如何使用Greasemonkey加速ajax http请求？

hey guys well when am gonna take an appointment and send request to that server https://algeria.blsspainvisa.com/appointment.php its keep loading without giving me any answer any solutions to speed up that request to server to get the answer fast

// ==UserScript==
// @name        BLS FAST REQUEST
// @require      https://algeria.blsspainvisa.com/french/js/jquery-1.11.0.min.js
// @include      https://*.blsspainvisa.com/*/appointment.php
// @include      https://*.blsspainvisa.com/appointment.php
// @grant       GM_xmlhttpRequest
// @connect     blsspainvisa.com
// ==/UserScript==

GM_xmlhttpRequest ( {
    method:     'GET',
    url:        'https://Algeria.blsspainvisa.com/appointment.php',
    onload:     function (responseDetails) {

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