Assume that you use Microsoft SQL Server 2012 or SQL Server 2014 Master Data Services (MDS). When you try to access the Explorer or the System Administration functional area on the Master Data Manager (MDM) home page, the website responds slowly, and the CPU usage becomes high.
When you try to access the Explorer or the System Administration functional area, a call of a security evaluation stored procedure is done. The query optimizer selects a suboptimal plan and uses a nested loop instead of a hash match.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.