Since I've been running a lot of the event dungeon this week, I figured I'd capture some data on the haste proc rate when it is an "affix" as the fourth stat on a rune. After over 100 runs and over 600 attacks, it appears that the proc rate for haste is only around 5%. So it procs only about 1 time in 20 attacks.
- this seems very low to me, so I'm curious if this is intended to be that low or perhaps there is some issue. The proc rate for other similar affixes, such as burning skin, electric skin, poison skin, etc. appear to be much higher than 5%, so was just curious. If 5% is the intended rate, it hardly seems worth equipping on a hero unless the rune is otherwise something you would equip anyway based on its other stats.