You can limit the account's total bandwidth in your server's WHM on the WHM >> Home >> Account Functions >> Limit Bandwidth Usage page. You can read about the Limit Bandwidth Usage function here: https://documentation.cpanel.net/display/72Docs/Limit+Bandwidth+Usage Note that this function does not provide a mechanism for rate-limiting bandwidth or for connections to a site. You may therefore wish to investigate a custom mod_security configuration, such as the one outlined here: https://johnleach.co.uk/words/2012/05/15/rate-limiting-with-apache-and-mod-security/ Alternatively, you may wish to install a third-party firewall such as CSF/LFD, which may have more granular rate-limiting functionality. You can read about CSF/LFD here: https://www.configserver.com/cp/csf.html