The links on the other websites are called external link.You should not have too much external links on your website.
Domain is either you or your company's ID in the Internet, when you apply to connect to Internet, they will give you protocol number. Every device connected to Internet has an IP number.
It is highly recommended that all Java Script files should be compressed and minified as it can save up to 118.4 k B or 71% of the original size.
CSS files minification is very important to reduce a web page rendering time.
Information : Page Speed is the speed at which your site responds to commands input.
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