perf: revert perf regression on immutable tree. Update docs

[sdd]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.46%. Comparing base (d8eb371) to head (2f5dbdc).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #188   +/-   ##
=======================================
  Coverage   95.46%   95.46%           
=======================================
  Files          52       52           
  Lines        6459     6463    +4     
  Branches     6459     6463    +4     
=======================================
+ Hits         6166     6170    +4     
  Misses        272      272           
  Partials       21       21           

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