Calling batch file from code

I'm attempting to call a batch file in code. I run it when the program starts and then every 10 minutes ( for testing purposes ). However, when the function is called throug开发者_高级运维h the timer it takes about 5 minutes to process it, but when I do it through start up it only takes 30 seconds.Its copying images from point A to point B on the local computer. The amount to be copied is 400 files or so.

net use t: "image source" /persistent:yes
xcopy t: "c:\images" /C /Q /I /Y
net use /delete t: 

Here is the code for the batch file.Doing net use because of problems with permissions

System.Diagnostics.ProcessStartInfo p = new ProcessStartInfo(@"c:\getDiscImages.bat");        
System.Diagnostics.Process proc = new Process();`       
p.WindowStyle = ProcessWindowStyle.Hidden;        
proc.StartInfo = p;         
proc.Start();         
proc.WaitForExit();

This is the code in c#. It works its just a tad bit slow. Any help is greatly appreciated as always.