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  6. Performance Issues with Starship – Sporadic FPS Drops

Performance Issues with Starship – Sporadic FPS Drops

Scheduled Pinned Locked Moved Starship
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  • R Offline
    R Offline
    rafgath
    wrote on last edited by
    #6

    After another two trouble-free flights, the same thing happened again. I'm attaching a video that shows the whole situation. The washed-out colors are due to using HDR, which OBS doesn't handle well. Also, when I pressed the record button, it set the mixture to lean because, as it turns out, I have the same key mapped for both that function in MSFS and for recording in OBS 🙂 Either way, you can see how the image isn't smooth due to the low FPS, but once the Pilot Avionics are turned off, the FPS returns to normal.

    https://www.youtube.com/watch?v=C1MDrw8G-DU

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    • Black SquareB Offline
      Black SquareB Offline
      Black Square
      Black Square Developer
      wrote on last edited by
      #7

      Thanks for sharing a video. That's interesting that only the pilot avionics switch causes the change, as there isn't much that's exclusive to that switch. Unfortunately, without the DevMode FPS counter that I mentioned above, I don't have too much to go off of. If it happens again, perhaps try the other two switches to see if they make any difference first, or if it really is only the pilot's avionics switch. That would be helpful, as well as a screenshot of the FPS counter with all the graphs. Thanks for volunteering to help! I'm very sorry you have to deal with this. It is so upsetting when you're one of the very few with a problem like this, and the developer can't reproduce it.

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      • R Offline
        R Offline
        rafgath
        wrote on last edited by
        #8

        It happened again right after the last flight, so I'm uploading a new video. I hope it helps, at least a little, to find the cause. Turning off the pilot avionics solved the problem.

        https://www.youtube.com/watch?v=T6gphlE15S0

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        • Black SquareB Black Square

          Have you downloaded v1.1? I had some complaints that I could not reproduce of performance degradation on long flights in v1.0, but that seems to have been solved with v1.1. Actually, I've been quite thankful that I haven't had any repeat comments about performance issues after v1.1. Given the fact that you say it doesn't occur every time, nor depends on the duration of the flight, I can't imagine what could be causing such an issue within my code.

          If you want me to look into this, I will need some more information, like what other addons you have installed, what you were doing when you noticed the issue, whether you imported a flight plan, your typical flying habits and mission, just anything that might help us find the cause of the problem.

          N Offline
          N Offline
          NavyNhok
          wrote on last edited by
          #9

          @Black-Square Hello, The actual version is V0.1.1 ?

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          • N NavyNhok

            @Black-Square Hello, The actual version is V0.1.1 ?

            R Offline
            R Offline
            rafgath
            wrote on last edited by
            #10

            @NavyNhok said in Performance Issues with Starship – Sporadic FPS Drops:

            @Black-Square Hello, The actual version is V0.1.1 ?

            Yes. Screenshot 2025-07-15 182948.png

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            • Black SquareB Offline
              Black SquareB Offline
              Black Square
              Black Square Developer
              wrote on last edited by
              #11

              Thank you. That video showed exactly what I was looking for. Notice how the every-other-frame stutter is in the "manipulators" thread? We don't have any documentation on what this actually includes, but it's not usually anything I affect as a developer. I have brought this strange behavior to Asobo's attention, but they have shown no interest yet.

              You can read about others encounters with this in v1.0 (I thought it was solved for 1.1, as nobody else has reported it again) here, and a BIOS setting that might have an important impact on this issue. If you try it, please let me know if it makes a difference for you!

              In the meantime, I will investigate what systems are connected only to the pilot's avionics switch (more complicated than it sounds with how I've programmed Starship's avionics), and I might give you some more things to try, if you were willing. Thank you!

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              • R rafgath

                @NavyNhok said in Performance Issues with Starship – Sporadic FPS Drops:

                @Black-Square Hello, The actual version is V0.1.1 ?

                Yes. Screenshot 2025-07-15 182948.png

                N Offline
                N Offline
                NavyNhok
                wrote on last edited by
                #12

                @rafgath Thanks!

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                • Black SquareB Offline
                  Black SquareB Offline
                  Black Square
                  Black Square Developer
                  wrote on last edited by Black Square
                  #13

                  I was just testing this a little, and I realized there is something you could try that would be immensely helpful. Sorry to ask for help, but it's very hard troubleshooting something that you can't reproduce on any computer you have access to, as you might imagine.

                  Next time you see this happening, could you try pulling the following circuit breakers, in this order, and see which one has an effect on the problem?

                  1. RADAR
                  2. ND No. 1
                  3. PFD No. 1
                  4. CDU No. 1
                  5. HF
                  6. ASI No. 1
                  7. ALT No. 1
                  8. SDU No. 2
                  9. ADC No. 1
                  10. Clock PLT
                    ~Only proceed to these, if none of the above made a difference~
                  11. DME No. 1
                  12. FCS No. 1
                  13. FMS No. 1
                  14. ADF
                  15. RAD ALT
                  16. ATC No. 1
                  17. NAV No. 1
                    Finally, if none of those made a difference, turn off the pilot's avionics switch for one final test.

                  That should really help narrow things down. I know that might seem like a lot of work, but hopefully it will go very quickly. Ironically, it's also not dissimilar from what a real aircraft might be asked to do by his maintenance technician to troubleshoot the real aircraft.

                  R 1 Reply Last reply
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                  • Black SquareB Black Square

                    I was just testing this a little, and I realized there is something you could try that would be immensely helpful. Sorry to ask for help, but it's very hard troubleshooting something that you can't reproduce on any computer you have access to, as you might imagine.

                    Next time you see this happening, could you try pulling the following circuit breakers, in this order, and see which one has an effect on the problem?

                    1. RADAR
                    2. ND No. 1
                    3. PFD No. 1
                    4. CDU No. 1
                    5. HF
                    6. ASI No. 1
                    7. ALT No. 1
                    8. SDU No. 2
                    9. ADC No. 1
                    10. Clock PLT
                      ~Only proceed to these, if none of the above made a difference~
                    11. DME No. 1
                    12. FCS No. 1
                    13. FMS No. 1
                    14. ADF
                    15. RAD ALT
                    16. ATC No. 1
                    17. NAV No. 1
                      Finally, if none of those made a difference, turn off the pilot's avionics switch for one final test.

                    That should really help narrow things down. I know that might seem like a lot of work, but hopefully it will go very quickly. Ironically, it's also not dissimilar from what a real aircraft might be asked to do by his maintenance technician to troubleshoot the real aircraft.

                    R Offline
                    R Offline
                    rafgath
                    wrote on last edited by rafgath
                    #14

                    @Black-Square Sure, as soon as it happens again, I'll check it like you asked.

                    One question. You listed FCS No. 1 twice. What should the second one be instead of FCS No. 1

                    And below is a screenshot from my BIOS.

                    IMG_4391.JPEG

                    Black SquareB 1 Reply Last reply
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                    • MD82M Offline
                      MD82M Offline
                      MD82
                      wrote on last edited by
                      #15

                      I believe C-State Control needs to be enabled?

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                      • J Offline
                        J Offline
                        jmarkows
                        wrote on last edited by
                        #16

                        The BIOS pic has me wondering: the people with FPS issues, could there be thermal throttling at play? My newest build has a 14th gen i9, and for those who follow tech is the Intel cpu that was famously self-destructing on launch. I came in late, but had some issues with stability that were resulting in my CPU asking for (and getting!) upwards of 500A.

                        I have since become keenly aware of CPU voltages and temperatures lol, but with some BIOS configuration it's been drastically reduced.

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                        • R rafgath

                          @Black-Square Sure, as soon as it happens again, I'll check it like you asked.

                          One question. You listed FCS No. 1 twice. What should the second one be instead of FCS No. 1

                          And below is a screenshot from my BIOS.

                          IMG_4391.JPEG

                          Black SquareB Offline
                          Black SquareB Offline
                          Black Square
                          Black Square Developer
                          wrote on last edited by
                          #17

                          @rafgath Sorry, FMS No. 1.

                          R 1 Reply Last reply
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                          • Black SquareB Black Square

                            @rafgath Sorry, FMS No. 1.

                            R Offline
                            R Offline
                            rafgath
                            wrote last edited by rafgath
                            #18

                            @Black-Square Another flight and another FPS drop (maybe because it's exactly the same flight every time). Please see the video link below. Luckily, I didn't have to click too many circuit breakers, as everything returned to normal after turning ND No. 1 off and back on.

                            https://youtu.be/4aDTWlVdmPM

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                            • Black SquareB Offline
                              Black SquareB Offline
                              Black Square
                              Black Square Developer
                              wrote last edited by
                              #19

                              Very interesting! That's admitted a little strange, since ND 2 runs the exact same code... This might take a little more experimentation. I will look through things later and see what I can come up with, but on your next flight, try configuring ND 2 to show exactly the same as what ND 1 is showing, and see if the problem is exhibited by both units. Thank you for the help!

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                              • W Offline
                                W Offline
                                Wael
                                wrote last edited by
                                #20

                                I’m having a very similar issue.

                                After about an hour of flying, I get a major FPS drop — from 160 down to around 40 — and GPU usage drops to 0%–30%.
                                When I press ESC and pause the flight, GPU usage returns to normal, but as soon as I resume, the performance drops again.
                                Everything runs perfectly at the start of the flight — this only happens mid-flight.

                                Specs:
                                • CPU: AMD Ryzen 7 9800X3D
                                • GPU: RTX 5080

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                                • Black SquareB Black Square

                                  Very interesting! That's admitted a little strange, since ND 2 runs the exact same code... This might take a little more experimentation. I will look through things later and see what I can come up with, but on your next flight, try configuring ND 2 to show exactly the same as what ND 1 is showing, and see if the problem is exhibited by both units. Thank you for the help!

                                  R Offline
                                  R Offline
                                  rafgath
                                  wrote last edited by
                                  #21

                                  @Black-Square Okay, I'm uploading another video showing the FPS drop. As you can see, only disabling ND No. 1 helped. Turning it back on doesn’t cause the drop either. But if we look at all three videos I uploaded, they’re all from the same route, and the issue generally always occurs around the same point — just before reaching the ROGAL point. Maybe it’s a coincidence, maybe not.

                                  https://youtu.be/mEYfGcpgg50

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                                  • Black SquareB Offline
                                    Black SquareB Offline
                                    Black Square
                                    Black Square Developer
                                    wrote last edited by
                                    #22

                                    Thanks for showing exactly what I have been asking to see! I finally have a chance to spend some time on this later tonight. I will let you know what I find. At least you can continue your flight to landing after pulling one circuit breaker. I know that's far from ideal, but I'm glad there is some solution that at least gives you the satisfaction of a smooth landing while I work on the problem.

                                    Did you try the BIOS change suggested above? Specifically enabling C-State Control? It would be interesting to see if that could change the outcome, now that we've collected some data.

                                    R 1 Reply Last reply
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                                    • Black SquareB Black Square

                                      Thanks for showing exactly what I have been asking to see! I finally have a chance to spend some time on this later tonight. I will let you know what I find. At least you can continue your flight to landing after pulling one circuit breaker. I know that's far from ideal, but I'm glad there is some solution that at least gives you the satisfaction of a smooth landing while I work on the problem.

                                      Did you try the BIOS change suggested above? Specifically enabling C-State Control? It would be interesting to see if that could change the outcome, now that we've collected some data.

                                      R Offline
                                      R Offline
                                      rafgath
                                      wrote last edited by rafgath
                                      #23

                                      @Black-Square Yes, I enabled C-State Control, but it's still the same. At least I can continue the flight by turning the circuit breaker off and on 🙂 . Thanks for looking into the issue.

                                      edit: I discovered something new — even if I turn off ND No. 1 and turn it back on, the FPS starts dropping again after a few dozen seconds. So I have to turn off the breaker again, but once I turn it back on, the FPS drops again after several dozen seconds. Unfortunately, I don’t have a recording of it because something went wrong and it didn’t record. 😞

                                      I also discovered that the FPS starts dropping for the first time between 55 -60 minutes of flight.

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                                      • MD82M Offline
                                        MD82M Offline
                                        MD82
                                        wrote last edited by
                                        #24

                                        For me, enabling C-State was like Gandalf tapping my PC with his cane. AB SO LUTE night and day. Thank you for this suggestion. I was going crazy with the cruise stutters with all hardware loads under 70%. ❤

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                                        • toby23T Offline
                                          toby23T Offline
                                          toby23
                                          wrote last edited by
                                          #25

                                          I have no idea if this is related as I have a 5800x 3d without C State but on tonight's flight on landing, the fps dropped to 10fps and this has never happened before. It could just be the sim, the servers etc but thought I would add here as it was in the Starship.

                                          Ryzen 5800X3D, 64GB RAM, RTX 4090, Windows 11

                                          Black SquareB 1 Reply Last reply
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