Bug report #15193: Print composer performance at startup - QGIS Application - QGIS Issue Tracking

Bug report #15193

Print composer performance at startup

Added by R. R. over 8 years ago. Updated over 7 years ago.

Status:	Closed
Priority:	Normal
Assignee:	-
Category:	Map Composer/Printing
Affected QGIS version:	2.18.4	Regression?:	No
Operating System:		Easy fix?:	No
Pull Request or Patch supplied:	No	Resolution:
Crashes QGIS or corrupts data:	No	Copied to github as #:	23132

Description

It takes a very long time to load a print composer with a few hundred items. Loading a map with 10.000+ items only takes a few seconds. Does the print composer make use of multicore processing? Is there any need to load print composers at startup?

composer.mp4 (4.18 MB) R. R., 2016-07-02 12:49 PM

composer.qgs (432 KB) R. R., 2016-07-02 12:49 PM

composer_svg_export.mp4 (3.72 MB) R. R., 2016-07-03 10:49 AM

Associated revisions

Revision 339d0616
Added by Nyall Dawson over 8 years ago

Use QgsCRSCache instead of looking up CRS by srs id (refs #15193)

Revision c60a73cb
Added by Nyall Dawson over 7 years ago

[composer] Composer windows are created on demand and destroyed on close

Avoids having to create a window and all widgets for every
composition when loading a project. Speeds up loading
projects.

Fix #15193

History

#1 Updated by R. R. over 8 years ago

File composer_svg_export.mp4 added

Opening the exported print composer (.svg) is much faster than loading the print composer in QGIS (see composer_svg_export.mp4).

#2 Updated by Nyall Dawson over 8 years ago

I've pushed a small improvement - the rest needs to wait until the API break and can't be done for 2.x

#3 Updated by R. R. over 8 years ago

Target version set to Version 3.0

Hi Nyall, is the small improvement already implemented in QGIS 2.16.0?

#4 Updated by Kilian Hagemann about 8 years ago

I think this is a duplicate of #10828, perhaps the OP could confirm this

#5 Updated by Giovanni Manghi over 7 years ago

Status changed from Open to Feedback
Affected QGIS version changed from 2.14.3 to 2.18.4
Target version deleted (~~Version 3.0~~)

Reinhard Reiterer wrote:

Hi Nyall, is the small improvement already implemented in QGIS 2.16.0?

with the provided (privately) dataset and project I was able to open it in a very resonable amount of time under Linux with 2.18.4, while on Windows (same machine) I was not. On the other hand on qgis master (qgis3) on Windows the project opens in a very resonable amount of time. I have seen this improvement in master also in other projects/tickets. I would assume that is in QGIS 3 that this issue was solved.

Nyall a word on this? Thanks!