CPU churning by Body and Request Queue thread

as discussed on IRC, here's the long awaited 'official bug report' about 2.5 beta.

Whenever I run it on a server that can at times serve 1000 clients, after restart the thread name "Request Queue" starts consuming 100% CPU instantly. After a while, "Body Queue" does the same.

This ends up in a 2.2 load (15 min average) on a 4 CPU server.