system32\cmd.exe taking too long to load file

I am using the system(START Outputfile);
command in my program to display the outputfile to the screen and it is taking about 1 minute to be displayed. I would like to know what could be causing the problem.

I am letting the user input the filename, I open the file, write to the file and close file and then I use the system command to display the file. I don't know if it is related to how big the file is. I know the file is created with the results, because I see it my directory.

Also could it be I am killing a process before I call the system call. Please I need some ideas.

What is the contents of outputfile?
Why don't you use ShellExecute or ShellExecuteEx to display the file? That is the windows way of doing that.