I remember X-Plane 6 did this. You would get a dialog box asking you which airport, and which airplane, before the app started. A feature I liked and I wish could be toggled back with this new version. All we can do is ask!

Hi Simon,
This optimization tries to let the CPU work done by the Nvidia driver run on a thread separate from the application’s rendering thread. In theory if an app is CPU bound and is causing the driver to chew a bunch of CPU, this is a win.
In X-Plane’s case, I _think_ it will cause a massive performance loss. We do a few things that are legal OpenGL but that the threaded driver can’t handle in a performant manner. So you can try it again, but generally forcing it on causes a massive fps fail, and it should be off for X-Plane.

Thanks Ben, I can see some (20%?) improvements in frame rate now on my 3 ATI GPU systems! Still dreaming of constant 22-25fps on my big i7 PC 5monitor system, but it’s coming. Keep going on! Good job!

AHA! I can reproduce this now. It happens every time at WILLAPA HARBOR. I’ll take a look! Thanks for the help.

Ben, what is Nvidia threaded optimization? Should it be forced on via the Cntrl panel?

B2 is really good for me, tx! I am leaving HDR on for good now, although I’ll see how the CRJ 200 goes soon..

Yes, I have been able to reproduce this at least 3 times using 10.02b1 and 10.02b2. My plane was on the runway at WILLAPA HARBOR which I moved to with Select Global Airport. I filed a bug report on the X-Plane bug reporter page. The log.txt which I attached was filled with “No suitable runway found” messages.

Can you reproduce this every time? Where was your plane at the time? Was it on the ground at KOLM as well or was it in the air? If it was on the ground, was it on the runway or at a ramp. Please send the bug report info to me at chris@x-plane.com

X-Plane seems to be stuck in an infinite loop of trying to place airliners on the tarmac at KOLM, however it cannot find a configuration where none of them overlap/collide. I will add screenshots to the bug report.

Yes, “Threaded optimization” is manually turned on. I am filing a bug.

Do you have the nvidia threaded driver enabled?

If you can get a screen shot series or movie of the jittering airplanes, please file an ATC bug with the bug report form and include the log.txt (after quitting) and the pictures/movies.