When we say someone is moving or performing like a streak, we usually mean that they are moving very quickly and efficiently. Some synonyms for this phrase include "like lightning," "swiftly," "nimbly," "with lightning speed," "at breakneck speed," "like a rocket," "with great agility," and "as fast as an arrow." All of these phrases convey the same sense of speed, fluidity, and efficiency that come with moving like a streak. They are often used to describe athletes, dancers, or performers who are able to move with incredible speed and precision, leaving onlookers impressed and inspired by their abilities.