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#number of objects

client-side aggregation

server-side aggregation
  via hash table lookup

server-side aggregation
 via hash table forEach

server-side aggregation
  via Log traversal

10.000

49 ms

1 ms

147 ms

34 ms

100.000

489 ms

27 ms

1330 ms

296 ms

1.000.000

4913 ms

274 ms

15698 ms

2901 ms

Scalability of aggregation operations with increasing selectivity

Image Added

Conclusions

This previous benchmarks allow the following conclusions:

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