Optimize repetition detection

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 71.42857% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 87%. Comparing base (e905804) to head (ed14e69).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #231 +/- ## ===================================== - Coverage 87% 87% -0% ===================================== Files 33 33 Lines 4313 4315 +2 Branches 4313 4315 +2 ===================================== - Hits 3716 3715 -1 - Misses 581 584 +3 Partials 16 16 ```

[github-actions[bot]]

Against master [hash=64; threads=1]: 🆗 Elo difference: -14.25 +/- 17.40, LOS: 5.43 %, DrawRatio: 34.70 %

[github-actions[bot]]

Against v1.5.1 [hash=64; threads=1]: 🆗 Elo difference: -3.82 +/- 17.20, LOS: 33.17 %, DrawRatio: 36.10 %

[github-actions[bot]]

Against master [hash=256; threads=4]: 🆗 Elo difference: -2.32 +/- 30.49, LOS: 44.07 %, DrawRatio: 40.00 %

[github-actions[bot]]

Against v1.5.1 [hash=256; threads=4]: 🆗 Elo difference: -18.55 +/- 30.33, LOS: 11.52 %, DrawRatio: 40.67 %