I want to know about some charting tools, and I want to know know the efficiency of a particular tool on a large data set. Is this an appropriate question?
I can't imagine any phrasing of that question which would be appropriate for Stack Overflow. That really seems to be a task you should perform and evaluate yourself. Even more so if it ultimately boils down to a recommendation question.
Perhaps there is a topic-related chat room however. Maybe you can ask for experiences in there. Or it might be a topic fit for a site like http://slant.co