perf(search): reduce the influence of the stopwatch

[eguguchkin]

Fixes #158

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• I have read and followed all requirements in CONTRIBUTING.md;
• I used LLM/AI assistance to make this pull request;

[codecov-commenter]

Codecov Report

❌ Patch coverage is 92.85714% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 70.69%. Comparing base (b69a828) to head (73a52ac).

Files with missing lines	Patch %	Lines
frac/processor/search.go	92.85%	0 Missing and 1 partial ⚠️
pattern/pattern.go	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #168      +/-   ##
==========================================
- Coverage   70.72%   70.69%   -0.03%     
==========================================
  Files         196      196              
  Lines       17840    17852      +12     
==========================================
+ Hits        12617    12621       +4     
- Misses       4506     4512       +6     
- Partials      717      719       +2     

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[cheb0]

LGTM