it's probably why my barb feels so beefy.
my frenzy goes up to 42% IAS at lvl 20
treachery is 45% IAS
laying of hands is 20% IAS
highlords wrath is 20% IAS
for a total of 127% IAS that i already have
if i ever get super pimp add on another 60-80% from dual griefs on the fastest weapon in the game (phase blade)
i dunno what the cap was before but if it's been lifted frenzy absolutely has the ability to be ridiculous