Reduce unnecessary allocations and sorting to improve performance #41
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As shown in the pprof graph to be attached in the pull request,
the previous implementation has the following time spent:
gcBgMarkWorker 24.37%
mallocgc 15.21%
sort.Sort 9.06%
gcWriteBarrier 7.2%
which adds up to almost half the running time.
The pprof graph after this change (to be also attached) shows that these memory allocations
and sorting operations are indeed reduced.