After SU11 I noticed a big drop in video performance. Tried multiple graphic changes but nothing helped. Renamed the Community folder and performance improved. Of course, I put it all back and slowly the issue returned. I reduced the Simple Traffic setting from Ultra to high and the performance went back to normal. Has anyone else had this issue?

We do believe SU11 increases the traffic, so that would match well.

 

Always keep in mind Simple Traffic only repaints that aircraft, what is spawned where and how it behaves is simply not set by Simple Traffic.