Traffic???

The last time I used Fly!! was shortly after it's release when I was running it (or trying to) on an 866MHz system. Since then I have trashed that system and am now using a 2.4 GHz system and just reinstalled Fly!! and all I can say is WOW!!! What a difference. This sim is beautiful now and runs great, that is with one simple exception. I still can't figure out why just adding the AI aircraft to "10" can still practically slow my system to a crawl.. Is there any fix for this? If not, has there been any other add-on created that adds AI "flying" aircraft to deal with? Thanks for any and all help.Shawn