Below are tools you can use to check the performance of your website.
Google Mobile-Friendly Test
Test how easily a visitor can use your page on a mobile device. Just enter a page URL to see how your page scores. Why mobile? The web is being accessed more and more on mobile devices. Designing your websites to be mobile friendly ensures that your pages perform well on all devices.
Nobody Likes a Slow Website – Pingdom Website Speed Test was built to help you analyze the load speed of your websites and learn how to make them faster. It lets you identify what about a web page is fast, slow, too big, what best practices you’re not following, and so on. Pingdom has tried to make it useful both to experts and novices alike.