I'm trying out the demo for X-plane 11 but there seems to be a problem. Whenever I approach an airport such as SEATAC, the FPS drops drastically. When I look away from the airport, the FPS is really smooth. This also happens when on ground in the airport. It lags when I face a certain direction (usually left when parked up). I would very much appreciate it if somebody could help me with this problem. I aspire to become a pilot and X-plane 11 would really help me get a head start. Included is the log.txt file.