Framerate for that location was 27 - 32
I don't think it's the PC, rather the route. Since I originally installed it I've added two beta u/grades which have put some small sections of ballasted track in, mainly at turnouts. I've still got the original route on another computer so will show a couple of screenies from that.
Methinks might remove the route and reinstall the original one without the u/grade and will probably have to do the acts. again as there are changes in the track layouts between the the two.
The shots at the top of the page took an hour to set up, eighteen driveable locos! (':(')
Chris