This may look familiar (Flight 1100) But this time with the DJI Spark using Litchi waypoints. I pretty much figured out what caused the slow downs and rapid spins - added waypoints to the original plot using original modes. With defaults, the Spark pauses at a waypoint unless you select curved waypoints. The added ones did not. Also the quick turns are from having "initial" selected for heading instead of changing to "auto". (Initial heading to the waypoint vs automatically facing the next waypoint)