---
c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
SPDX-License-Identifier: curl
Title: CURLOPT_MAX_SEND_SPEED_LARGE
Section: 3
Source: libcurl
See-also:
  - CURLOPT_LOW_SPEED_LIMIT (3)
  - CURLOPT_MAX_RECV_SPEED_LARGE (3)
Protocol:
  - All
---

# NAME

CURLOPT_MAX_SEND_SPEED_LARGE - rate limit data upload speed

# SYNOPSIS

~~~c
#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_MAX_SEND_SPEED_LARGE,
                          curl_off_t maxspeed);
~~~

# DESCRIPTION

Pass a curl_off_t as parameter with the *maxspeed*. If an upload exceeds
this speed (counted in bytes per second) the transfer pauses to keep the
average speed less than or equal to the parameter value. Defaults to unlimited
speed.

This is not an exact science. libcurl attempts to keep the average speed below
the given threshold over a period time.

If you set *maxspeed* to a value lower than
CURLOPT_UPLOAD_BUFFERSIZE(3), libcurl might "shoot over" the limit on
its first send and still send off a full buffer.

This option does not affect transfer speeds done with FILE:// URLs.

# DEFAULT

0, disabled

# EXAMPLE

~~~c
int main(void)
{
  CURL *curl = curl_easy_init();
  if(curl) {
    CURLcode ret;
    curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
    /* cap the upload speed to 1000 bytes/sec */
    curl_easy_setopt(curl, CURLOPT_MAX_SEND_SPEED_LARGE, (curl_off_t)1000);
    /* (set some upload options as well!) */
    ret = curl_easy_perform(curl);
  }
}
~~~

# AVAILABILITY

Added in 7.15.5

# RETURN VALUE

Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
