Ticket submitted, response came... another limitation of the OS and no help. Tiles doesn't cache and that's that.
I'm trying hard to love stardock software but the general compatibility level with all my products (I bought the whole package) is far below what I've come to expect from commercial software.
I don't consider not running Tiles a fix for this problem. and the thrashing is even worse now. I even moved my pictures out of the stock windows location as I was told I had too many pictures. Still happens.
Tiles is now uninstalled.