When you add a website to the system, in order not to cause a burst of traffic, there is a parameter 'Rate'. This parameter limits the number of new users coming to the site every day. 'Rate' can be understood as a parameter, which increases traffic of website at no more than 'Rate' of new users per day. If, for example, "Rate" = 100, then the first day website traffic is equal 100, the second - 200, etc. until it reaches the maximum number of hosts.