I suppose, this "feature" is not only about poison. yesterday had large fps drops after one npc killed another with some fire spell. and after i threw a fire grenade in crocodiles. my computer had a fps shock for 10 seconds...also, sometimes fps may drop in combat after hits.
I wonder, am I the only one, who's having these issues after the last update? О_О
if not (i hope) - are these widely-reported?