This audit fails when the browser waits more than 600 ms for the server to respond to the main document request. Users dislike when pages take a long time to load. Slow server response times are one possible cause for long page loads.
When users navigate to a URL in their web browser, the browser makes a network request to fetch that content. Your server receives the request and returns the page content.
The server may need to do a lot of work in order to return a page with all of the content that users want. For example, if users are looking at their order history, the server needs to fetch each user’s history from a database, and then insert that content into the page.
Optimizing the server to do work like this as quickly as possible is one way to reduce the time that users spend waiting for pages to load
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