Qgis very slow on selecting/identifing polygons with lots of vertices

[qgib]

Author Name: Pietro Rossin (Pietro Rossin)
Original Redmine Issue: 5831
Affected QGIS version: 1.8.0

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Hi all
Qgis version 1.8 and master (480c860) on my desktop (xp 32bit) get very slow when a polygon with lots of vertices is selected or identified (with the "i" key) (It was the same with 1.7.4, I just upgraded).
To select/identify a complex polygon (shp file)it takes a lot of time and after the selection Qgis slows down a lot. No other action can be done before unselecting it, otherwise qgis hangs and I have to force quit it.
If the polygon with lots of vertices is unselected then qgis resumes its speed.
It happens only with complex polygons, because if I select/ident. a simpler polygon coming from the same shp file qgis works perfect.
I saw that a similar problem was with the edit vertices funcion and it was solved, I don't know if this issue is known.
Thanks for your work
Pietro

[qgib]

Author Name: Giovanni Manghi (@gioman)

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duplicate of #14665

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• resolution was changed from to duplicate
• status_id was changed from Open to Closed