There are a number of speed test tools available online each with its own advantages and disadvantages. Some of the most popular speed test tools are Google's PageSpeed Insights Pingdom's Website Speed Test GTmetrix and WebPageTest.org.

Google's PageSpeed Insights is a good choice for testing the speed of your website on mobile devices and desktop computers. The tool provides you with a score for each page along with specific recommendations on how to improve the page's speed.

Pingdom's Website Speed Test is another popular choice and it offers a more comprehensive report than PageSpeed Insights. In addition to a page speed score, Pingdom provides you with an overview of your page's loading time size and requests. GTmetrix is similar to Pingdom in terms of features and reports comprehensiveness.

WebPageTest.org is a free open-source tool that offers more advanced features than the other tools on this list.

There are a number of factors that contribute to website speed including file size server response time and code efficiency. While there are many ways to test website speed some of the most popular tools include Google's PageSpeed Insights Pingdom and GTmetrix.

Google's PageSpeed Insights is a free tool that analyzes a website's performance and provides recommendations for improvement. Pingdom is another popular choice offering both free and paid plans. GTmetrix is another widely used speed testing tool that provides detailed information on how to improve website performance.

There are a number of website speed test tools available online each with its own advantages and disadvantages. Some of the most popular website speed test tools include Google PageSpeed Insights Pingdom GTmetrix and WebPageTest.

Google PageSpeed Insights is a free tool that provides insights on how to improve the speed of your website. Pingdom is a paid tool that offers more comprehensive results including a grade for each page tested. GTmetrix is another paid tool that provides detailed information about the load time of your pages and what can be done to improve it. WebPageTest is a free open-source tool that allows you to test the speed of your pages from multiple locations around the world. Tools like Pingdom GTmetrix and Google's PageSpeed Insights scan your website and give you a detailed report on how well it is performing. 

While all of these tools are helpful they can also be confusing. To get the most out of them you need to understand what the numbers mean and how they relate to website speed.