There’s no perfect way for testing browser performance, but PCWorld tested three ways to test browsers. The easiest way to test is to test on live Web pages and test how long it takes for each browser to load the pages in question. The other option is to save pages to another Web server software installed. Benchmarking is good for identifying how well browsers handle different Web technologies, but most aren’t real-world tests or only test a specific element of browsing performance. Your results will most definitely vary depending on your computer’s hardware.”]
Source: https://www.csoonline.com/article/2125715/lab-notes–the-inside-scoop-on-browser-speed-testing.html