I was conducting a flight from KBOS to KMCO, the flight was during the day with little weather flying at about FL350 when my frame rates started to drop really bad to around 2-7 FPS. I have never had frame rates that bad even on the ground around major airports such as KDFW or KATL and this is happening at altitude. It started just south of NYC and continued until I quit the flight around Baltimore/DC area. Im thinking it could be related to AI aircraft? If I turn the AI off I will get frame rates back to around 40-60 but if I turn it on, even if to only 4 or 5% AI it drops back to 2-7 FPS? I have never seen this before and it only has happened in that one area.........anyone have this problem before or know a way to fix it?

Sounds like it's an AI problem. Could be the textures of some of your AI aircraft (AI textures need to be mipmapped or they will cause slowdowns, especially if there's a lot of AI aircraft around) or could be just that there's too much AI.

Have you added any AI planes recently? - some of them may have textures that are causing this.

Could also be a scenery issue - have you added anything new to the area?

 

If its an AI issue, only thing you can do really is start checking your AI aircraft through trial and error and see which ones are causing the problems. When you find the culprit/s you can either remove them or re-edit their textures with DXTBmp (http://www.btinterne...rams/dxtbmp.htm) and add mipmaps.