Performance whey protein is a fast-absorbing protein powder, often a blend of whey isolate and hydrolysate, designed to maximize muscle recovery, growth, and energy for athletes by delivering quality protein quickly, sometimes enhanced with digestive enzymes for better absorption, making it ideal post-workout for repairing and building lean muscle. Brands like Optimum Nutrition, MuscleBlaze, and ESN offer these products, emphasizing high protein content, low fat/sugar, BCAAs, and certifications for purity.