With gauges you actually get a second high speed version of the LeafSpy CAN engine which supports reading data for only the items being displayed. This can result in very high gauge update rates (many times a second) depending on what is displayed. The standard CAN engine cycles through almost all items even those not being displayed making the refresh rate in the 5 to 10 second area. The bug was caused by switching between these two engines as you changed the screen you were looking at.
Once gauges are added the new high speed CAN engine is used when a custom screen is being displayed. So custom screens without any gauges will also see a speed up depending on what is being displayed.
