Issues

• f_back returns None for escaped frames when caller was not materialized

  youknowone/RustPython#50 · Filter by author youknowone opened on Jul 31, 2026

• Perf: zip/enumerate/map allocate per item — no result-tuple reuse, RwLock<BigInt> counter, per-item args Vec

  youknowone/RustPython#49 · Filter by author youknowone opened on Jul 23, 2026

• Perf: hasattr/getattr miss builds and discards a full AttributeError — no suppressed-lookup path

  youknowone/RustPython#48 · Filter by author youknowone opened on Jul 23, 2026

• Perf: specialized builtin/method-descriptor call opcodes still box arguments through Vec+FuncArgs and re-dispatch per call

  youknowone/RustPython#47 · Filter by author youknowone opened on Jul 23, 2026

• Perf: split keys — shared per-class keys object + per-instance values array (inline values)

  youknowone/RustPython#46 · Filter by author youknowone opened on Jul 23, 2026

• Perf: release build config — codegen-units, fat LTO, PGO

  youknowone/RustPython#45 · Filter by author youknowone opened on Jul 6, 2026

• Perf: GC tracking takes a global lock per allocation; refcounts always atomic — free-threading-friendly mitigations

  youknowone/RustPython#44 · Filter by author youknowone opened on Jul 6, 2026
  1

• Perf: small int/float arithmetic allocates heap objects; specialized BinaryOp*Int skips the i64 fast path

  youknowone/RustPython#43 · Filter by author youknowone opened on Jul 6, 2026
  1

• Perf: instance attribute access still ~7-11x slower than CPython (specialized LOAD_ATTR does a full dict lookup)

  youknowone/RustPython#41 · Filter by author youknowone opened on Jul 6, 2026
  2

• Perf: per-instruction dispatch overhead — metadata lookups and atomic lasti cost 10–28% of runtime

  youknowone/RustPython#39 · Filter by author youknowone opened on Jul 6, 2026

• Performance: close the gap with CPython (tracking issue)

  youknowone/RustPython#38 · Filter by author youknowone opened on Jul 6, 2026