nickva commented on pull request #3963:
URL: https://github.com/apache/couchdb/pull/3963#issuecomment-1075723247


   Trying the optimization with a production revision tree with 6638 live 
conflicts.
   
   ```
   length(couch_key_tree:get_all_leafs(Tree)).
   6638
   ```
   
   Measured time to run `couch_key_tree:stem(Tree, 1000)`
   
   ### Before this commit
   
   
   | Erlang Version  |  Time (sec) | Memory (GBs) |
   |----------------|-------|---------|
   | 20 | 221 | 1.2 |
   | 23 | 1382 | 45 |
   
   ### After this commit
   
   | Erlang Version  |  Time (sec) | Memory (GBs) |
   |----------------|-------|---------|
   | 20 | 3 | 1.2 |
   | 23 | 3 | 1.3 |
   
   In summary, on Erlang 23, we got a nice **460x** speedup and **34x** memory 
usage reduction


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