Assume that you use Microsoft SQL Server 2012 Analysis Services (SSAS 2012) or SSAS 2014 in Tabular model. When you perform a full process on the model multiple times, it takes more and more time to complete than the initial processing.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
Article ID: 2976861 - Last Review: Oct 21, 2014 - Revision: 1
Microsoft SQL Server 2012 Service Pack 2, Microsoft SQL Server 2012 Analysis Services