Is it possible to query more than one insights metric in one API call?
For example to get the daily added likes for a page I executed the following call:
https://graph.facebook.com/_object_id_/insights/page_fan_adds_unique/day/
But I would like to have another metric, e.g., page_fan_removes_unique, included as well.
Query the insights object entirely is a possibility, but gives me too much data I don’t need, thus decreases performance.
Yes, you can run a multiple FQL query in one API call and then parse the various results.
multi query: http://developers.facebook.com/docs/reference/rest/fql.multiquery/
insights table: http://developers.facebook.com/docs/reference/fql/insights/