.NET (Core and Framework)

using System.Diagnostics;


namespace cpu_performance
{
    internal class Class1
    {


        static void Main(string[] args)
        {

            PerformanceCounter cpuCounter;
            PerformanceCounter ramCounter;


            cpuCounter = new PerformanceCounter
            {
                CategoryName = "Processor",
                CounterName = "% Processor Time",
                InstanceName = "_Total"
            };
            cpuCounter = new PerformanceCounter("Processor", "% Processor Time", "_Total");
            ramCounter = new PerformanceCounter("Memory", "Available MBytes");

            Console.WriteLine("Computer CPU Utilization rate:" + cpuCounter.NextValue() + "%");
            Console.WriteLine("The computer can use memory:" + ramCounter.NextValue() + "MB");

            Console.WriteLine();

            while (true)
            {
                System.Threading.Thread.Sleep(1000);
                DateTime localDate = DateTime.Now;
                Console.WriteLine("Computer CPU Utilization rate:" + cpuCounter.NextValue() + " %");
                Console.WriteLine("The computer can use memory:" + ramCounter.NextValue() + "MB");
                Console.WriteLine("Local date and time: {0}, {1:G}", localDate.ToString(), localDate.Kind);
                Console.WriteLine();

                if ((int)cpuCounter.NextValue() > 80)
                {
                    System.Threading.Thread.Sleep(100 * 60);
                }


            }

        }


    }
}