@kbrossard - That eval is streamable, and you'd just build it into the data model definition itself at the deepest level that you'd need to use it. Presumably, responseTimeMS is built into your RootObject, and it doesn't look like you have any intermediate levels, so I'd be looking to put the new field in there. All the places that responseTimeMS is in the pivot language, you'd use the new field name, and adjust the sort and numcols accordingly. ... View more