[Qgis-user] Poor performance on Toshiba Laptop

[bernhard.stroebl at jena.de]

Dear Andrés,

I experienced bad performance only once when I had a layer (PostGIS in 
that case) containing about 50000 polygons and one large polygon in 
which almost all the others were islands. So any section of the map had 
to draw this huge polygon.

Are you working with points, lines or polygons? In case of line/polygon: 
Are there any really complex structures?
Two ideas that might enhance performance (just shots in the dark, though):
1) Use the data's CRS for the projekt (no on-the-fly projecting of 
features needed)
2) Create a spatial index.

all the best

Bernhard

Am 03.09.2011 21:12, schrieb acarvajales at fcien.edu.uy:
> Mick: I'm sorry but i don't quite get what you mean by 'breaking' down
> the file. I suspect all of this problems i'm having are indeed related
> to the file, but i just don't have enough info on how it was built. I'll
> try to get that info as soon as i can and share it with you guys.
>
> Alex: I tried what you suggested with little success (could it be that
> this repo is not working well under Natty?)
>
>
> As i told Mick, i will try to get the info as to why it's so difficult
> to work with this file (talk to my partners, or even maybe the
> institutions involved in its creation). Meanwhile, i'll tell you guys a
> little bit more of the story.
>
>
> The shape is composed of tens of thousands of 'observations' relating
> soil characteristics (e.g fertility, texture, drainage, etc.), its use,
> and other geological, geographical and environmental related variables.
> I mean to use it combined with invasive species records, in hope of
> generating models of favourability.
>
> Fearing that the problem was that there was just too much info for my
> cpu to process, i installed the 'table manager' plugin in the belief
> that by deleting the variables (columns) from the attribute table i
> would get rid of this 'overweight' data.
>
> Obviously, it didn't worked.
>
>
> Well, as i was saying, i'll try to get that file to the web somehow.
> Maybe looking at the data, will help you guys sort out what's wrong.
>
> Needless to say, i thank you both very much
>
> Cheers,
>
> Andrés.
>
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