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> Probably the last place I'd expect that memory-hungry and CPU-inefficient UI to appear.

In a prototype with batteries large enough to heat and power a house for weeks?

The power consumption of the navigation electronics is probably not a big concern.

I would have put linux and a fullscreen electron app on those screens.

I didn't read their comment as "drains the battery", more like "slows your computer down and eventually freezes". That could still be fine if you anticipate it (and as you said, it's a prototype) and the control system (throttle, rudder) doesn't depend on it.

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