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    Hi everyone.
    There appears to be an issue (at least for me) if you use an older version of Pete & John Dowson's FSUIPC7 and the new SU12 update.
    When starting MS2020 this morning to test out the new SU12 I noticed that the sim stuttered rymatically once every second, literally as regular as clockwork, no pun intended.
    If you run the frame counter in dev mode you can see the frames drop every second at the same time.
    Made no difference if on the ground or in the air.
    I worked through the running addons on my system turning each off in turn and checking the result, and as soon as I killed FSUIPC7 the stutters stopped.
    PACX (an addon to give crew announcements) which I run uses FSUIPC7 to communicate with the sim, and is the only addon I use that does.
    Killing PACX alone made no difference, but as soon as FSUIPC7 was stopped the stutters completely disappeared.

    Checking Pete's website it shows a new version just released today the 22 MAR 2023 V7.3.19
    Having now installed that and running it the once per second stutters appear to have gone.
    Will do more extensive testing later as I ran out of time, but it appears to be the only thing causing this behaviour, at least for me.

    Looking further into this it seems some users reported this with the SU12 beta, and as I did not use the SU12 beta this effect was only seen today for me.
    Hello, edit: on a hunch I tried uninstalling an reinstalling FSUIPC7 (but without any of the "extras" selected) and now I can't reproduce the issue. ignore what's below I recently for the first time needed to install FSUIPC7 for a new piece of software (A Pilot's Life 2), and have noticed that th...

    You can download the latest version of FSUIPC7 here:

    Hope that helps anyone who suffers the same problem and who use FSUIPC7.
    Thanks to Pete Dowson for the update too.


    Check out this video posted yesterday the 24 MAR 2023.

    FSUIPC the Discord! out the Facebook Page!

    Not only does it confirm what I found, but it also adds an edit of the newest FSUIPC7.ini file to further stop the once a second stutters.
    Basically open the FSUIPC7.ini file in the installation directory with notepad, and add the line NumberOfPumps=0 at the end of the [General] section.

    ​Credit to the Youtube video author Noctural for the extra information.
    Last edited by Steve M; 25Mar2023, 18:16.
    Steve Mel

    Thank you for posting
    Chris Alevritis-KPHX


    • Steve M
      Steve M commented
      Editing a comment
      You're very welcome Chris, and thank you for saying so.
      Just hope it helps someone from pulling all their hair out trying to find what is killing their frames after all the updates. 😉

    Thanks for report.


      Hey guys! I had a similar issue but i don’t run FSUIPC7. Not sure if there’s something else causing this but I’ve had nothing but major issues after SU12 not just with the pmdg 737 but in general. The problems are just more pronounced when I’m in the 737. But any in game aircraft will do it to me no matter where I’m at in the world, traffic on or not. Doesn’t matter the performance issues I’m having are the only consistency I’ve had with the simulator. Inside or outside of the airplane the camera glitches all the time when i move around no matter how slowly. I’ll drop from 30 fps to single digits when moving the camera usually down to about 8 fps


        Happened to me, just disable the first box in the save function of FSUIPC.


          Originally posted by pete_auau
          this seems to fix the stutters that some users are having with fsuipc

          Hi Peter,
          This is exactly the same instructions as I have already provided.
          Nothing wrong with another video if it helps explain things better of course, but the information is the same.​
          Steve Mel