[boost] Boost Performance

Hi, I was looking at this benchmark https://github.com/mloskot/spatial_index_benchmark https://github.com/mloskot/spatial_index_benchmark which attempts to compare the performance between Boost and LibSpatialIndex. It caught my eye that Boost was magnitudes faster than LibSpatialIndex. Is there an obvious reason for this? Design considerations and trade offs? Thank you :) Regards, Kosen