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    Please do not post a support request without first reading and following the advice in https://retropie.org.uk/forum/topic/3/read-this-first

    Pi Zero poor emulation performance & stutter

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    pi zero stutter
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    • G
      Gerry69
      last edited by

      Hey all retro-lovers out there,

      I kindly ask for your help because no posts in this forum or other searches on the internet helped me.

      I have a Pi Zero W with Retropie setup on a fast SD card (SanDisk Ultra) and powered by USB-A.
      What I want is emulation of Sega Master, Sega Mega, C64 and z-code (Infocom adventures, maybe some Commodore Amiga. Z-code is the ONLY thing that runs without problems. All other emulations stutter in sound and speed. I'm surprised to read that even on a Pi Zero 8- and 16-bit emulations should run smoothly.

      Can this be an issue of the power supply? I read the Zero should draw around 150 mA, and my USB-keyboard around 100 mA (nothing else connected), so the 500 mA of the USB port should be sufficient - is that correct? I also used a 5V powerbank and a strong 5V power adapter, which didn't solve the problem.

      My second thought was about heat, as I bought a very basic case which is actually just a plastic cover above the board, but it doesn't feel warm at all.

      I have tried different sound and video drivers and different emulators - all with the same result. Maybe the vram-setting has to be adjusted?

      I'm really desperate and disappointed by the whole experience and effort so far, so every help is really appreciated! Thanks in advance.

      retropieuser555R Lister of SmegL dankcushionsD G 5 Replies Last reply Reply Quote 0
      • retropieuser555R
        retropieuser555 @Gerry69
        last edited by

        @gerry69 you can tell if it's a power issue as you'll get a lighting bolt in the corner of the screen. It does sound odd though, I use a pi zero w with a retroflag GPI and it is comfortably able to run SNES (on pisnes) and megadrive/Sega cd with no issues. Is Emulationstation choppy as well? Or just the retroarch emulators?

        Pi 5 4GB

        Retroflag GPI with raspberry pi zero 2 w/ wifi

        Retroachievements:- lovelessrapture

        G 1 Reply Last reply Reply Quote 1
        • G
          Gerry69 @retropieuser555
          last edited by

          @retropieuser555 Thanks for your reply! No, I don't have any lightning bolt symbol as far as I can see - should that be visible on boot screen or emulation? Emulationstation runs absolutely smoothly, only the emulators stutter. Some SMS games run okay, but never without issues. Mega Drive and C64 are unusable. Do you have any suggestion for optimal vram setting? Thanks again!

          1 Reply Last reply Reply Quote 0
          • Lister of SmegL
            Lister of Smeg @Gerry69
            last edited by Lister of Smeg

            @gerry69 maybe you've already tried this but sometimes it's worth lowering the screen resolution in RasPi-Config for a performance boost

            G 1 Reply Last reply Reply Quote 1
            • G
              Gerry69 @Lister of Smeg
              last edited by

              @lister-of-smeg Thanks, I tried it but it didn't change anything - not even a bit. Did even a complete reinstall on a different SD card. Didn't help. Maybe I should try a hammer ;)

              Lister of SmegL 1 Reply Last reply Reply Quote 0
              • Lister of SmegL
                Lister of Smeg @Gerry69
                last edited by

                @gerry69 very odd?
                a clean install and changing the default emulator to lr-picodrive should give good results with master/mega games
                your case shouldn't affect anything but it's easy to eliminate - just take the pi out (static can cause weirdness but i've never seen it with a pi)

                G 1 Reply Last reply Reply Quote 0
                • dankcushionsD
                  dankcushions Global Moderator @Gerry69
                  last edited by

                  @gerry69 said in Pi Zero poor emulation performance & stutter:

                  I have tried different sound and video drivers and different emulators - all with the same result

                  the default are optimal.

                  Maybe the vram-setting has to be adjusted?

                  the vram setting in emulationstation is nothing to do with emulation, only emulationstation. the memory split documentation is here: https://retropie.org.uk/docs/Memory-Split/ (on an official retropie image it doesn't need adjusting)

                  to fully diagnose issues please provide all the information requested here, including verbose log of (say) badly performing megadrive game: https://retropie.org.uk/forum/topic/3/read-this-first

                  G 1 Reply Last reply Reply Quote 1
                  • G
                    Gerry69 @Lister of Smeg
                    last edited by

                    @lister-of-smeg Tjanks, I'll check that to exclude static problems.

                    1 Reply Last reply Reply Quote 0
                    • G
                      Gerry69 @dankcushions
                      last edited by

                      @dankcushions Thank you for your reply and for reassuring me that the default drivers are not the problem and that the shared RAM needn't be shifted in either direction - was worried that 512 MB might be a bit short.
                      I will try to post the verbose log later this day. Thanks again for your help!

                      1 Reply Last reply Reply Quote 1
                      • G
                        Gerry69 @Gerry69
                        last edited by

                        @gerry69 Just did a 3rd fresh reinstall and to my surprise Seg Mega worked quite well -with very little stuttering. BUT after I ran the setup - keyboard language, filesystem expand, WiFi, updates, additional emulators - the heavy stuttering was back. Turning off WiFi and BT doesn't help. I don't understand this. So the only solution is probably go with another fresh install, although that means no z-code adventure games and no C64, which is shit. :(

                        retropieuser555R dankcushionsD 2 Replies Last reply Reply Quote 0
                        • retropieuser555R
                          retropieuser555 @Gerry69
                          last edited by

                          @gerry69 Is your keyboard Bluetooth by any chance? I wonder if that's causing the slowdown

                          Pi 5 4GB

                          Retroflag GPI with raspberry pi zero 2 w/ wifi

                          Retroachievements:- lovelessrapture

                          G 1 Reply Last reply Reply Quote 0
                          • dankcushionsD
                            dankcushions Global Moderator @Gerry69
                            last edited by

                            @gerry69 again, without a verbose log we'd be guessing. please supply one.

                            1 Reply Last reply Reply Quote 1
                            • G
                              Gerry69 @retropieuser555
                              last edited by

                              @retropieuser555 no, it's USB

                              1 Reply Last reply Reply Quote 0
                              • G
                                Gerry69 @Gerry69
                                last edited by

                                @gerry69 Conclusion:

                                I thank you all for trying to help me!

                                As I was about to reinstall again (!) I discovered Recalbox as an alternative distro and thought I'd give it a try (forgive me). While on Retropie Vice refused to install, and lr-Vice had to be compiled 3 hours for stuttering results and Sega Mega Drive was unplayable with both emulators, in Recalbox EVERYTHING works perfectly smooth without even the need of setting up or installing anything.

                                So I hope you all understand that at this point - after at least 20 hours of trying to get Retropie going - I give up and go happily with Recalbox.

                                Thanks again anyway - cheers!

                                1 Reply Last reply Reply Quote 0
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