---
name: "CURLOPT_MAX_SEND_SPEED_LARGE"
section: "3"
platform: "macos"
package: "curl"
version: "166.0.0.0.1"
release: "macOS 26.5"
platforms: ["linux", "macos"]
url: "https://new.carta.tech/CURLOPT_MAX_SEND_SPEED_LARGE"
---

# CURLOPT\_MAX\_SEND\_SPEED\_LARGE(3)

rate limit data upload speed

## NAME

CURLOPT\_MAX\_SEND\_SPEED\_LARGE - rate limit data upload speed

## SYNOPSIS

```
#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)](/CURLOPT_UPLOAD_BUFFERSIZE/3.md)*, 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

## PROTOCOLS

All except file://

## EXAMPLE

```
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.

## SEE ALSO

[**CURLOPT\_LOW\_SPEED\_LIMIT**(3)](/CURLOPT_LOW_SPEED_LIMIT/3.md), [**CURLOPT\_MAX\_RECV\_SPEED\_LARGE**(3)](/CURLOPT_MAX_RECV_SPEED_LARGE/3.md)