When you want to limit the download speed to preserve resources for other tasks. You can limit the download speed by using the --limit-rate option followed by the maximum speed allowed in kiloBits per second and the letter k.

Download the favicon of vpsname.com with a speed of 15 kB/S.

wget --limit-rate 1k https://vpsname.com/favicon.ico

This is useful when you don't want Wget to consume the entire available bandwidth.