How to reduce the memory usage of my app in C#

Question

I'm building a small program that checks if the resource monitor is open and if so, closes it.

bool a = true;
while (a == true)
{
    foreach (var p in Process.GetProcessesByName("perfmon"))
    {
        Process.Start("taskkill", "/F /IM perfmon.exe");

        // "perfmon" "Taskmgr"
        foreach (var t in Process.GetProcessesByName("taskkill"))
        { 
             ... 
        }
    }
}

The problem is that it takes almost 30% of my CPU performance, so how can I reduce the CPU usage?

Also I tried to add other program like tasklist and task manager but it didn't worked, do you have an idea? :

bool a = true;
            while (a == true)
            {
                System.Threading.Thread.Sleep(1000);
                foreach (var p in Process.GetProcessesByName("Taskmgr"))
                {
                    Process.Start("taskkill", "/F /IM Taskmgr.exe");

                    // "perfmon" "Taskmgr"
                    foreach (var t in Process.GetProcessesByName("taskkill"))

                    {
                        System.Threading.Thread.Sleep(60000);

                        Process b = Process.Start("");
                    }
                }

                foreach (var p1 in Process.GetProcessesByName("perfmon"))
                {
                    foreach (var t1 in Process.GetProcessesByName("taskkill"))

                    {
                        System.Threading.Thread.Sleep(60000);

                        Process b1 = Process.Start("");
                    }

                }

                foreach (var p2 in Process.GetProcessesByName("tasklist"))
                {
                    foreach (var t2 in Process.GetProcessesByName("taskkill"))

                    {
                        System.Threading.Thread.Sleep(60000);

                        Process b2 = Process.Start("");
}
}

Answer 1

Put a Sleep() in your while-loop:

System.Threading.Thread.Sleep(1000);

Your program is constantly checking all processes on your PC. If it does so, only once every second, that's more than enough.