8 hours ago, Sunshine13 said:

How high is your TLOD in graphic settings in sim ?  No reason to have at 400/max, or even 300. 

right now it varies between 150 and 200 and my render is at my native resolution of 5120x1440.  The group that built my PC said it should always be at my native resolution. 

 

12 hours ago, Zimmerbz said:

believe I have vsync on but not sure what floating is.

By "floating", I meant non-vsync. Since you reported further down in the thread that you had determined that your system was main thread limited, it means that vsync is actually off. If it were on, you would always see that you were GPU limited, or at least that 's what I see when I turn on vsync.

So my suggestion would be that you turn on vsync and limit your frame rate to 30 fps, at least as an experiment. If you can get your monitor to display 30 fps, then run vsync at 100% of the monitor rate. If it can only run at 60 fps, then use 50% of the monitor frame rate. 

And just to confirm, if you fly into/out of default airports, do you see the stuttering?

4 minutes ago, jrw4 said:

By "floating", I meant non-vsync. Since you reported further down in the thread that you had determined that your system was main thread limited, it means that vsync is actually off. If it were on, you would always see that you were GPU limited, or at least that 's what I see when I turn on vsync.

So my suggestion would be that you turn on vsync and limit your frame rate to 30 fps, at least as an experiment. If you can get your monitor to display 30 fps, then run vsync at 100% of the monitor rate. If it can only run at 60 fps, then use 50% of the monitor frame rate. 

And just to confirm, if you fly into/out of default airports, do you see the stuttering?

I don't see stuttering at defaults.  Having said that, it has been a while since flying into or out of default but the last time I did, it was smooth

Would DX11 or DX 12 cause any of this?

9 hours ago, pmplayer said:

I think al around you will not get this Sim total stutterfree , that is just an Illusion

I disagree--stutter-free is the norm in and out of the most complex airports the world has to offer in the PMDG 738 and FBW A320NX, and I'm at all Ultra, except TLOD is 120-200 depending on plane and setting, and I have FSLTL's traffic well controlled, and I'm using 3440x1440 which is far easier on total performance demands than 4K is going to be.  I've tried my darndest to share this but I think it largely falls on def ears and probably because of the belief you just stated, 'just an illusion'. 

1 hour ago, Zimmerbz said:

Would DX11 or DX 12 cause any of this?

May or may not help, but whenever you change from one to the other do a quick clean out of the DX Shader Cache:  go to Disk Cleanup > C:/ drive, check the box for DirectX Shader Cache and delete it.

1 hour ago, Zimmerbz said:

Would DX11 or DX 12 cause any of this?

Hard to say, but I have gone back to DX11 because the use of DX12 on my system results in an unacceptable Render Latency value over 100 mS.

I am running stutter-free at Ultra settings at 4K at all but the most complex airports locked at vSync of 30 fps. At those complex airports, I will go back to High End graphics settings. And that's with FSLTL running as well.

System info in the signature. I'm not a tweaker, so I tend not to fuss with the individual settings, but just use those provided by MSFS. I aslo make use of the convenient image scaling settings in GeForce Experience (horror of horrors to the tweaker community), which allows me to set Render Resolution and Sharpen values easily.

We all have different ideas of what is acceptable quality and performance in our flight sims. Find yours and have fun.

I did a flight today from Vertical Sim KTPA-FSDT KCLT in the Fenix and kept FSLTL on.  I had the smoothest flight in a while (knock on wood) and didn't have a single stutter.  The only differences I made were the following (might be a coincidence or luck on this particular flight but I was very pleased i had no stutters):

- Switched back to DX 11

- cleaned my DX cache per the suggestion above

- went from Vsync 100% refresh to 33%

I know this is one sample flight so I'll report back again with a few more under my belt.