Unfortunately, no haste gear has been dropping for me and so I am currently sitting at 18%.
For a rough estimate (haste %) when did you find yourself able to get out doom, imps, stalkers, and grim (with empowerments) to get full usage of your artifact.
As it is now, i cant buff my pets if i want to use my artifact since id have sub 2.0 seconds left on grim and imps.