Quote from boleyd on May 18, 2012, 06:10
Is that the full operating commercial version?

No, it's the Developer Edition.
BTW I solved the problem simply disabling the Autosave option inside FSUIPC, now I have no stutters at all, even with NGX and heavy sceneries/complex WX, and a general performance very satisfying

Auto save is disables by default so I dont understand this" I disabled FSUIPC autosave" I have seen the stutters but do not have auto save enabled.

All, I have been frustrated with the stutters too, so I spent a little time this morning. My results are astonishing .

First my system - GTX570 - i2600k ** OC 4.7 ** 8gig mem
Addon Scenery - Orbx PNW
Settings: AG = Max ** Scenery Complexity - Max ** LOD - 4.5 ** Mesh - 100% ** Mesh Res - 5m ** Texture Res - 7cm ** Reflection - Sky Clarity - 80% ** Weather 70mi and High - Traffic (Default) 60% ** Road Vehicles 10% - Ships/Ferries - 100% ** Boats - 0% ** Global Texture Res - 1024 ** Locked @ 30 fps ** prepar3d.cfg - all default and no mods whatsoever
Nvidia Inspector - All as indicated by Kosta for FSX using the 1/2 refresh option only on the 301.24

All testing around the KSEA area

1. Driver change from 275.33 to 285.62 --- No change in performance - Stutters remained the same
2. Driver change from 285.62 to 296.10 --- No change in performance - Stutters remained the same
3 Driver change from 296.10 to 301.24 --- Almost stutter free. Did get some short lived stutters around KSEA looking towards Downton Seattle
Now, I had tried these drivers previously with no luck. The only difference was I selected Express Option and my only change was to leave out the NVIDIA Update option. When I installed these the 1st time a couple of weeks ago, I did an uninstall of my previous driver then rebooted into safe mode and ran a driver cleaner, then installed the 301's. This time I did not do an uninstall of the previous driver, but here is what happened. When I did the express install for the 301's it said it failed, but a driver had been installed. I think it was a 277 or something, but no control panel had been installed. So I rebooted and attempted the 301 install again. This time it installed with no issues. I went into Nvidia Inspector and created the new profile etc. Ran P3D and it was a difference of night and day.

Here is something that I noticed though. If I made any changes to any complexity settings and went back into the flight, I got stutters. So I saved the flight, unloaded P3D and ran P3D again using the saved flight which I had set as the default flight. Unloading and coming back in I had no stutters. I tested again by making changes this time by increasing traffic from 60-80. I resumed the flight and I got stutters. I unloaded and reloaded the flight and no stutters. I am really e bewildered with this. Don't get me wrong I am extremely pleased with the results but something happens when changes are made and the flight is resumed. I can only think of memory corruption. I am not technical enough to understand why this is happening. My last test was to increase the LOD from 4.5 to 5.5. I got stutters. So saved the flight, unload and reloaded and no stutters. I cannot run FSX with 5.5 without issues so LM has done something really right with these textures but there is still this perplexing problem. Just thought I would share this. As many have said with FSX "Your mileage may vary". I think FSX and P3D still have something in common.

Regards
Bob

I bought Prepar3D today and I'm seeing the same behaviour when comparing it with FSX. I have lowered all the settings to match my FSX install and I'm also an Nvida user (GTX 560Ti).

Its a shame, because the Orbx scenery looks spectacular. Anyway, can I downgrade to version 1.2 as people claim that version is OK?

Hey All,

We are working on the stutter issue, and hope to get it resolved for the next patch. Thank you for your patience!

Hello all,

After doing a lot of comprehensive internal profiling comparisons and combing through the revisions between 1.2 and 1.3, we believe we have found and fixed the performance problems introduced in 1.3. By default, all SimObjects are added to the default simulation scheduling group which has a minimum simulation rate of 16hz and a maximum of 120hz. The variable simulation rate caused some visual artifacts in one of our v2 features, so the default group was locked at 60hz for internal use. This change inadvertently made it's way into the 1.3 release, and resulted in performance degradation when the Prepar3D is running at less than 60hz.

Stutters are a complex problem which can result from any number of different factors, as is evidenced by the all the different accounts found in this thread. Since most accounts indicate that the best way to avoid stutters is to lock Prepar3D at 20-35hz, I suspect that this problem was affecting most of you, and likely contributed to your stutters. We can't claim to have put an end to stutters, but we are now confident that 1.4 will return Prepar3D's performance to where is was in 1.2. Thanks to everyone for your bug reports and for your patients with us as we investigate these issues.

Beau

In the meantime, there are a couple things you can do that we would appreciate feedback on:

1) At what level of AI traffic does the stuttering go away, or at least improve to the v1.2 perf.

2) In your Prepar3d.cfg, you can actually configure your simobject simulation rate. The following example should return the impact of simobject simulations on performance. Note that this will set it for the user's aircraft in addition to the AI which is a little different than v1.2 where we set the user to sim at a higher rate. You may not want to leave this in, but any feedback on these settings would certainly be helpful.

[sim]
min_user_sim_fps=16
max_user_sim_fps=120

Thanks,
Mike

In the words of Tom Lehrer in his song 'The Old Dope Peddler'. Here's and end to all your troubles, an end to all distress:

http://www.venetubo.com/fsx.html

Give them your specs and you will get an instant cfg file that can work miracles. I have a quad core machine and a Nvidia 570 card that should have given me all the fps I need but didn't find. This cured my problem and adding unlimited fps gives me an average of 30 - 60fps most of the time.

It is aimed at FSX but equally works for P3D.

Hope this helps.