Object cache is the third caching option we have for SharePoint 2010. What Object cache does is stores metadata about SharePoint Server objects (like SPWeb, SPSite, SPList, etc.) on the WFEs. When a page is rendered, if there is data that needs to be retrieved through these objects, the SQL Server will not be hit. Features of SharePoint that uses Object cache are publishing, content query web part, navigation, search query box and metadata navigation. These features are specifically written to use the Object cache API instead of the SharePoint API directly. Developers writing custom functionality can also tap into the Object cache API.

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