In povray.unoffical.patches, In early November I picked up a severe
performance issue with the preview feature and SDL2.0:
"Performance issue with preview and sdl2.0."
True, I guess, except the severity appears to be tangled in the fact the
Ubuntu 20.4.1 Gnome desktop is leaking memory over time. This leak
apparently a known issue for which I'm having to reboot Ubuntu about
every 10-12 days or so - lest I start to swap. :-(
I've not gotten any of the suggested gnome restart patches to work in
the sense of actually returning leaked memory. I don't understand enough
about the desktop to understand why or why not. Maybe it's not Gnome, or
just Gnome, leaking...
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