AGS developers are years away from coding efficiency of that magnitude my man.
And yeah Decay tree is meh. Passives on the left are just too good to pass on 'em. Essence rupture I feel like is more of a PvE thing not worth taking over VB/ORB/PS/Oblivion in most PvP scenarios. Orb of Decay damage is mediocre (im unsure about the healing it actually provides) and the only thing for me that makes it strong is the armor perk it has.