Slow GUI

I have recently upgraded to Pro 10 from 9.5. I have noticed that when I load NI StrayLight the GUI becomes really slow and very jerky in the editor window. It is unworkable. This was not the case in 9.5 where things worked smoothly with Straylight.

Anyone else had this slow GUI problem? I seem to recall v.9 started out like this.

Running Sierra on a MacPro. 3Ghz, 8 core, 64gb ram. Just installed the latest update which doesn’t help.