Some updated observations: 12 hours in
- First note we need to use a high-quality SD card. I had an old SD card with no markings on it other than brand and size (scandisk 16gb), and the system response was slow when I switched to a newer one I got better response times. My thinking is part of the problem is storage IO.
- Another thing I saw on both zeros is the swap space is almost always full. I wonder if this is causing storage IO problems. I was going to try to remove it and see how things work.
- zero w touch screen response is about 1 sec
- zero 2 w touch screen response is unreliable times very fast, and sometimes it will take many sec to respond (both are using the same pi touch screen)