If your Little-Bits motors are running slowly, or one of the motors lags behind, here are some things you should try:

* Does your battery need to be recharged or replaced?

* Do you have more than two motors in your circuit?
If so, the power demands of the motors may require multiple power sources from splitting into two circuits.

* Can you reduce the number of motors in your design through mechanical means, such as linking components with wires or gears?