.NET runtime optimization service is a component of the Windows Operating System, which is also known as mscorsvw.exe and used to optimize the system by helping it start apps and programs faster. But if you are experiencing long delays or slow processes, you will see high CPU usage in the task manager. Once you have ...NET runtime optimization service high CPU drain the system resources and occurs when you update the Windows to the latest version. It is also known as mscorsvw.exe and used to optimize the system