Board Thread:Versus Debates/@comment-27664734-20160123235507/@comment-734582-20160127100246

Bob1200 wrote: Well Their Probably Faster Than Haku's Senbon Considering Naruto Got Hit By I Think It Was Sasuke's Sword That They Marked? Haku was almost impossible to spot and follow without Sharingan. If haku can move and observe that fast, it would be pointless to have slow Senbon, as it would be REALLY hard to hit them when you yourself are moving fast. Especially compensating for your own movement would be impossible with slow senbon.

Therefore, it's safe to assume the Senbon move at a similar speed to Haku.

The various Shuriken in Gaiden were not moving too fast to be perceived by both Chouchou and Sarada. The implication is that the Senbon are significantly faster than the shuriken. (which i would imagine is the only reason you'd use needles over shuriken, as logically shuriken would have greater accuracy at greater range, but senbon can be thrown faster at shorter range).