Tools like Qt+QML are, in my experience, just as efficient in terms of development time, but much more computationally and memory efficient than a typical elect

Tools like Qt+QML are, in my experience, just as efficient in terms of development time, but much more computationally and memory efficient than a typical electron application. I'm not saying that you can't make electron run efficiently, just that it takes more work and therefore since most teams optimise for development rather than computation, the end result is that electron is (again in my personal experience) typically less computationally/memory efficient. It also helps that in QML javascript is typically used only as non-performance-critical glue code and the rest (and the framework itself) is in C++ and the GUI rendering is in OpenGL.