Need Suggestion for making PHP CURL efficient - php

Question

I have a http webapi. Which url is example.com/api
i want to send 50 post request to it at once. Right now I'm using multi curl to send request. Here is the code i'm using now:
$n = "0";
while ($n < 51) {
$data[$n] = [
'parameter1' => "value1",
'parameter2' => "value2",
];
$urls[$n] = "https://example.com/api";
$n++;
}
if (!empty($urls)) {
//create the array of cURL handles and add to a multi_curl
$mh = curl_multi_init();
foreach ($urls as $key => $url) {
$chs[$key] = curl_init($url);
curl_setopt($chs[$key], CURLOPT_ENCODING, '');
curl_setopt($chs[$key], CURLOPT_CONNECTTIMEOUT, 2);
curl_setopt($chs[$key], CURLOPT_TIMEOUT, 90);
curl_setopt($chs[$key], CURLOPT_SSL_VERIFYHOST, 0);
curl_setopt($chs[$key], CURLOPT_SSL_VERIFYPEER, 0);
curl_setopt($chs[$key], CURLOPT_RETURNTRANSFER, true);
curl_setopt($chs[$key], CURLOPT_POST, true);
curl_setopt($chs[$key], CURLOPT_POSTFIELDS, http_build_query($data[$key]));
curl_multi_add_handle($mh, $chs[$key]);
}
//running the requests
$running = null;
do {
curl_multi_exec($mh, $running);
} while ($running);
//getting the responses
foreach(array_keys($chs) as $key){
$error = curl_error($chs[$key]);
echo $result = curl_multi_getcontent($chs[$key]);
}
This code work perfectly. But I want to know if there is any other better way or is there anything i can do to make it more efficient and fast. in my case the api url is fixed but post content is different. Should i use single curl by making loop and reuse handle? My main concern is speed.
Thanks in advance.