"M2 takes the industry-leading performance per watt of M1 even further with an 18 percent faster CPU, a 35 percent more powerful GPU, and a 40 percent faster Neural Engine" 18% faster at the same performance per watt is a nice increase. Interesting to see if this will ever make it to their desktop computers.
18% faster at the same wattage, which means 18% higher perf/watt.