Hi,
On Sat, 2011-02-19 at 08:18 +0100, Paolo Cavallini wrote: > Il giorno ven, 18/02/2011 alle 23.58 +0100, Martin Dobias ha scritto: > > The main performance killer here is painting of borders. The layer is > > rendered several times faster if you set border style to "no pen". > > This has no noticeable effect in my case. I made my own tests: on trunk with a big 600mb (43000 features) polygon shapefile, the vector opens in 32 seconds (new symbology, with borders, anti-aliasing disabled). After saving a style with no borders the shape opens in 15/16 seconds. The problems remain in both cases when zooming/panning as there is always a bigdelay and in between the program freezes (under Linux). Opening the attribute table or toggling editing or selecting polygons is a real pain. > > The clear direction is to merge threading branch to trunk. It contains > > some optimizations for rendering, plus it does not freeze while > > rendering and continuously updates the map. So even when working with > > huge layers, it's possible to see how rendering continues and zoom/pan > > to desired region of interest without having to wait until rendering > > of the last map finished. > > Any idea about when it will be merged? Anyone working on this? > What performance gain would you expect with threading? I tested everything again after having compiled the threading branch. The result is *much* better (with or without borders) when opening the shape and panning/zooming, and looking at the way the geomteries are painted in the canvas it seems to me that is the same approach used in gvsig. Editing/selecting is still painful (also in gvsig...). Cheers -- Giovanni -- _______________________________________________ Qgis-developer mailing list Qgis-developer@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-developer
