Lag when using 7" touch screen.

On Shabaz's advice I've started looking for audio problems alone that were like mine. Most of the threads/posts seem to be from 2013 or so. Like this one here. https://www.raspberrypi.org/forums/viewtopic.php?t=60353  Unfortunately the solution was to eliminate the component cable and only use HDMI.

This one from 2016 https://raspberrypi.stackexchange.com/questions/3626/how-to-get-better-audio-quality-from-audio-jack-output  has a work around using a USB audio device and some fixes here https://www.raspberrypi.org/forums/viewtopic.php?f=35&t=20445 from 2012.

Seems like this problem was fixed or should have been fixed. Newer posts having to do with audio have a lot of the same fixes , but for different problems. https://github.com/alexa-pi/AlexaPi/wiki/Audio-setup-&-debugging

After reading the negative reviews on Amazon it seems to me this screen should not be sold as an official Raspberry PI - plug and play.

Hi Will,

From the symptoms you described, it still seems like a RetroPie script or Raspbian image or sound driver issue.

I don't think it is anything to do with the display. The symptom likely has a different root cause basically, and the result is lag from the application itself (some of this is speculation - but it's a reasonable guess). You can test by trying to run an application that has no sound capability. If it runs with no lag (well, no lag compared to HDMI) then that's a strong indicator. Have you run such tests?

The display is a mature product (been available for several years) and is intended for kids to use to learn programming with the Pi.

Once you go beyond that and start loading up games emulators with sound capability, although it can work, I'm not overly surprised if it needs troubleshooting since whoever last updated the scripts or the drivers may not have tested that combination (display plus particular retropie script you're using).

As well as the test mentioned above, have you tried to disable audio capability in Retropie, as a temporary test to see if it resolves the lag from the application?

Hi Will,

From the symptoms you described, it still seems like a RetroPie script or Raspbian image or sound driver issue.

I don't think it is anything to do with the display. The symptom likely has a different root cause basically, and the result is lag from the application itself (some of this is speculation - but it's a reasonable guess). You can test by trying to run an application that has no sound capability. If it runs with no lag (well, no lag compared to HDMI) then that's a strong indicator. Have you run such tests?

The display is a mature product (been available for several years) and is intended for kids to use to learn programming with the Pi.

Once you go beyond that and start loading up games emulators with sound capability, although it can work, I'm not overly surprised if it needs troubleshooting since whoever last updated the scripts or the drivers may not have tested that combination (display plus particular retropie script you're using).

As well as the test mentioned above, have you tried to disable audio capability in Retropie, as a temporary test to see if it resolves the lag from the application?