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Okay I hope you still readind replies so here is that: wanted to reply directly to topic starter since it's most relevant. Some might be taken my posts here like I hate Qt or something, but I really like Qt.

I don't see any issues with implementing your idea using Qt and it's will absolutely certainly be using less CPU and RAM without any optimizations.

Yet IMHO there is good chance that if you stumble into some Qt / CMake / C++ issue then you gonna be wasting ten times more time on initial implementation. This is C++ for you. And this might kill your project before you even get to first stable version.