gravitystorm/openstreetmap-carto — pull request #1132 by math1985 (2014-11-15 17:10:26+00:00)
Title: Split landcover and text-poly in high zoom (>=10) and low zoom (<z10) layer

This causes significant speed improvements in z7, z8, and z9.
For example, rendering in z7 is now more than 5 times as fast.