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Front-end optimization (FEO) is the process of optimizing the delivery of website resources from the client side. In IT, there are two different areas where technology works: the client side, or front end, and the server side, or back end. FEO reduces the number of page resources needed to download a given page, allowing the browser to process the page more quickly. For many popular sites, front-end bottlenecks account for a large percentage of users' wait time. Best practices in FEO include methods such as resource consolidation, versioning, domain sharding, minification and use of compression. New technologies are also emerging that automatically optimize Web pages.
Front-end optimization may also be known and front-page optimization.
Part of understanding front-end optimization is to understand where the front end and back end are for any given tech system. In a Web service, the back end is where servers at the service provider’s locations handle user requests. The front end is where the user's browser downloads and presents code.