After each build, Visual Studio 2012 switches from the Solution Explorer to the Code Analysis tab, usually with the yellow \"No code analysis issues were detected.\" (Might
Just found very helpful blog post about your issue Temporarily disable the C# static code analysis for a whole VS instance.
Also I have found way to permanently disable Code Analysis for all VS 2012 instances: You need to add Windows environment variable with name "DevDivCodeAnalysisRunType" and value "Disabled" (all without quotes). There is helpful post about Windows environment variables How To Add/Edit Environment Variables in Windows 7.
Hope that helps.