Haste stacking odd

[Glitzerbling]

Moderator note: moved to Q&A.

Hi

The other day i checked out of pure curiousity, how high my haste gets under the effects of hero and Icy veins.

Turns out I have 127% haste at that point.

However, without these two effects I have 35% Haste. Now 35% +30% +30% should add up to 95% and not 127%. I must have missed something somewhere.

under TW and IV:
http://imgur.com/srKuHTC" target="_blank

under IV:
http://imgur.com/g6Mmcz6" target="_blank

under neither effect:
http://imgur.com/V0OI7Tc" target="_blank

I am probably just beeing stupid, but pls help me.

[Shadra]

It's multiplicative, not additive. 1.35 * 1.3 * 1.3 = ~2.28, or %128 increase

[kamui]

On a related note:

How does 127% translate to gameplay? I'm confused why Haste is valued so much on Frost considering that the GCD cap is 50%.

[Purplefrost]

On a related note:

How does 127% translate to gameplay? I'm confused why Haste is valued so much on Frost considering that the GCD cap is 50%.

it gives you frostbolt's that are cast faster than gcd and your ebonbolt and frost bomb are cast way faster leaving you more up time on your frostbolt/finger's rotation. I wanna say frost bomb is on gcd or within a tenth of a second and 1.5 second ebonbolt's.

I believe haste is valued because you don't need alot of crit to be able to crit on your highest damaging spells. "soft" crit cap for 100% crit chance on shatter is roughly 37% so stacking crit doesn't do anything past that mark. Haste on the other hand makes your GCD lower for faster ice lances and flurry procs, and makes your frostbolt faster so you can keep a higher uptime on your Chain Reaction stacks.

I'm relatively new to the spec so this might not be 100% accurate, but I've spent a ton of time reading about it and play testing different ideas of secondary stats trying to increase my numbers.