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Does anybody know if there are any improvements planned pertaining to the performance of vector files in QGIS? Right now, a 1 GB file with contour lines needs several minutes to open.

In addition to that I have the suggestion that vector-files shouldn't be refreshed in whole when panning or zooming. This costs a lot of nerves and could be avoided through a cache.

Thank you.

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Is the 1GB file a shapefile? you might be better off loading that data into postgis. –  Mapperz May 10 '13 at 14:23
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In addition to Mapperz' question about shapefiles, information about your hardware (e.g. processor speed, RAM, and video card specs) might be useful. –  user3461 May 10 '13 at 15:14
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The use of spatial indexes might improve speed as well. –  Andre Joost May 10 '13 at 17:44
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closed as too localized by underdark Jun 9 '13 at 21:20

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1 Answer

There were plans and there was a solution but it is now outdated: http://hub.qgis.org/issues/2037

Try if render caching reduces the pain. When working with bigger datasets, avoid zooming out too far - if possible - and use the possibility to deactivate rendering when possible. As mentioned in the comments, loading the file into PostGIS and adding indexes should help too.

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