Here I am going to give an introduction on new service in SharePoint Server 2013 Preview called the Distributed Cache service.

 The Distributed Cache service provides caching functionality to features, in SharePoint Server 2013. The Distributed Cache service is either required by or improves performance of the following features:
• Authentication
• Newsfeeds
• OneNote client access
• Security Trimming
• Page load performance
For an overview of the Distributed Cache service, see http://technet.microsoft.com/library/jj219700(office.15).aspx.
When you plan a deployment of SharePoint Server 2013 Preview, planning for the Distributed Cache service is important. Consider the following items when planning your deployment:
• Consider using a dedicated Distributed Cache server when you use the newsfeed and microblog features.
• Decide if your SharePoint Server 2013 Preview deployment requires a single cache host or a cache cluster.
• An administrator can allocate memory to the Distributed Cache. This allocation significantly affects the performance of the Distributed Cache service.