I suspect that getting in and out of controls quickly is a symptom of good orienteering, not a cause. In other words, good orienteers have such good overall technique that they get in and out of controls quickly without any particular effort.
If that is true, putting much time and effort into becoming quick in and out of controls might be better spent developing good overall technique.
Janne Weckman wrote about the Hannu Pulli technique with a nice example from a sprint course.
Weckman's example looks very relevant for someone looking forward to the sprint race at the WOC selection races.
