I set the filter delay because that was one suggestion made in the previous thread linked in the OP above. It seemed to me that the problem decreased after setting a delay. But thinking about it a bit, there is no logical reason why this would make any difference at all.
I've been running a sequence for about 2hrs now with filter changes every image and so far so good. I've not noticed any kind of slow down. But what do you mean by slow down? Just that SGP takes longer to move on to the next thing when a filter change or focus is called? I've not noticed anything like that.
I'm also using the old driver tonight.