Syntax: limit_rate rate; Default: limit_rate 0; Context: http, server, location, if in location
Limits the rate of response transmission to a client. The rate is specified in bytes per second. The zero value disables rate limiting. The limit is set per a request, and so if a client simultaneously opens two connections, the overall rate will be twice as much as the specified limit.
Rate limit can also be set in the $limit_rate variable. It may be useful in cases where rate should