Dang, the whole idea is to minimize updates and I forgot to remove my 10Hz test. It's supposed to be 2Hz.

src/ui/flightdisplay/QGCFlightDisplay.cc

@@ -35,7 +35,7 @@ This file is part of the QGROUNDCONTROL project
 #include "QGCFlightDisplay.h"
 #include "UASManager.h"
 
-#define UPDATE_TIMER 100
+#define UPDATE_TIMER 500
 
 const char* kMainFlightDisplayGroup = "MainFlightDisplay";