In early attempts of removing GIL, atomic reference counting slows down performance by 60%. In comparison, tracing garbage collector can defer/coalesce referenc

In early attempts of removing GIL, atomic reference counting slows down performance by 60%. In comparison, tracing garbage collector can defer/coalesce reference counting. You can read more in [2] section 2.1, and this paper introduced a new referencing counting method. [1] Multithreaded Python without the GIL https://docs.google.com/document/d/18CXhDb1ygxg-YXNBJNzfzZsDFosB5e6BfnXLlejd9l0/edit#heading=h.6nk4ql5o8r2q https://docs.google.com/document/d/18CXhDb1ygxg-YXNBJNzfzZsD... [2] Low-Latency, High-Throughput Garbage Collection https://users.cecs.anu.edu.au/~steveb/pubs/papers/lxr-pldi-2022.pdf https://users.cecs.anu.edu.au/~steveb/pubs/papers/lxr-pldi-2...