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Openplotter Charts slow on Raspberry Pi 4
I am new to using Raspberry pi 4 and OpenPlotter. I have looked at Open CPN on my laptop and the speed of the graphics are good, - scrolling, zoom etc But now I want to use a Raspberry Pi 4 and Open Plotter on my boat and am experimenting with it but find the Charts to be VERY slow. 
Am I doing something wrong?
I am using the NOAA ENC charts to test with and have loaded their Lake Ontario charts.

Any suggestions please.
Try using raspi-config and increasing video memory to 384mb (assuming you are using an RPI4 with more than 2GB). Also, have a look at Chart Groups in OpenCPN. It allows you to quickly switch in and out chart sets, so you aren't loading the entire set of US ENCs.
Thanks abarrow.
I did try your suggestions, and am using them but what I found made the most improvement with graphic speed was in Advanced Options, I enabled the Accelerated Graphics (OpenGL)


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