I do have "Auto Upload to Controllers" set on the one controller that gives me that option (a Pi4) but, I think the problem is coming from a PixCon16. When the PixCon16 is connected, Output to lights takes over a minute to turn on. If I disconnect the PixCon16, Output to lights is immediate.
On a side note, I've noticed that I cannot Upload Output to the PixCon16. It works correctly if I manually set it up, just can't use the Upload feature. Does anyone know if that should work? Possibly just an issue with my PixCon. I tried the most recent firmware but that didn't change anything.