It could be that blizzard uses the DPS of your weapon instead of the raw damage, meaning that IASP would have an effect after all. Did anyone test the actual damage of blizzard with different values of IASP or was only the duration of the effect tested?
My proposal for a hydra test would be to find some very large HP mob, prefferably in a lower difficulty and see the amount of shots a hydra takes at it over it's duration (assuming that doesn't change with IASP). I'll try this myself when I have time, which is probably gonna be wednesday evening, but a second test to confirm/deny results would be nice.
Time to find some IASP rings/amulets and go back to normal for some testing I suppose...
I could be wrong, but based on observational testing when switching between my current weapon (a .9 speed 2 handed mace) and my previous weapon (a 1.5 speed dagger), which considering my other gear made a fairly substantial change in my overall attack speed of 1.2 vs 1.9, I did not notice a difference in the frequency of attacks from hydra (i.e. attack speed does not make it attack faster), but I also did not notice the massive increase in damage you would expect from switching to the much slower, higher damage weapon if IAS did not have any effect.
What I think is happening is that for fire and forget DOT spells like Blizzard and Hydra the attacks happen at the same frequency but the game utilizes your DPS to determine the damage done each tick, not your weapon damage. So in that way IAS is factored in but does not actually increase the tick rate.
Basically I just pop diamond skin on cooldown and then cast disintegrate more or less indefinitely until everything dies. Ray of Frost for single targets like elites/bosses. Passive bonuses from familiar/energy weapon and 2 active defensive skills. Diamond skin and slow time will get you out of a lot of trouble, and if there are more mobs than you can handle you drop slow time as you are running away and then turn around and disintegrate them with the 20% damage bonus while they are in the bubble.
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I could be wrong, but based on observational testing when switching between my current weapon (a .9 speed 2 handed mace) and my previous weapon (a 1.5 speed dagger), which considering my other gear made a fairly substantial change in my overall attack speed of 1.2 vs 1.9, I did not notice a difference in the frequency of attacks from hydra (i.e. attack speed does not make it attack faster), but I also did not notice the massive increase in damage you would expect from switching to the much slower, higher damage weapon if IAS did not have any effect.
What I think is happening is that for fire and forget DOT spells like Blizzard and Hydra the attacks happen at the same frequency but the game utilizes your DPS to determine the damage done each tick, not your weapon damage. So in that way IAS is factored in but does not actually increase the tick rate.
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http://us.battle.net/d3/en/calculator/wizard#ZijgXS!aYX!baaZZZ
Basically I just pop diamond skin on cooldown and then cast disintegrate more or less indefinitely until everything dies. Ray of Frost for single targets like elites/bosses. Passive bonuses from familiar/energy weapon and 2 active defensive skills. Diamond skin and slow time will get you out of a lot of trouble, and if there are more mobs than you can handle you drop slow time as you are running away and then turn around and disintegrate them with the 20% damage bonus while they are in the bubble.
Anyways its working great so far in NM