[Qgis-user] Very slow performance with large SHP files, with over 200k objects

[jr.morreale at enoreth.net]

 On Mon, 7 Mar 2011 16:13:32 +0800, Thiru Chandran 
 <tiruchirapalli at gmail.com> wrote:
> Looks like QGIS is not able to handle very large SHP files. Here we 
> are
> talking about SHP files with over 200K polygons and the one that we 
> are over
> 500K objects.
>
> Even to open, it takes quite a long, say  more than 40 seconds.
>
> The issue is with search, if you do any attribute search then, its as 
> good
> as 5 mins to respond.
>
> I have seen some earlier threads complaining/having the same 
> problem.. well
> any patch / progress on this?
>
> this is a critical requirement in one of the application and without 
> the
> performance, we really cant make it.
>
> hope to see some light on this ... can we expect this in v 1.7?
>
>
> Richard.
>
> Northern Territory
> Australia

 Even if the threading branch brings some real improvements over 1.6, 
 you would get a better result by converting your dataset to a database 
 such as spatialite on whihc you can set indexes and spatial idx.