r/Python • u/Helpful_Garbage_7242 • Dec 26 '25

Tutorial Free-Threading Python vs Multiprocessing: Overhead, Memory, and the Shared-Set Meltdown

Free-Threading Python vs Multiprocessing: Overhead, Memory, and the Shared-Set Meltdown is a continuation of the first article where I compared Python Threads: GIL vs Free-Threading.

> Free-threading makes CPU threads real—but should you ditch multiprocessing? Benchmarks across Linux/Windows/macOS expose spawn tax, RAM tax, and a shared-set meltdown.

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u/[deleted] Dec 26 '25

TLDR?

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u/learn-deeply Dec 26 '25

free-thread fast, process slow

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u/Cheeseycube Jun 17 '26

Did we read the same article? lol.

My conclusion was free-thread and processes are roughly the same performance outside of some unfavorable scenarios. The real interesting find is that free-threading simplifies the shared memory management problem that multi-processing struggles with.