What is the fastest why of create a thumbnail from a video by ffmpeg or anything else in WPF C#?

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C#

WPF

ffmpeg

What is the fastest why of create a thumbnail from a video by FFmpeg or anything else in WPF c#?
look at the code in what I have tried section
it takes about 3 seconds
How can I reduce it

What I have tried:

 string Arguments = 
@"-ss " + (int)starttime + 
"  -i \"" + InputFileUrl+"\"" +
@" -y -vf scale=" + Width + ":" + Height +
" \"" + OutputFileUrl + "\"";
             
           
ProcessStartInfo psi = new ProcessStartInfo();
psi.FileName = @"ffmpeg.exe";
psi.CreateNoWindow = true;
psi.UseShellExecute = false;
psi.Arguments = Arguments;
using (Process prc_createImage=new Process())
{
prc_createImage.StartInfo = psi;
prc_createImage.Start();
prc_createImage.PriorityClass = ProcessPriorityClass.High;
prc_createImage.WaitForExit(5000);
}