CPU profiling shows that computing the tagset-based key of each point is significant CPU cost. These keys actually don't change per cursor, so precompute once at mapper-open time, and then use those values as points are drained from the cursor.
Before this change the cursor tag was getting computed on every point, which involved marshalling tags.
Philip O'Toole
Philip O'Toole
Cory LaNou
Jason Wilder
Cory LaNou
David Norton
Ben Johnson