perf: optimize getSlots

[lpatiny]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.45%. Comparing base (80cf6dd) to head (764608a).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #412      +/-   ##
==========================================
+ Coverage   97.42%   97.45%   +0.02%     
==========================================
  Files         216      216              
  Lines        4353     4362       +9     
  Branches     1102     1102              
==========================================
+ Hits         4241     4251      +10     
+ Misses        109      108       -1     
  Partials        3        3              

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