I'm not sure if this is what you want but it retreive the load percentage for each processor:
Code:
alias procload {
  .comopen p WbemScripting.SWbemLocator
  noop $com(p,ConnectServer,3,dispatch* d)
  noop $com(d,ExecQuery,3,bstr*,select * from Win32_Processor,dispatch* r)
  var %a 1
  while ($comval(r,%a,Name)) var %r = $addtok(%r,$+($chr(32),Load percentage for $v1,: $comval(r,%a,LoadPercentage),%),44),%a = %a + 1
  :error
  if ($com(p)) .comclose p
  if ($com(d)) .comclose d
  if ($com(r)) .comclose r
  return %r
}
Use for example //echo -a $procload, and note that it freezes mirc for a few ms so don't call it too often



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