HTML5 gives you an easy way to "defer" JavaScript code. In general, you should put your JavaScript in a separate file from the rest of your site. Here is a great tutorial on how to properly defer JavaScript loading. Google recommends removing or deferring JavaScript that interferes with loading the above the fold content of your webpages. Render-blocking refers to JavaScript and CSS that are keeping your page from loading as quickly as it could. Read more about time to first byte and time to last byte. By using a CDN you can dramatically reduce the impact of the load on your origin server, which in turn should help decrease your TTFB. Basically it is the time it takes your browser to start receiving information after it has requested it from the server. 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.
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