To be able to respond to the declared 8000 Hz, you will need powerful hardware, just like with a razer viper 8khz mouse; otherwise, on a weak one, you will slow down horribly, and the mouse with the keyboard will "turn" its actions after a couple of seconds. Alternatively, you can set the refresh rate to 1000 in the application (which is the standard), or you can use a mouse that supports 8 kilohertz.