It looks like the mod_wsgi / Apache stack I've used for years does indeed use the shared libpython described here (according to running lld on mod_wsgi.so). So

It looks like the mod_wsgi / Apache stack I've used for years does indeed use the shared libpython described here (according to running lld on mod_wsgi.so). So this compiler flag could have saved me 30% of a server - or saved my users 23% of the server processing latency of their TTFBs. Though my servers are already overprovisioned, and latency is probably more due to memory / IO and... oh nevermind. Kudos to the python devs, looking forward to more speed improvements.