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FAQ 168: Microsoft .NET optimization high CPUCategory: Everything else
You may notice ngen.exe or mscorsvw.exe running and taking up allot of CPU, this is normal especially after installing .NET Framework for the first time or a .NET update.
However, on some systems this may prevent DNS Redirector from running or starting fully, until the optimization service completes.
For more information about these Microsoft executables, including how you can speed up the process, see here.
FAQ 108 Microsoft .NET Framework is required