FSX & P3D stutter in VisualFSX

[Chris Stanley]

Me too. I'd also be happy to contribute to Garry to get this right over a network. With the "real" weather box checked I also don't seem to be getting the visual update for the weather. Fine on TO but quickly goes CAVOK for the rest of the flight. XView is fine, as with ahaka. As I said, happy to get involved in any way. Thanks. (I too have a top-of-the-range water cooled system which runs FSX full on with the PMDG 777 at UK2000 EGLL at 35fps no problem but then runs out of VAS!)

[Garry Richards]

Hi guys,

I am on holdays for the next month or so and will be able to investigate and discuss more fully on my return. For now you might like to try reducing the resource usage by FSX/P3D. VisualPSX uses some of the computer's resources and SimConnect uses some of FSX/P3D's resources because it is injecting position and attitude data continuously. You could try locking the FSX/P3D frame rate at a lower value or reducing one or more of the high load scenery effects to see if that removes any stuttering.

Cheers,

[ahaka]

Don't know if this can give any clues to anyone, but in the external view, whenever there is any movement, it seems that the whole external model of the aircraft is jittering around at a very high frequency, if I increase simulation rate in FSX or P3D, the frequency of the jittering gets higher and higher. Interestingly, when stopped on the ground, for instance and panning the cameras, it's as smooth as silk,as long as the aircraft is not moving.

This occurs on all my systems, network or no network...

[JP59]

Hi guys,

I am on holdays for the next month or so and will be able to investigate and discuss more fully on my return. For now you might like to try reducing the resource usage by FSX/P3D. VisualPSX uses some of the computer's resources and SimConnect uses some of FSX/P3D's resources because it is injecting position and attitude data continuously. You could try locking the FSX/P3D frame rate at a lower value or reducing one or more of the high load scenery effects to see if that removes any stuttering.

Cheers,

Hi Garry,

I have the same issue and I can confirm what the other gentlemen said : it is definitively not a FSX performance computer issue. I have an I7 extreme system OC at 5Ghz, running FSX very very smooth (40-50 FPS in EVERY circumstances) and at the moment I connect Visual PSX the stutters begins, especially during turns. Again, thanks for your never ending investigations and support !

[Will]

Hello Jean-philippe, just curious, when you're NOT running VisualPSX, do you ever have performance issues with FSX? Is there any time when it stutters or bogs down, or is it solidly at 40-50 fps no matter what?

[JP59]

Hi Will,

As I said, never had stutters with FSX alone. But when Visual PSX goes on, everything in the same conditions (cockpit view, same scenery,...) the stutter begins immediately and never stops. I first though about a network issue because my PSX server and Visual PSX runs on a different computer than FSX, and it looked like FSX was "waiting" networked data from Visual PSX, not coming fast enough, but some other guys reported the same issues with PSX, FSX and Visual PSX on the same computer. So I thing about an issue from Visual PSX itself.

[Phil Bunch]

Here's an improbable but technically interesting thought (I wouldn't dignify it as a theory or hypothesis):

Is it possible that the update rate frequency and the frequency (or frequencies?) at which FSX is updating one thing or another are interfering with each other in a way that creates lower frequency "interference patterns" which might be perceived as stutters or vibrations?  This phenomenon of interference of course occurs in all sorts of physical situations.  Another improbable theory would involve Moire patterns, caused by undersampling a signal stream, especially a periodic or mostly periodic signal stream.

For more on one form of this theory, see here:

http://en.wikipedia.org/wiki/Interference_%28wave_propagation%29

and

http://en.wikipedia.org/wiki/Moir%C3%A9_pattern

Please excuse this probably irrelevant post - I decided to post it on the off chance that mixing PSX's periodic emissions of 747 parameters is being mixed in an accidentally unfortunate way with FSX's activities.

[Rob Harris]

Hi All,

This is my first post on the PSX Forums but been round here a while but feel the need to post as have the same stutters with Visual PSX and P3D.  For info, I am using P3Dv2.3 on a super fast PC which runs super smooth...and I have VisualPSX on my PSX server which is also high end.  Both connected via a gigabyte wired network.    Now, I have found the source of my "big" stutters...   I've tried this on TNCM as it's surrounded by sea and there is nothing to interfere with my experiment.... When flying away from TNCM it's nice and smooth.... turn around and approach... it starts to stutter.... if I carry out this activity whilst observing the  VisuaPSX status window, I notice that the stutters start at the exact same time VisualPSX starts to handle runway offsets... in fact, it starts to continuously run this task time and time again and only when this stops, the stutters stop...  Now, this is not to say it's silky smooth when this is not happening, it's still suffers from micro-stutters and is not quite smooth enough for stick work... so other problems exists also - but this seems this biggest cause of temporary big stutters...

[Garry Richards]

Hi Rob747,

Thanks for those observations and congrats on your good experimental design. The last update to VisualPSX fixed an offset problem but your results suggest that the fix has introduced a new bug. I will look into this in a few weeks when I return from holidays.

Cheers,