Critical #Ĭritical extracts, minifies and inlines above-the-fold CSS and is available as npm module.
It requires analysis of the entire DOM to determine the styles that are applied to each element in the viewport. This is good news because doing this manually would be a tedious process. There are a number of great tools that can automatically determine the critical CSS for a page. Generally speaking, the more CSS a site has, the greater the possible impact of inlined CSS. The performance impact you can achieve with this technique depends on the type of your website. For most servers, 10 packets or approximately 14 KB is the maximum that can be transferred in the first roundtrip. In this process, the server starts the transfer with a small amount of data and if it reaches the client in perfect condition, doubles the amount in the next roundtrip. New TCP connections cannot immediately use the full available bandwidth between the client and the server, they all go through slow-start to avoid overloading the connection with more data than it can carry.
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