Hi David,

Is your astroberry running in wifi AP mode or client mode?

What VNC client are you using? Cheapest way is to go to 8 bit/256 color mode but your will lose dynamic range in any images viewed.
You can play with other settings also in the VNC client. The way I 'test' is to have a 'busy' background on the desktop then overlay another smaller window on top then grab the smaller window and move it around rapidly.

If you are running astroberry in wifi client mode, you can check your wifi link using utility 'wavemon'.

Gene

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