Spinehail and Barrage Attack Time

Per the wiki, barrage is supposedly not adversely affected by additional projectiles. This is sourced from an old comment (supposedly) from GGG.

Attack time vs projectile count: Barrage fires 5 projectiles by default, and can be increased through various modifiers. 40% of the attack time is spent winding up, and the remaining 60% of the attack time is distributed equally between each fired projectile.[1] Additional projectiles will reduce the time between each fired projectile and increase the number of hits per second, but has no impact on the overall attack time.

This seems to be true if you use something like LMP or GMP, though I haven't tested with more sources of additional projectiles (like +arrow bows/quivers/passives).



However, when using the new Spinehail quiver, these additional arrows appear to be increasing the attack time and it seems to have weird interactions the more "real" additional arrows you have. Notably the more "real" arrows I have, the lower the final barrage attack time, adding GMP made it faster and then LMP on top made it faster still.

Video of the above testing. Testing was done by holding left click move and pressing barrage, meaning I should move automatically once the attack is completed. It was also done with Widowhail, which is why I have so many extra arrows, though I believe you get a similar outcome with a normal bow, just to a lesser degree since you only add at most 3 arrows.

https://streamable.com/jwcd5m
https://youtu.be/EZhcNWbbYzo

Something I haven't tested was Gluttonous Tide, since that is also a conditional arrow increase, though I don't currently have the means to easily test that.

Edit: Some quick rough math seems to show that the additional arrows have an attack time equal to the original arrows, rather than modifying the "60% of AT" to be faster. Eg. with 5 arrows and 0.48 AT, each arrow effectively has an AT of 0.6 * 0.48 / 5 = 0.0576s. Firing 15 arrows (Just Quiver) would take 0.864s + the 40% windup = 1.056s, which is roughly in line with my testing.

That would also explain why adding GMP/LMP makes the overall time faster, as the effective AT of the "real" arrows is also faster.