Search results

Free threaded scaling issues with @classmethod and @staticmethod

3.14bugs and security fixesbugs and security fixes

3.15new features, bugs and security fixesnew features, bugs and security fixes

performancePerformance or resource usagePerformance or resource usage

topic-free-threading

type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

Status: Open.

#145779 In python/cpython;

· colesbury opened on Mar 10, 2026

Remove DELETE_FAST bytecode instruction

3.15new features, bugs and security fixesnew features, bugs and security fixes

interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)

performancePerformance or resource usagePerformance or resource usage

Status: Open.

#145749 In python/cpython;

· markshannon opened on Mar 10, 2026

Some (mostly) easy ways to reduce the size of JIT generated code

interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)

performancePerformance or resource usagePerformance or resource usage

topic-JIT

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#145742 In python/cpython;

· markshannon opened on Mar 10, 2026

Excessive numbers of DEOPT_IFs in bytecodes.c

3.15new features, bugs and security fixesnew features, bugs and security fixes

interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)

performancePerformance or resource usagePerformance or resource usage

topic-JIT

Status: Open.

#145692 In python/cpython;

· markshannon opened on Mar 9, 2026

Unexpected scaling bottleneck in _PyType_Lookup / _PyType_LookupStackRefAndVersion

3.14bugs and security fixesbugs and security fixes

3.15new features, bugs and security fixesnew features, bugs and security fixes

performancePerformance or resource usagePerformance or resource usage

topic-free-threading

type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

Status: Open.

#145685 In python/cpython;

· colesbury opened on Mar 9, 2026

Extend FOR_ITER specializations to cover other indexable sequences

3.15new features, bugs and security fixesnew features, bugs and security fixes

interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)

performancePerformance or resource usagePerformance or resource usage

Status: Open.

#145668 In python/cpython;

· markshannon opened on Mar 9, 2026

Merge the GET_ITER and GET_YIELD_FROM_ITER instructions

3.15new features, bugs and security fixesnew features, bugs and security fixes

interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)

performancePerformance or resource usagePerformance or resource usage

topic-JIT

Status: Open.

#145667 In python/cpython;

· markshannon opened on Mar 9, 2026

Make size of TOS cache configurable

3.15new features, bugs and security fixesnew features, bugs and security fixes

interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)

performancePerformance or resource usagePerformance or resource usage

topic-JIT

Status: Open.

#145665 In python/cpython;

· markshannon opened on Mar 9, 2026

LOAD_FAST is not always converted to LOAD_FAST_BORROW in a basicblock

interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)

performancePerformance or resource usagePerformance or resource usage

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#145629 In python/cpython;

· bkap123 opened on Mar 7, 2026

Improve performance of PySequence_GetSlice

interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)

performancePerformance or resource usagePerformance or resource usage

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#145192 In python/cpython;

· eendebakpt opened on Feb 24, 2026

General optimisations for dict lookup/insert performance

interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)

performancePerformance or resource usagePerformance or resource usage

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#145179 In python/cpython;

· caje731 opened on Feb 24, 2026

JIT executor invalidation appears to be slow

interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)

performancePerformance or resource usagePerformance or resource usage

topic-JIT

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#144888 In python/cpython;

· Fidget-Spinner opened on Feb 16, 2026