https://pride11.com/assets/slow-loader.js

1(function () {
2  var timeout = setTimeout(function () {
3    var el = document.getElementById('preboot-loader');
4    if (!el) {
5      el = document.createElement('div');
6      el.id = 'preboot-loader';
7      el.innerHTML =
8        '<div class="spinner"></div>' +
9        '<div id="slow-message">Your internet connection seems slow...</div>';
10      
11      document.body.appendChild(el);
12      el.style.display = 'flex';
13    }
14  }, 15000);
15
16  window.markAppAsLoaded = function () {
17    clearTimeout(timeout);
18    var el = document.getElementById('preboot-loader');
19    if (el && el.parentNode) el.parentNode.removeChild(el);
20  };
21})();