Switch off the progress meter
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_NOPROGRESS, long onoff);
If onoff is to 1, it tells the library to shut off the progress meter completely for requests done with this handle. It will also prevent the CURLOPT_PROGRESSFUNCTION(3) from getting called.
Future versions of libcurl are likely to not have any built-in progress meter at all.
1, meaning it normally runs without a progress meter.