That performance hit shouldn't happen at all... Have you tried disabling the Creators update's full screen optimizations on PS2? Right clicking on the PS2 shortcut - properties - compatibility - disable full screen optimization. There's a chance that's interfering and causing a performance hit for us.

Can you try disabling the geforce experience / shadow play if you run that to see if that's somehow causing a problem with us?

One last debugging tip, you can turn on Impact Debug Display under RT display options. It will give an estimate of how much cpu time our overlay is taking up from PS2. Having it on actually lowers performance slightly since it's doing additional profiling and text display. (The number really shouldn't go above 5% and that's pretty high) but in your case I'm interested since you're getting a 50% performance impact at those amp stations.