Best speed for videos

[TravelingMan67]

Hi, I have been experimenting with shooting litchi missions using terrain following and speeds of the drone. At 30kph close to the ground the motion blur doesn't look good. At 5kph the videos are too long and boring.
Is there a sweet spot for speed and good video results?

 

[AnzacJack]

you could fil at slow speed and speed it up in post?
i think a lot of the photogrammetry stuff is done at about 15km/hr