title: Twisted threading howto avoid deepcopy
body: <p>I have a twisted server which does some "long" task for each request so i defer to thread each call. In each request i access a common resource, which gets altered during the process. Each request should start with the original data so i use deepcopy on the common resource (while invoking a lock acquire). It works, BUT i think it's not fast enough. I have the feeling that deepcopy is slowing things a bit.</p>
  
  <p>What suggestions do you have when dealing in a threaded twisted server with resources mutation ?</p>