Wordpress插件 - 发布帖子很慢

I created a wordpress plugin in which on post publish I will call a function which will send a post request to my server with blog post ID,post head and URL.

Everything is working fine,but the 'publish_post' is very slow,as it waits for server response.I'm using PHP curl method for server connection.

I even tried

curl_setopt($ch, CURLOPT_TIMEOUT_MS, 0.1);

But doesn't make any change in response delay.

function on_post_publish( $ID) {

    $subject=get_the_title( $ID );

    $url= get_permalink( $ID )

    send_data_to_server($subject,$url,$ID);
}
add_filter(  'publish_post',  'on_post_publish', 10, 2 );    

function send_data_to_server($subject,$client_url,$ID){


    $url = "http://....../plugin.php"; 

    $data="subject=".$subject."&url=".$client_url."&post_id=".$ID;

    $curl = curl_init();
    curl_setopt($curl, CURLOPT_URL,$url);
    curl_setopt($curl, CURLOPT_POST, 1);
    curl_setopt($curl, CURLOPT_POSTFIELDS,
            $data);
    curl_setopt($curl, CURLOPT_HTTPHEADER,
            array("Content-type: application/x-www-form-urlencoded"));
    curl_setopt($ch, CURLOPT_FRESH_CONNECT, true);
    curl_setopt($ch, CURLOPT_TIMEOUT_MS, 0.1);

        $json_response = curl_exec($curl);

    curl_close($curl);

}