Fastest way of getting FTDI USB Serial Port Number

Question

I have a device using USB Serialport and, during the form load, I get the port number using below code. Actually, I googled and modified it.

ManagementClass processClass = new ManagementClass("Win32_PnPEntity");
ManagementObjectCollection Ports = processClass.GetInstances();

List<string> FTDIPorts = new List<string>();
int i = 0;
foreach (ManagementObject property in Ports)
{
   string name = (string)property.GetPropertyValue("Name");
   var manu = property.GetPropertyValue("Manufacturer");
   if (name != null && name.ToString().Contains("USB") && name.ToString().Contains("COM") && Manu.ToString() == "FTDI")
     {
        FTDIPorts.Add(name.Substring(name.LastIndexOf("COM") + 3, 1));
     }
}

It works, but it takes over 6 to 10seconds to get the port number! Are there any faster way of getting Serial Port number provided by specific manufacturer(for example, FTDI usb serial port)?

I am able to get the serial port number by searching registry "\HKEY_LOCAL_MACHINE\HARDWARE\DEVICEMAP\SERIALCOMM". However, it does not give manufacturer information but only port number.