@Pablo,
> If <benchmark_link> is correct ...

For some verification, I benched pyperformance on Win10 AMD64, with the Python 3.10a7 and 3.10rc2 x64 binaries downloaded directly from python.org website release pages. The results corroborate with neonene's (please see the attached file). In short, there was a 1.09x slowdown on average.

FYI, `pyperf system tune` doesn't work on Windows. So I manually disabled turbo boost and intel speedstep, but I didn't have time to research setting core affinity and the other stabilizations. Nonetheless, most of the benches were stable.

> I am marking this as a release blocker until there is some agreement.
Got it. Setting as advised.