Ticket #3388 (closed bug: fixed)

Opened 2 years ago

Last modified 2 years ago

Performance issue with new symbology

Reported by: zicke Owned by: mhugent
Priority: major: does not work as expected Milestone: Version 1.7.0
Component: Symbology Version: Trunk
Keywords: Cc:
Platform Version: Platform: RedHat
Must Fix for Release: No Awaiting user input: no

Description

Hi

I have some performance issues with the new generation symbology. Using a polygon layer [1] with a categorized symbology [1]. Up to a scale to approx. 1:200 there are no issues and rendering is as fast as with the old symbology. But between approx. 1:200 - 1:1 it slows down and eating 100 % CPU for half a minute sometimes even longer. This does happen on several (RedHat?, Ubuntu) Linux systems with different QT versions. On a Windows XP machine with OSGEO4W install there are no performance issue (but it fills the polygons black sometimes when zoomed in).

[1]:  http://www.catais.org/qgis/mopublic.zip

regards Stefan

Change History

Changed 2 years ago by mhugent

  • owner changed from nobody to mhugent

This might be a clipping problem. I'm currently working on a more efficient line and polygon clip (which will bring QGIS mapserver to the same performance level as other WMS servers). Hopefully it will fix this bug too.

cheers, Marco

Changed 2 years ago by mhugent

Btw., the threading branch also uses polygon clipping which solves the issue with the example dataset.

Changed 2 years ago by zicke

When will this clipping be available in trunk? I checked it with the threading branch and it's really nice.

Stefan

Changed 2 years ago by mhugent

  • status changed from new to closed
  • resolution set to fixed

Fixed with the modified polygon clipping already some time ago.

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