No idea why that might be happening....but hats off to you for such a well documented report.
I had to say it :-) 2015-07-29 9:04 GMT+02:00 Raymond Nijssen <r.nijs...@terglobo.nl>: > Dear developers, ;) > > A plugin of mine imports data from a gml file into a memory layer. Works > fine for tiny gml files, but takes forever on huge ones. Sounds plausible > maybe, but the relation is not linear. > > So I did did some tests and found out that reading and parsing the gml and > creating the features always goes at the same speed of about 400 features a > second (fps). But when adding these to my memory layer, the process slows > down tremendously. > > I output the fps for every 1000 features and it gave me this graph: > > http://terglobo.nl/downloads/memory-layer-performance.png > > At the end of the importing process I'm processing just 3 features per > second. > > Is this expected behaviour? Is a memory layer not meant for something like > this? Or is this a bug? > > In the source code I found that for every feature I add to a memory layer > the index is updated. Could that be inefficient? > > Hoping anyone can explain! > > Regards, > Raymond > > > -- > Terglobo > Ampèrestraat 110 > 5223 CT 's-Hertogenbosch > The Netherlands > +31 6 25 31 49 83 > _______________________________________________ > Qgis-developer mailing list > Qgis-developer@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/qgis-developer _______________________________________________ Qgis-developer mailing list Qgis-developer@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-developer