What Is Unity's Time.deltaTime and Why Every Game Developer Should Use It

Unity's Time.deltaTime represents the time elapsed in seconds between the previous frame and the current one. Without it, game objects move faster on high-performance machines and slower on weaker ones, creating unfair or inconsistent gameplay. By multiplying movement values by Time.deltaTime, developers ensure that objects travel the same distance per second regardless of a device's frame rate. Unity calculates the value by subtracting the timestamp of the last frame from that of the current frame, then passes it into the Update() method each cycle. A simple code example demonstrates how multiplying input and speed by Time.deltaTime keeps character movement consistent across all hardware.