saves - example
https://gyazo.com/e52d5fd04300e7db4b7d4f1f00725f7a

At this stage it's a full freeze and the only way out is a force quit.

Any ideas on what is causing the poor performance on a Mac?

Finally it won't even generate a log so I can put in a bug report.  But something is really off with this version.