I just tried the patch released about 30 minutes ago to see if the frame rates improved. I'm happy to say it's much much better. I was getting rather good frame rates flying at around 1000 feet towards the harbour bridge, opera house, and City Centre, and my frame rate barely dipped below about 45 FPS. Granted I was flying the A5, but I don't remember the Cityscape Sydney ever being this good.
Well done with the patch.