response.sendRedirect is a method in Java that is used to redirect a client request to a different URL. The speed at which the redirection occurs depends on various factors such as the network speed, server load, and the size of the response being redirected.

In general, response.sendRedirect is a fast and efficient way to redirect a client request as it simply sends a response with a new location header to the client, which then initiates a new request to the specified URL. However, it is important to note that the speed of the redirection can vary depending on the factors mentioned above.

Overall, response.sendRedirect is a commonly used method for redirection and is considered to be a fast and reliable way to redirect client requests.