可以测试指定国家指定设备访问网站的加载时间，很适合外贸，如果你的站点主要针对某个区域的，那么这个工具就很有用。

Google官方提供的网站测速优化指导网站。

Use this free Website Speed Test to analyze the load speed of your websites, and learn how to make them faster.

GTmetrix is a free tool to test and monitor your page's performance. Using Lighthouse, GTmetrix generates scores for your pages and offers actionable recommendations on how to optimize them.