Processor load playing a large audio file - 40min

We use one of our nions to play house music constantly all day and it stops / starts with clock triggers. Our files are usually 35 to 45 minutes in length which is about 500 - 600mb. I notice there is sometimes a noticeable glitch or stutter in the music when I connect to the Nion with Nware. Is playing a file that large a heavy resource hog and should I look to play it from a different source? it is a stereo file.

thanks!
Gary