PhysX in Arkham Origins only adds some fluttery banners in some locations and some additional smoke effects eg. when you use the electric gloves. Things like PhysX and TressFX only add a bit of extra eyecandy and don't effect gameplay. Neither is actually used all that much anymore, I think the last game to really use GPU accelerated PhysX was Batman Arkham Knight, and I haven't heard of TressFX being used in anything outside the newer Tomb Raider games.