<html><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:12pt"><div style="margin-bottom: 15px; color: rgb(51, 51, 51); font-family: Helvetica, arial, freesans, clean, sans-serif; font-size: 13px; line-height: 22px; background-color: rgb(251, 251, 251);">Umm, I want to test an experiment.</div><div style="margin-top: 15px; margin-bottom: 15px; color: rgb(51, 51, 51); font-family: Helvetica, arial, freesans, clean, sans-serif; font-size: 13px; line-height: 22px; background-color: rgb(251, 251, 251);">I see that qgis draws the geometries (LineStrings or Polygons) in independent calls ("painter->drawPolyline" or "painter->drawPolygon()" calls). I have experience using GDI++ as renderer and it is very faster joining n-geometries in one geometry-path and then flush this complex object to the renderer.</div><div style="margin-top: 15px; margin-bottom: 15px;
color: rgb(51, 51, 51); font-family: Helvetica, arial, freesans, clean, sans-serif; font-size: 13px; line-height: 22px; background-color: rgb(251, 251, 251);">I want check how qt-painter (or qt-image) behaves using this trick (It not is applicable in all layer styles but it is for the simple layer style). Someone knows something about it?</div><div style="margin-top: 15px; color: rgb(51, 51, 51); font-family: Helvetica, arial, freesans, clean, sans-serif; font-size: 13px; line-height: 22px; background-color: rgb(251, 251, 251);">Thank you very much.</div></div></body></html>