Bug report #3588

new raster provider: very slow

Added by Giovanni Manghi over 10 years ago. Updated over 10 years ago.

Status:Closed
Priority:Low
Assignee:Redmine Admin
Category:Rasters
Affected QGIS version: Regression?:No
Operating System:All Easy fix?:No
Pull Request or Patch supplied: Resolution:fixed
Crashes QGIS or corrupts data: Copied to github as #:13648

Description

I'm testing the new raster capabilities of QGIS with bunch of big tiff rasters (> 1gb, sometimes > 2gb), with internal tiles and/or overviews.

What I'm seeing is that now those rasters take quite a lot (making
qgis not responsive for a while) to be rendered, before the merge it was all much quicker.

As exemple:

on QGIS 1.6 a 1.7GB geotiff with tiles and overviews opens in (more or less) 1 sec., in trunk now takes (more os less) 1 minute!

After the raster show in the canvas, also opening its properties take a long time. Before the merge was immediate.

Zooming and panning it is also much slower than before the merge.

Overall it seems like that tiles and overviews are ignored or not read, but to me seems that also opening big tiffs (> 1gb) without internal tiles and/or overviews takes a lot more than before the merge.

History

#1 Updated by Giovanni Manghi over 10 years ago

  • Resolution set to fixed
  • Status changed from Open to Closed

fixed in e59fb6b1 (SVN r15419)

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