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Improve performance of json.dumps and json.dump for strings #156241

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Improve performance of json.dumps and json.dump for strings#156241
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extension-modulesC modules in the Modules dirperformancePerformance or resource usagestdlibStandard Library Python modules in the Lib/ directorytype-featureA feature request or enhancement

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@eendebakpt
eendebakpt
opened on Aug 22, 2026

For strings that do not require escaping we can bulk copy the data in ascii_escape_unicode and escape_unicode.

This is in preparation of addressing #129711 by creating a C implementation for json.dump.

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  1. eendebakpt
    added
    type-featureA feature request or enhancement
    performancePerformance or resource usage
    stdlibStandard Library Python modules in the Lib/ directory
    extension-modulesC modules in the Modules dir
    on Aug 22, 2026
  2. eendebakpt
    added a commit that references this issue on Aug 30, 2026

    pythongh-156241: Split quote_unescaped_unicode into ascii and unicode…

    d1e7e10
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