<p>Okay, I finally got a chance to look into this.  I've refactored the <code>RangeSearch</code> class in <a href="https://github.com/mlpack/mlpack/commit/367357985828e5a007b3b9ccf6c279e983cd7fad" class="commit-link"><tt>3673579</tt></a> so that you can pass different query sets.  You can take a look at <code>range_search.hpp</code> to see what I've changed.  Can you give this a try and see if this speeds things up?</p>

<p>I'm planning on adapting the API of <code>NeighborSearch</code> and <code>FastMKS</code> too, so seeing if you have any problems here will be helpful for better refactoring. :)</p>

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