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Decreasing the load for a grid partition or merge on high traffic grids

Do we need to repartition a grid as soon as it reaches the maximum limit? We can have a cushion to let each grid grow a little bigger beyond the limit before we decide to partition it. Let’s say our grids can grow/shrink an extra 10% before we partition/merge them. This should decrease the load for a grid partition or merge on high traffic grids.

why will letting the grids grow and extra 10% before partitioning decrease load for a grid partition?