Dimension search is generally not an expensive feature, and adding counts to a dimension search query adds only modest costs to query processing. However, there can be feature interaction issues that increase performance costs.

In particular, Type Ahead search may impose small but potentially noticeable performance costs. Remember that Type Ahead search performs dimension search queries for each character that an application user types. Adding refinement counts to each dimension search query slows overall performance because of rapid query processing. You may have to experiment to determine whether this performance cost has any noticeable impact for your application.