Madcap - I have 100% stock AI as well, my screenies are the default.
Scott - I'm not discouraged I'm simply not that bothered by AI traffic. It hurts my framerates that much that I live without it quite happily. For example at a graphics level like my shots I can expect 14-20FPS in most situations going up to 40 at 20,000 feet with 0% AI. I was getting 6-8FPS during those shots. My computer can handle the terrain and so on, it just can't handle the traffic.
When I get my next upgrade (RAM) I will probably see an improvement.
Will