What is a single word for power-to-weight ratio?

I am looking for a word that captures the spirit of power-to-weight ratio, but in a mostly non-technical sense.

The spirit I refer to is something like efficiency, productivity, bang-for-buck, or even return on investment, but also perhaps frugality and prudence.

Ideally there will be both noun and adjective forms.

The connotation should be unambiguously positive ("frugal" is too close to "penny-pinching"), and also intrinsically positive, so that additional qualifiers are not needed (for example, "efficiency" must be qualified as either "high efficiency" or "low efficiency").

"Efficiency" and "prudence" together come closest, but is there a single word capturing both?

Example usage in sentences:

• "The word of the new camera tripod makes it attractive for professional fieldwork"
• "Environmentally conscious consumers are increasingly demanding word products that minimize waste without compromising performance"

Solution 1:

I think 'lightweight' may be the best and most widely-understood word you could use. In some contexts, 'lightweight' can mean weaker - but in the context of something where being light is advantageous, it is in no way negative. For example, bicycles are described as "lightweight" if they are made out of light-but-strong metals or alloys.

If you wanted to make a compound adjective that clarified something is both light yet strong, you could perhaps use 'light-but-strong', or 'light-but-sturdy'. The latter would be particularly apt for a camera tripod, as 'sturdiness' would imply it remains standing.

• "The lightweight construction of the new camera tripod makes it attractive for professional fieldwork"
• "Environmentally conscious consumers are increasingly demanding light-but-sturdy products that minimize waste without compromising performance".

The Wikipedia entry for titanium uses the term "strength-to-weight ratio" and notes that this quality is due to its "low-density", but these are both reasonably technical terms that are unlikely to be used in everyday English, such as your examples.

Also, consider this example for reference as it is a general interest article which uses "strong and lightweight" and variations of it throughout. It would seem there is no better term, at least one widely known.