Guido is no longer the BDF and spoke fairly positively about this change in the mailing list thread[1].
"To be clear, Sam’s basic approach is a bit slower for single-threaded code,
and he admits that. But to sweeten the pot he has also applied a bunch of
unrelated speedups that make it faster in general, so that overall it’s
always a win. But presumably we could upstream the latter easily,
separately from the GIL-freeing part."
"To be clear, Sam’s basic approach is a bit slower for single-threaded code, and he admits that. But to sweeten the pot he has also applied a bunch of unrelated speedups that make it faster in general, so that overall it’s always a win. But presumably we could upstream the latter easily, separately from the GIL-freeing part."
[1] https://mail.python.org/archives/list/python-dev@python.org/...