medium and heavy armors

[adeyke]

I've read somewhere that medium armors have 5 % penalty for attacks speed,and heavy ones have 10 %.
If they have a penalty for attacks speed,how much do they slow attacks down,such as whirlwind or zeal?
For instance,let's say that a barbarian whirlwinds with a balrog blade which has 35 % increased attack speed ;the last breakpoint speed is reached when a balrog blade got 35 % ias (according to diablo2.ingame.de).If  the barbarian holds a medium or heavy armor,is the whirlwind slowed down ? That is,is the last breakpoint not reached when a medium/heavy armor is worn ?
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The only thing they slow down is run/walk speed.