It's possible to measure how much data retrieval takes and how much rendering takes?

[EmilianoSandri]

I'm developing an application based on node-mapnik and PostGIS but I'm experiencing some performance issues, in order to investigate these I'd really benefit from a way to measure how much data retrieval takes and how much rendering takes.

Apparently a (now deceased) fork of mapnik and node-mapnik supported this in the past but it did trough significant modifications to both packages which don't exist in upstream mapnik/node-mapnik

CartoDB#8 (comment)

I'd like to know if there's a way to get this kind of data on the current version of mapnik/node-mapnik.