I suspect the OP is referring to the original bug report thread that was posted in this sub-forum (and subsequently moved by forum staff), regarding the crashes and games hanging that a number of people reported when NFP hit.
My recollection is hazy, but I think the assertion that the NPCs completing wonders is linked to the crashes / hangs was made in that thread (though I may be mis-remembering that they were posted on various Steam pages instead). My own belief is that if it is related it's not the only cause as I frequently get crashes on turns when no-one builds a wonder.