A team of researchers in Portugal analyzed the energy, speed, and memory usage of 27 programming languages using 10 benchmark problems from the Computer Language Benchmarks Game. They found that while C was generally the fastest and most energy-efficient, results varied depending on the test and criteria. Compiled languages were typically more efficient than interpreted ones, but factors like compiler quality and libraries also impact power consumption. Overall, no single language emerged as consistently superior across all scenarios, emphasizing the importance of context in choosing a programming language based on energy efficiency.