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"Only 35% slower overall than LuaJIT" as per video from a month ago.

No idea which kind of tests are these "overall" though.

Slides (pg. 31 performance):

I think that was a from an application of the technique to Lua from the original research paper.

The paper on copy-and-patch compilation [0] may give you a general idea although they didn't apply their technique to CPython.

From the youtube talk it will be a small improvement (5-10%). It's more of a proof of concept for future things.