// Set at beginning:
using System.Diagnostics;
using System.Collections.Generic;

// --------------

Process p = new Process();
p.StartInfo.UseShellExecute = false;
p.StartInfo.CreateNoWindow = true;
p.StartInfo.RedirectStandardOutput = true;
p.StartInfo.WindowStyle = ProcessWindowStyle.Hidden;
p.StartInfo.FileName = "wmic";
p.StartInfo.Arguments = "cpu get loadpercentage";

string salida = "";
string[] separator = new string[] {"\n"};
string[] output;

p.Start();
salida = p.StandardOutput.ReadToEnd();
p.WaitForExit();

output = salida.Split(separator, StringSplitOptions.None);
string carga = output[1].Trim(); // LoadPercentage -> numero

BFS.Speech.TextToSpeech(carga + " percent");