They assist in the following ways: Run the Google Test My Site tool to get a reality check on your site’s performance. Google is so dedicated to this that it provides an analysis of mobile-friendliness and mobile page speed. Learn about file sizes, screen sizes, and JS compression. Run the Google PageSpeed Insights tool to find specific optimization facets that are listed in priority order both for mobile and desktop versions of your website. GT Metrics even provides a graph showing how much time it takes to load each file that a page calls for. Pingdom has a free version that anyone can use because it deems site load performance as important as uptime. The Apache JMeter application was designed to load test functional behavior and measure performance. It was originally intended for testing Web Applications but has now expanded to additional and vital test functions.