Python’s GC discussion balances shorter pauses against retained memory

Python reverted its incremental garbage collector during 3.14 development after memory-pressure problems, according to this Language Summit report. A new proposal combines young and old generations with incremental scanning, aiming to shorten pauses without retaining too much garbage. This is a design discussion, not a shipped feature: Python still primarily uses reference counting, with garbage collection handling cycles.

Python Software Foundation · Sep 30, 2026

Why it matters

The report explains why a latency improvement can create a memory regression in real applications.

More context

Watch the proposal and test representative memory-heavy workloads when an implementation becomes available. The discussion calls for pathological cases as well as conventional performance benchmarks.

Keep in mind

Proposed generation sizes and scanning rules may change before any release.

Original read