qgis/QGIS — pull request #1020 by jekhor (2013-12-08 16:33:00+00:00)
Title: Rendering speedup

Reduce rendering time for polygons, lines and simple markers by eliminating overhead at coordinate transformation, polygons and lines clipping and simple marker rendering.

I get perfomance gain upto 19% for polygons and 15% for markers at big layers (Belarus dump of OSM).