[Qgis-developer] reading times shapes over network difference

[Andreas Neumann]

 Hi Richard,

 I don't have a solution or explanation, but the Province of Vorarlberg 
 (which is migrating a lot of users to QGIS) has similar issues.

 I don't know if they have a solution already or if they are 
 investigating with Sourcepole.

 Andreas

 On Tue, 24 Jul 2012 09:54:20 +0200, Richard Duivenvoorde wrote:
> Hi Devs,
>
> somebody pointed me to the following observation:
>
> Opening a shapefile (375555 features, 156Mb dbf) *over a network*
> connections between two remote locations (VPN SDSL connection 10Mbps)
> seems te show HUGE differences between QGIS and other desktop gis's
> (all Windows):
>
> Opening the shape untill the full rendering:
> ( 375555 features, dbf 68 MB):
> QGIS 1.6	2'31"
> QGIS 1.8	2'30"
> ArcGIS 9.3.1	0'18"
> ArcGIS 10.1	0'17"
> DivaGIS		0'24"
>
> ( 132733 features, dbf 162 MB):
> QGIS 1.6	5'07"
> QGIS 1.8	5'00"
> ArcGIS 9.3.1	0'07"
> ArcGIS 10.1	0'07"
> DivaGIS		0'07"
>
> When you open the same files locally QGIS is as fast as the rest.
>
> Does somebody else see this behaviour?
>
> Does somebody have an explanation for this?
>
> I haven't checked/debugged into it myself, but one explanation of
> somebody was that maybe arc* and diva* only fetch the shp file first,
> to be able to render as fast as possible, and only get the dbf file
> when needed (or maybe in a different thread or so).
>
> Is that possible?
>
> Thanks for any input.
>
> Regards,
>
> Richard Duivenvoorde
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 Andreas Neumann
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 8624 Grüt (Gossau ZH)
 Switzerland