What is the result of increased rotor efficiency in a helicopter?

Increased rotor efficiency in a helicopter primarily leads to improved lift capacity. When rotor efficiency is enhanced, it allows the blades to generate more lift for a given amount of rotor speed and engine power. This means that the helicopter can either lift more weight or achieve a higher altitude with the same load. Improved rotor design, material advancements, or optimized blade shapes can contribute significantly to this efficiency.

While options like translation lift, enhanced maneuverability, and decreased fuel consumption are important characteristics or benefits of helicopter performance, they aren't direct results of increased rotor efficiency alone. Improved lift is a fundamental benefit that directly correlates with rotor efficiency, making it the most appropriate answer in this context.