R1:4a3a4fdea3a1

Make Conpherence a lot faster

Summary: Remove a sleep().

Test Plan: Thread cost dropped from ~1s to ~70ms for a test thread based on profiling after D4885.

Reviewers: btrahan, chad, vrana

Reviewed By: chad

CC: aran

Differential Revision: https://secure.phabricator.com/D4886