d8f4387ac9
Use a grain size for the final tree creation/balancing/lookup that depends on the average size of each tree. When the trees are larger, fewer trees are processed on each thread and vice versa. I didn't notice a difference when there are hundreds of thousands of groups, but when there are few (i.e. around the number of cores), I noticed a 6x performance improvement, from over 1 second to around 0.2 s. Note that generally the performance is better with many small groups, because the creation and balancing of trees is single threaded.
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