If you are using it for a show you would be better using a media player and play the SGU that have been rendered to video from a usb stick.
Another light weight way of doing this is open the SGU in C:\bb\BBPlugin\Files\Band-in-a-Box DAW Plugin Standalone.exe
File > Save State
Copy the C:\bb\BBPlugin\SavedTracks to your laptop
Band-in-a-Box DAW Plugin Standalone.exe
File > Load State

This way you don't need all the RealTracks and Drum on the laptop.
When they add the vol/pan slider in the Band-in-a-Box DAW Plugin Standalone should work even better.