But the important question here is: why is it not as good and efficient as running Linux natively?
Is it RAM? Because at some point that stops being a problem.
Is it 3D acceleration? That is not only fixable, but also most other "Linux native" mobile environments have the same problem.
Is it integration with the host operating system
or because you actually prefer it over the host environment? That's the only reason I currently have for preferring a native Linux environment, but even I myself admit I don't see this idea flying with many people.