Which of the following terms is synonymous with "very, very fast"?

The term "prestissimo" is used in music to indicate a tempo that is extremely fast, even more so than "presto," which already suggests a rapid pace. "Prestissimo" typically denotes a speed that is faster than 168 beats per minute, making it the most appropriate choice for describing something that is "very, very fast." The distinction comes from Italian musical terminology, where "pressto" signifies fast, and adding "issimo," a superlative suffix, amplifies that meaning to the highest degree. In comparison, "vivace" and "allegro" suggest lively or fast tempos, but they do not reach the extreme speed that "prestissimo" conveys.