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Usestr.translate to improve performance ofnormalize#529
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hugovk commentedJan 19, 2026 • edited
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Following on frompypa/packaging#1064, Python 3.12 and 3.13 are slower, even though 3.10, 3.11 and 3.14 are much faster. Measured with hyperfine on python.org versions on macOS:
Marking as draft for now. Details❯hyperfine --warmup 1 -r 3 \ -n main --prepare 'git checkout main' 'python3.10 benchmark_names.py' \ -n PR --prepare 'git checkout speedup-normalize -q' 'python3.10 benchmark_names.py'Benchmark 1: main Time (mean ± σ): 6.632 s ± 0.515 s [User: 6.138 s, System: 0.359 s] Range (min … max): 6.237 s … 7.214 s 3 runsBenchmark 2: PR Time (mean ± σ): 3.456 s ± 0.122 s [User: 3.257 s, System: 0.169 s] Range (min … max): 3.373 s … 3.596 s 3 runsSummary PR ran 1.92 ± 0.16 times faster than mainimportlib_metadata on speedup-normalize [?] via 🐍 v3.14.2 via 💎 v3.1.3 took 42s❯hyperfine --warmup 1 -r 3 \ -n main --prepare 'git checkout main' 'python3.11 benchmark_names.py' \ -n PR --prepare 'git checkout speedup-normalize -q' 'python3.11 benchmark_names.py'Benchmark 1: main Time (mean ± σ): 6.331 s ± 0.541 s [User: 5.415 s, System: 0.420 s] Range (min … max): 5.859 s … 6.921 s 3 runsBenchmark 2: PR Time (mean ± σ): 3.302 s ± 0.031 s [User: 3.023 s, System: 0.209 s] Range (min … max): 3.273 s … 3.334 s 3 runsSummary PR ran 1.92 ± 0.16 times faster than mainimportlib_metadata on speedup-normalize [?] via 🐍 v3.14.2 via 💎 v3.1.3 took 38s❯hyperfine --warmup 1 -r 3 \ -n main --prepare 'git checkout main' 'python3.12 benchmark_names.py' \ -n PR --prepare 'git checkout speedup-normalize -q' 'python3.12 benchmark_names.py'Benchmark 1: main Time (mean ± σ): 5.690 s ± 0.183 s [User: 5.281 s, System: 0.274 s] Range (min … max): 5.492 s … 5.852 s 3 runsBenchmark 2: PR Time (mean ± σ): 6.640 s ± 0.069 s [User: 6.169 s, System: 0.296 s] Range (min … max): 6.560 s … 6.688 s 3 runsSummary main ran 1.17 ± 0.04 times faster than PRimportlib_metadata on speedup-normalize [?] via 🐍 v3.14.2 via 💎 v3.1.3 took 50s❯hyperfine --warmup 1 -r 3 \ -n main --prepare 'git checkout main' 'python3.13 benchmark_names.py' \ -n PR --prepare 'git checkout speedup-normalize -q' 'python3.13 benchmark_names.py'Benchmark 1: main Time (mean ± σ): 5.784 s ± 0.109 s [User: 5.359 s, System: 0.253 s] Range (min … max): 5.674 s … 5.891 s 3 runsBenchmark 2: PR Time (mean ± σ): 5.957 s ± 0.074 s [User: 5.601 s, System: 0.241 s] Range (min … max): 5.876 s … 6.022 s 3 runsSummary main ran 1.03 ± 0.02 times faster than PRimportlib_metadata on speedup-normalize [?] via 🐍 v3.14.2 via 💎 v3.1.3 took 50s❯hyperfine --warmup 1 -r 3 \ -n main --prepare 'git checkout main' 'python3.14 benchmark_names.py' \ -n PR --prepare 'git checkout speedup-normalize -q' 'python3.14 benchmark_names.py'Benchmark 1: main Time (mean ± σ): 5.749 s ± 0.060 s [User: 5.442 s, System: 0.223 s] Range (min … max): 5.684 s … 5.802 s 3 runsBenchmark 2: PR Time (mean ± σ): 2.163 s ± 0.125 s [User: 1.922 s, System: 0.169 s] Range (min … max): 2.020 s … 2.257 s 3 runsSummary PR ran 2.66 ± 0.16 times faster than main |
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This is the same aspython/cpython#143660.
We can apply@henryiii's improvement to
packaginginpypa/packaging#1030 (see alsohttps://iscinumpy.dev/post/packaging-faster/) to improve the performance ofnormalizeand make it ~3.7 times faster.Benchmark
Run
Prepared.normalize(n)on every name in PyPI:Benchmark data can be found athttps://gist.github.com/hugovk/efdbee0620cc64df7b405b52cf0b6e42
Before
After
3.7 times faster.