"The biggest change to come to Python in a long time is the free-threaded build of Python. While free-threaded Python existed in 3.13, it was considered experimental at that time. Now in 3.14, free-threads are officially supported, but still optional. Free-threaded Python is a build option in Python. You can turn it on if you want to when you build Python. There is still debate about turning free-threading on by default, but that has not been decided at the time of writing of this article."
"Another new change in 3.14 is an experimental just-in-time (JIT) compiler for MacOS and Windows release binaries. Currently, the JIT compiler is NOT recommended in production. If you'd like you test it out, you can set as an environmental variable. When running with JIT enabled, you may see Python perform 10% slower or up to 20% faster, depending on workload."
Python 3.14 adds optional free-threaded builds that enable multi-threading without the previous experimental constraints. An experimental just-in-time (JIT) compiler is available for macOS and Windows release binaries and can produce workload-dependent performance changes ranging from 10% slower to 20% faster; the JIT is not recommended for production and cannot be used with free-threaded builds. Native debuggers and profilers (gdp and perf) cannot unwind JIT frames, while pdb and profile work. The standard library cleanup includes removals and deprecations. Releases are signed with Sigstore materials instead of GPG for 3.14 and newer versions.
Read at Mouse Vs Python
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