Rapid Fire question

[icydave6691 0]

I was playing around on my hunter at the targeting dummies and noticed Rapid Fire says it " increases ranged haste by 40% for 15 seconds". I confirmed this on character sheet when I hit it, but I'm confused why the cast time for cobra shot goes from 1.76 sec to 1.26 sec which is only around a  28% increase in speed. 40% would be 1.056 secs. What am I missing?

[Orthios 271]

I'm not entirely sure how the increase in haste works honestly and am wondering the same. My haste is at 16.40% and with rapid fire only it's around 65%, with focus fire or hero/time warp it's about 58%, with rapid fire and one other it's 128%, with hero and focus fire it's 116%, and with all three it hits 208% haste. O.o with all three it should be +100% (40 from rapid fire and 30 from focus fire and hero). But instead it's close to +200%.

[Xinto 18]

Not too sure on this myself tbh. Never looked into it.

 

In terms of the 28% compared to 40% ... what are you using as the base time, if you are saying1.73 - 1.26 is a 28% difference. I believe it goes from the shots base time to reduce multiplicative effects.

[Orthios 271]

I understand how it works now: the cast time for cobra shot (or anything affected by haste) is [cast time] / [1 + haste %].

So with cobra shot, whose base cast time is 2 sec, it should be: 2 / (1 + (your haste) + haste bonuses)

The haste bonuses is where it gets weird. From what I've observed, haste doesn't stack nicely.

[LordsofAcid 0]

haste effects aren't always additive, they're multiplicative. In other words, the haste bonuses don't "stack" in a traditional sense and some don't stack at all. That's why you shouldn't use frenzy stacks and rapid fire at the same time, they don't stack. 

[Orthios 271]

I'm just going to have to get on later today and spend a good 5 to 10 min attacking a dummy to test it.