// ==UserScript==
// @name         网页加载速度测试
// @author       ChatGPT
// @version      2.0
// @description 测试网页加载速度
// @match        *://*/*
// @run-at      document-start
// @grant        none
// @namespace https://greasyfork.org/users/452911
// @downloadURL none
// ==/UserScript==

(function() {
  const startTime = performance.now();
  
  window.addEventListener('load', () => {
    const endTime = performance.now();
    const timeElapsed = endTime - startTime;
    
    alert(`网页加载总计耗时 ${timeElapsed.toFixed(2)} 毫秒`);
  });
})();