It happens when SQL Server debugging is enabled for the project. When you uncheck this option, Lsass.exe does not take cpu. The SQL Server process does as expected. Performance is what you would expect in debug mode.
Moral of the story is do not leave SQL Server Debugging enabled in your project. Only enable it when necessary and then understand that performance will be extremely poor.
For more details, visit: http://forums.microsoft.com/MSDN/ShowPost.aspx?Pos...

本文探讨了在项目中启用SQL Server调试时遇到的性能问题。当此选项被启用时,Lsass.exe会占用大量CPU资源,导致整体性能显著下降。建议仅在必要时开启调试,并了解其对性能的影响。
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