[Qgis-developer] Improving rendering speed

Radim Blazek radim.blazek at gmail.com
Mon Mar 20 11:27:08 EST 2006


On 3/18/06, Martin Dobias <wonder.sk at gmail.com> wrote:
> Hi,
>
> I've started to do some research on how to make rendering faster. My
> benchmarks and thoughts on optimizing are on wiki:
> http://wiki.qgis.org/qgiswiki/Rendering_Performance

Nice! Thanks.

| "First draw of newly loaded GRASS layer takes cca double time to complete
| (is there any caching happening?)"

I am not sure, geometry is not chached, it is always read from file.
It could be building of spatial index which is build on first
call to select(QgsRect *rect, bool useIntersect)
but 1.5s seems to be too fast to build spatial index for 30000 lines.
It sould be also simply system file cache.

PostGIS is running on the same machine? Connected via TCP/IP
or socket file?
The files are all on local disk?

Radim


> I'd like hear some feedback from you!
>
> Bye,
> Martin
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