Another boring haste question

[HaruGlory]

Hi mmo-c!

I have another question concernig haste that I asked in other topic but noone answered :/ so I'll try again hoping for better luck this time.

This isn't another lame question about the (in)famous 12.5% haste cap, but it has something to do with percentages. What I would like to know is the exact amount of haste (be it percentages or ratings) that I need to reduce 0,1 seconds the casting time of my spells. I suppose that there are certain "magical numbers" which make this happen, and having a haste rating between them is a waste of stats, therefore my question.

To clarify this a little bit, what I want to know is the amount of haste needed to make my heals' casting time 2.4, 2.3, 2.2s and so on.

Thanks in advance and sorry for the bad English! It's been really hard for me this time :P.

[Wericia]

It depends a whole lot on how fast your cast is to begin with.
How to calculate haste percentage to cast time is something like this:

You've got a 2.5 second cast time without or after talent reduction, you have 10% haste (just as a example).

Say that you're chaincasting this spell for 25 seconds, just to make it easy.
10% haste will make you cast 10% more spells in this time window.
25 seconds divided by 2.5 seconds cast time = 10 spells cast.
Now, if you cast 10% more spells within this time window, you'll be casting 10 x 1.1 spells which = 11. (as 1 is base cast time, and then another .1 as you've got 10 percent haste).

Now you're gonna cast 11 spells in a time window of 25 seconds, which means that your new cast time is 25 divided by 11, which is about 2.27 seconds per spell.

Use this math and try out how many percent you need for 2.4, 2.3, 2.2 etc. In cast time.

[Jakebert]

Yeah it's a bit hard to come up with some hard numbers because haste scales, so while (using the above method, which I like) 10% haste equals a 2.5 sec cast time, 12% haste equals 2.08 sec, cast time, which to me seems like a jump. But then again... I suck at math.

EDIT/P.S.: Unless they are of this nature, let there be no more "haste/mastery" posts here. So shall it be written...

[iwco]

(2.5 sec / 100% ) . 12% = 0.3 you cannot fail

[Deleted]

Yeah it's a bit hard to come up with some hard numbers because haste scales, so while (using the above method, which I like) 10% haste equals a 2.5 sec cast time, 12% haste equals 2.08 sec, cast time, which to me seems like a jump. But then again... I suck at math.

12% gives 2.23s according to the above formula:

10 * 1.12 = 11.2 spell cast
25 / 11.2 = 2.23s per spell

[zenkai]

Some Values (rounded)

Haste%          1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20
Base Cast 	2.5	2.5	2.5	2.5	2.5	2.5	2.5	2.5	2.5	2.5	2.5	2.5	2.5	2.5	2.5	2.5	2.5	2.5	2.5	2.5
New Cast	2.48	2.45	2.43	2.40	2.38	2.36	2.34	2.31	2.29	2.27	2.25	2.23	2.21	2.19	2.17	2.16	2.14	2.12	2.10	2.08
																				
Haste%          1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20
GCD        	1.5	1.5	1.5	1.5	1.5	1.5	1.5	1.5	1.5	1.5	1.5	1.5	1.5	1.5	1.5	1.5	1.5	1.5	1.5	1.5
New GCD 	1.49	1.47	1.46	1.44	1.43	1.42	1.40	1.39	1.38	1.36	1.35	1.34	1.33	1.32	1.30	1.29	1.28	1.27	1.26	1.25

[HaruGlory]

Thank you very much for this ton of useful information! This is exactly what I wanted