2026-03-10: The original text said "Early results are modest (single-digit percent improvements)" -- implying the 3.13 JIT was already delivering gains. Changed to "Early results in 3.13 show no improvement on most benchmarks." Bad wording on my part -- 3.13 JIT shows no speedup (and can be slightly slower). The speedups are coming in 3.15: Savannah Ostrowski's preliminary FastAPI benchmarks show ~8% improvement on 3.15 (see also doesjitgobrrr.com). Thanks to Fidget-Spinner (CPython core developer working on the JIT) for the correction.
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There were two giant walls which almost touched, but not quite. Townsend remembered thinking to himself: “Why isn’t that just one wall? Why would you build two walls with enough space to squeeze through them?” The narrow canyon between the walls led to a seemingly unused space that was a couple of stories up, but didn’t quite seem to be storage or parking space. Townsend wasn’t sure what the space was doing there. All he knew was that the result was a kind of accidental room in the guts of the building, that only existed by virtue of the intentionally designed rooms around it.