Optimize computation intensive lookups in the graph

[aobolensk]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 83.33333% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.61%. Comparing base (069e858) to head (70bca20).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
include/graph/graph.hpp	83.33%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #262      +/-   ##
==========================================
+ Coverage   81.54%   81.61%   +0.06%     
==========================================
  Files          49       49              
  Lines        2639     2632       -7     
  Branches     1610     1603       -7     
==========================================
- Hits         2152     2148       -4     
+ Misses        231      230       -1     
+ Partials      256      254       -2     

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