No, it's not a big difference in speed, that is until you consider that the display in this radio isn't the Arduinos only task. I haven't started on this all just yet, but from previous projects.? In the past ,? ive found cop-rocessing with multiple prcoessors on an I2C bus to not only offer greatly improved speed up of operations, over all; it makes dividing up the project a bit easier too. The only challenge, that I ever found in multiple processors , is at start up, where you want to make sure that all the processors are talking before entering into each of their program loops . It's not that hard to code and you can find plenty of examples on how to do this.?
