Need fast help!! Beagleboard/Simulink latency issue

I am involved in a Senior Design Project at The University of Texas at Tyler and we are making an audio amplifier with digital effects using simulink with the BeagleboardXM. We have an issue with latency. There is approximately 1 second of delay even when no effects are installed. This is unacceptable and I was wondering if there was anything that I can do to remove this problem. PLEASE HELP SOON!!! The project deadline is next week

Thank you