If you are encountering lag and freezing with FLDIGI after upgrading to Bookworm, the issue may be with the Wayland display server native to that operating system.?
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Reverting to X11 may resolve the issue, and is extremely easy to accomplish through sudo raspi-config. Here is a website I found with simple instructions:
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https://pimylifeup.com/raspberry-pi-wayland-x11/
Drew, KG7YSX