⚡ Faster SequenceSet#normalize when frozen#556
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November 25, 2025 18:31
Calling `SequenceSet#normalize` on a frozen set can be more than 4x
faster, by simply re-parsing `@string` and scanning its elements, rather
than fully generating a new string and comparing it with `@string`.
```
normal
reparse and check: 20449.2 i/s
generate and compare: 20267.2 i/s - 1.01x slower
v0.5.12: 3090.2 i/s - 6.62x slower
frozen and normal
generate and compare: 19328485.2 i/s
reparse and check: 17455122.3 i/s - 1.11x slower
v0.5.12: 3730.0 i/s - 5181.95x slower
unsorted
reparse and check: 16936.2 i/s
generate and compare: 16872.9 i/s - 1.00x slower
v0.5.12: 2583.6 i/s - 6.56x slower
abnormal
generate and compare: 17610.8 i/s
reparse and check: 16596.1 i/s - 1.06x slower
v0.5.12: 2560.3 i/s - 6.88x slower
frozen unsorted
reparse and check: 10089.5 i/s
v0.5.12: 2333.7 i/s - 4.32x slower
generate and compare: 2093.1 i/s - 4.82x slower
frozen abnormal
reparse and check: 10392.1 i/s
v0.5.12: 2354.5 i/s - 4.41x slower
generate and compare: 2124.3 i/s - 4.89x slower
```
Please note that these results do vary based on benchmark settings, e.g:
size of the sequence set.
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Calling
SequenceSet#normalizeon a frozen set can be more than 4x faster, by simply re-parsing@stringand scanning its elements, rather than fully generating a new string and comparing it with@string.Please note that these results vary significantly based on benchmark settings (e.g: size of the sequence set) and randomized factors (e.g: how early in the string is the first out-of-order or abnormal string).
Also, I manually adjusted the benchmark in order to compare prior unreleased commits in this branch vs this PR, because #554 also provides a significant performance boost. So "generate and compare" includes #554, and "reparse and check" represents this PR.