Bug report #18341
VRT loads extremely slowly
| Status: | Closed | ||
|---|---|---|---|
| Priority: | High | ||
| Assignee: | - | ||
| Category: | Rasters | ||
| Affected QGIS version: | 3.0.0 | Regression?: | Yes |
| Operating System: | windows 7 pro | Easy fix?: | No |
| Pull Request or Patch supplied: | No | Resolution: | no timely feedback |
| Crashes QGIS or corrupts data: | No | Copied to github as #: | 26231 |
Description
Opening a VRT layer takes a lot of time on version 3.0.
tested on a 341ko file that references 273 ecw files :
- time on QGis 2.18.16 : 00:36:21
- time on QGis 3.0.0 : 12:26:24
History
#1
Updated by Giovanni Manghi almost 7 years ago
- Priority changed from Normal to High
- Status changed from Open to Feedback
#2
Updated by Giovanni Manghi over 6 years ago
What about 3.2? any chance the dataset can be shared?
#3
Updated by Alexander Bruy about 6 years ago
- Resolution set to no timely feedback
- Status changed from Feedback to Closed
Closed for the lack of feedback. Please reopen if necessary.
#4
Updated by Alain FERRATON almost 6 years ago
according to my tests.
during the first opening QGIS calculates statistics for the VRT which is very long. He adds them to the VRT when closing.
It is possible to pre-calculate the statistics with
gdalinfo -approx_stats My_vrt.vrt