Hi,I have no idea why sometimes out of the blue like today flying from PHNL Hawaii to SFO I just get this massive performance hit in the NGX. It normally average 18fps under the most dire of circumstances and today leaving PHNL FSDT I am getting 8 and then on the way into SFO I am getting 8. This happens untill I go cold and dark and then I am back up to 18. But wait there's more! When I fire up the aircraft and everything I am still getting 18 and can now taxi around SFO at 18 with all the same circumstances as before. So most flights out of the heaviest of payware scenerie complexities and 2048 REX clouds my fps never drops below 15-18 and is smooth but every occasional flight I get this issue untill I go cold and dark, which is not an option in the middle of a flight.And this is irrespective of any settings. I can turn some of the heaviest hitting sliders down to 0 and it has no effect. I have everything maxed and my system can handle it but I suspect some typical FSX junk code along with my bizzilions of add ons and config settings might have something to do with it.Could this be one of those memory leaks?Thanks for any advise.

I recently had a similar experience. It turned out to be back-up running in the background, which doens't hit the CPU much but the disk i/o channel gets slow. Lesson learned. Pull up the task manager and see what is busy.

Is it happening on a particular interval?

Do you find your frame rate loss occurs as you approach water, and fly over water?Set nvidia inspector anisotropic filtering to "Application Controlled" and in FSX tick Anisotropic filtering. The frame rate loss over REX water will then be gone.I discovered this the other week.

Thanks for the replies.It seems to happen during the start up sequence from cold and dark. Yesterday, while testing this, I noticed the fps took a sharp dip after I had trimmed for takeoff. Coincidentally I had also been having difficulty using my joystick buttons to move the trim weel before engine start. In the 737 should you be able to run the trim with electrical hydrolic systems a and b off? Because I have always been able to trim with them off and would do so as part of my setup procedure after imputing the cg% into the FMC. Lately however I have not been able to move the trim wheel or move the throttle/reversers or activate the AT arm switch w/o activating electrical hydrolic systems a and b to pressurize the system first. If this is specific to the 737 then how come it only does this some times?So maybe this bug is what is causing this issue with the fps loss.I am just shooting in the dark here but I did notice that after I had activated the trim, that is when the fps dropped for the rest of the period. I'll have to do more testing.

Do you find your frame rate loss occurs as you approach water, and fly over water?Set nvidia inspector anisotropic filtering to "Application Controlled" and in FSX tick Anisotropic filtering. The frame rate loss over REX water will then be gone.I discovered this the other week.

This is good advice, and I also drop my water settings to 2x low

The frame rate drop I speak of happens with REX water I believe it's certain wave selections that do it. Dropping water to a lower setting in FSX helps, as you'd expect, but Inspector aniso set to application controlled eliminates the issue completely, enabling the higher water setting to remain.I was getting a 50% drop over water, no drop at all now.