Sieg can fire Balmung faster than Saber of Black

Now then, it does have a fast activation rate for a so-called beam weapon, but in a comparison of speed, Siegfried when he was alive was the fastest in activating it, with Sieg being the next fastest and the Servant Siegfried being the slowest out of them.

Sieg possesses the “Galvanism” ability, which the Servant Siegfried does not have, and can draw out the needed prana all at once when activating the Noble Phantasm. The living Siegfried, on the other hand, had his inborn disposition combined with the transformation of his heart due to being bathed in and drinking a dragon’s blood, so he could draw forth prana and fire the slash wave even faster than Sieg. Unfortunately, the moment he was summoned as the Servant Saber, that special characteristic of his was highly degraded.