DirectX 10 preview or DX9?

12 hours ago, vortex681 said:

That's normal. Turn towards a large city when you're in flight and you'll see your FPS drop. The sim is having to work much harder to create all the extra detail you see.

Did you mention what screen resolution you're using?

I guess I've solved half of the FPS problem:
I attached a second Display Card to the system "NVIDIA Geforce GTX 580" (without de-attaching my first display card), and then I ran FSX from the monitor which is connected to this second card.
This time FSX ran perfect :)

It was nearly always at target FPS 20/s.

Now I can know that problem is related with my display card NVIDIA Geforce GTX 950 .

But I still don't know what is the problem with card. I re-intalled the latest Nvidia Driver for it and tried again, but FPS was stil around 7/s with this card.

I am not sure what can I try more..

PS.
By the way, this first card was working perfect with Grand Thief Auto 5 without any performance problem. It seems there is something not matching with my NVIDIA Geforce GTX 950(or settings of card) & FSX...

17 hours ago, damlays said:

I hope this link https://ibb.co/e3YpM5 can show the image.

At the bottom of the image, I clicked on Embed Codes and then copied the BBCode link and pasted it here:

Damlays

Did you ever find a solution to this problem? 
I have a similar one on this thread

"New PC, Fresh Install, Flying around AUS"

https://www.avsim.com/forums/topic/506423-new-pc-fresh-install-flying-around-aus/#comment-3591348