Although I can't get into any details, we are aware of these issues in the python27 runtime. Like you noted, the runtime is experimental (hey, we've only been live for one release cycle), and improvements are still coming.
On a more general note, the python27 runtime is implemented using the CPython interpreter from python.org and hence is open to issues related to the GIL. I suggest reading http://wiki.python.org/moin/GlobalInterpreterLock to get some background into multi-threading performance issues in Python. -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To view this discussion on the web visit https://groups.google.com/d/msg/google-appengine/-/UGq2YZ9KIroJ. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
