What is input rate?

What is input rate? - Woman in White Long Sleeve Shirt Using Macbook Pro

I just noticed a number (was it always there?) in the HUD 'input rate' you can adjust with the square brackets keys. What is it, what does it do?

infinifactory

Pictures about "What is input rate?"

What is input rate? - Netflix on an Imac

What is input rate? - Silver Imac on White Table

What is input rate? - Person in White Long Sleeve Shirt Using Macbook Pro

Different input rate and output rate

Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

Images: cottonbro, cottonbro, cottonbro, cottonbro