No, time does not change speed. Time is a fundamental concept in physics and remains constant and consistent throughout the universe. It does not accelerate, decelerate, or vary its rate.

In some theories of physics, such as Einstein's theory of relativity, time can appear to pass at different rates for observers in different reference frames or under different gravitational conditions. This is not because time is actually changing speed, but rather due to the effects of relative motion and gravity on the perception and measurement of time.