svenkeidel/gnome-citadel — pull request #18 by markus1189 (2014-09-10 17:35:23+00:00)
Title: Actually cache the calculated reachable relation

Previously, the closure inside the TaskManager's _reachableBy field did
compute the whole Set (Actor,Task) on every call.

The new benchmark is much more promising: 133.0 ms.