gh-148706: Pure-Python pickle._Pickler can be significantly optimized#148707

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mjbommar wants to merge 9 commits intopython:mainfrom

mjbommar:exp-pickle/4-pure-python-exact-containers

Commits on Apr 17, 2026

pickle: add exact-container fast paths to pure-Python _batch_appends / _batch_setitems
mjbommar
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pickle: inline frame-check and short-circuit common atomic types in save()

mjbommar
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claude
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pickle: add Misc/pickle-perf-diary.md + raw bench data

mjbommar
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claude
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pickle: fix large-dict mutation semantics; reorder save() fast paths (F1)

mjbommar
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claude
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pickle: cache BININT1 opcode bytes for n in 0..255 (F4)

mjbommar
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claude
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pickle: inline the MEMOIZE proto-4+ path in memoize() (F2)

mjbommar
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claude
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pickle: extend save() fast path to bytes (F6)

mjbommar
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claude
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pickle: update perf diary for round 2 (F1-F6) + raw data

mjbommar
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claude
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Commits on Apr 18, 2026

gh-148706: add NEWS entry for pickle._Pickler optimization
mjbommar
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