twitter/cassovary — pull request #4 by ningliang (2012-04-03 18:38:02+00:00)
Title: Use Fastutil Collections in Performance Critical Areas

Fastutil collections (http://fastutil.dsi.unimi.it/) are more efficient versions of java/scala collection classes. See the website for more details.

For this patch, I've replaced the data structures in the code paths relevant to walks and traversals with fastutil data structures.