OKAY- after testing last week, we THOUGHT we had solved the performance issues. by apparently, we have not. The last time I tested it, we were at around 30 FPS in-editor - but when I tested it again, now- we're getting around 5 FPS.
I am looking into this.
Sorry for this continued lapse in oversight - but what can we do when it DID work, and then stabs us in the rear?