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Munin Top 15 Free Website Speed Test Tools of 2017 The speed of a website can be a critical factor to its success. As discussed in our Content Delivery Network: A Beginners’ Guide, faster loading websites can benefit from higher SEO rankings, higher conversion rates, lower bounce rates, longer visitor duration on site, better overall user experience, and engagement. That is why it is important to take advantage of the many free website speed test tools available out there so you can achieve optimal performance . Google Wants Your Site to Load in Less Than a Second What Can a Website Speed Test Help You Analyze? Here are just a few of the common ways websites speed test tools are used: Website Speed Concepts Before running a website speed test it is important to understand a few concepts behind how these tools work so that you can better analyze the data and then optimize your site accordingly. Time to First Byte (TTFB) Time to first byte (TTFB) is the measurement of the responsiveness of a web server. Render-Blocking Javascript & CSS 1. 2.