As discussed in the mailing-list (http://groups.google.com/group/pylons-discuss/browse_thread/thread/1939cb1012e2190f), any request will block Waitress, which means that other concurrent requests will not be processed until the previous one has returned.
The attached changes provide a possible fix and a test. I do not know whether this change has negative side effects (but other tests still pass so we could pretend that nothing has been broken ;) ).
Fix bug that caused slow requests to block the processing of other co…
Ha, I just finished writing very similar code, checked in as 7fa8ef4 . Thanks for this though!
Fixed by commit #7fa8ef4d9410b83237dfd11f0700d3117eeb9b27