I've built a Raspberry Pi to (hopefully) replace my old Windows
laptop. There were no technical issues in getting it running with
OpenCPN 5.2.4. It's a 8Gb 4B and a 64Gb Sandisk "Extreme" SD card. I'm currently plugged in to my
desktop monitor running at 1920 x 1080; I'll probably use a 14" "portable"
monitor running at the same resolution on the
boat.
I've loaded the US RNCs and ENCs (and a few other free RNCs).
So far, the graphics performance with vector
charts is VERY slow. As an example, a
single click on the "+" icon to zoom in takes 3 - 4 seconds. This is linear; if I click twice it's 7 - 8 seconds. Dragging a chart is equally painful, with the added caveat that the wait cursor isn't visible while the
screen repaints, so it's hard to tell if the action is complete.
I'm convinced that there must be something in my setup that's the problem, but so far I haven't found it. I did try tweaking gpu_mem in /boot/config.txt with no noticeable change.
Any suggestions on how to improve this performance?
Thanks!
Dan