Time to first byte (TTFB) is the measurement of the responsiveness of a web server.
You can both test the speed of your server and measure your CDN performance.
Verifying that your CDN is loading the correct assets quicklyīefore 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. Utilizing different browsers to ensure that load times and user experience is similar across all. Checking load speeds using servers in various countries. Analyzing total load times, page sizes, and request count. Detecting render-blocking JavaScript/CSS. Determining whether certain images need to be compressed. Verifying all scripts on your site are minified. Pinpointing which site assets are causing slow load times. Here are just a few of the common ways websites speed test tools are used: What can a website speed test help you analyze? Google's ranking algorithm wants your site to load in less than a second. You can take advantage of the many free website speed test tools available out there to achieve optimal performance. As discussed in our content delivery network 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. 
The speed of a website is critical to its success.
Website speed test with Chrome extensions. What can a website speed test help you analyze?.
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