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imgui is great, but I have a bit of an allergy on C++. There's Nuklear https://github.com/vurtun/nuklear which is a re-take on it, but in ANSI C. It's interesting to see GUI rendering takes so much of your processing time slot, or is it that everything else is so little?

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GUI is slow primarily because of naive uploading of six video frames sixty times per second. Not a detail that mattered for this initial work. It should take almost no time with a smarter implementation.

Ah, so you're counting video upload to texture and render of it as part of GUI cycle? Number makes sense then. You're basicaly redrawing whole gui each frame along with video texture and uploading/updating that texture at 60fps.

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