About

The Refresh Rate ¹⁾ is the number of times in a second that a display refresh the screen by redrawing the content of its buffer.

Most devices today refresh their screens 60 times a second (60 Hz). An application must then put a new image every 10 ms

<MATH> \text{Refresh Rate} \approx 10 ms \approx \frac{1}{60} - \text{overhead} </MATH>

Implication

• If a video application can not put up 1 new picture, or frame in the buffer because of performance before each screen refreshes,
• the frame rate drops (frame are not shown),
• the content judders on screen (often referred to as jank)