We've noticed that Peggy 2 can give a somewhat jittery display sometimes when programmed from the Arduino environment. The reason is that there is a timer interrupt (for the millisecond timer) that happens approximately once per millisecond. If you are (1) using the "standard" Peggy 2 libraries and (2) not using the millisecond timer or other Arduino functions that obviously require interrupts, you can usually smooth things out again by turning off global interrupts.

To do this, add the following line to your setup section:

This tip should work, for example, with all example programs in the standard Peggy 2 library.