perf: Memoize duplicates in rolling-gb-dyn

[ritchie46]

Same as #19922 but for all paths.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.45%. Comparing base (05f2abb) to head (f9af61c).
Report is 8 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #19939   +/-   ##
=======================================
  Coverage   79.44%   79.45%           
=======================================
  Files        1555     1555           
  Lines      216140   216167   +27     
  Branches     2456     2456           
=======================================
+ Hits       171716   171745   +29     
+ Misses      43866    43864    -2     
  Partials      558      558           

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