A workaround for FPS drop after a long flight

[ProofPandora683]

In this post:

Drop in performance

I also wrote a topic on this yesterday because it affects me in exactly the same way. However, I have also found that besides turning off the AI traffic, setting the cockpit refresh rate to low brings tremendous FPS. Flying now with the 787 for 4 hours and high graphics setting to 60 FPS continuously.

Chemic3l gave me the solution:

During flight, I paused, went to options and turned off and then back on again AI traffic. My frame-rate jumped instantly from 15 to 50 and I finished my flight with perfectly smooth frame rates.

Hope this also works for you.