Live from the SharePoint Conference 2012.
SharePoint 2013 performance challenges:
SharePoint 2013 responds to incoming request 50% faster, 4 x faster profile sync (10 x with Active Directory import), 40% more efficient use of bandwidth, 80% less I/O related SQL IOPS and more scalable farm.
This means for end users:
SharePoint 2013 has been optimized for wide-area networks.
Centralized and scalable cache for social features.
Request manager is sort of an intelligent software request management, meaning it detects if a server farm is less healthy and stop sending request (or is doing less request) to this server (remove the server of rotation); this way, letting the server finishing the jobs currently in progress and consuming the server resources.
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