openlayers/ol3 — pull request #655 by twpayne (2013-04-25 12:44:33+00:00)
Title: Scale tile queue according to number of sources

@gjn [reports](https://groups.google.com/d/msg/ol3-dev/dZCj_kwaZS8/GLaoR6a8YuEJ) that this significantly improves performance when there are a large number of layers.