omniscale/imposm3 — pull request #29 by bdon (2014-06-25 16:13:28+00:00)
Title: Use all cores for Finish, Generalize, Optimize steps.

I noticed a ~20% total speedup when using 4 vs. 2 for these steps on my 4-core machine, with a small extract (sf-bayarea). Any reason not to bump this up to `numCPU`?