Bitmap routine for VFD display 20ms

I just threw together a few bitmaps and ran a loop to test it out. Here with 20ms pause between updates. Other video shows same routine but with 2ms pause. HERE: http://youtu.be/Cd97LevOV0E

I am trying to make my own graphic display controller using a PIC microcontroller. The built in controller of this Noritake 140x16J-7003 isn't all that great. I need to be able to update the display in as close to real-time as possible but using the display's scroll command will prevent you from sending anything new to the display until the scroll function has come to an end.

Might be ok for some uses but not if you want to use any user inputs to alter the display (if using the display scroll function that is) ... https://www.youtube.com/watch?v=gB5w5KtwYQg