Print composer performance at startup

[qgib]

Author Name: Reinhard Reiterer (Reinhard Reiterer)
Original Redmine Issue: 15193
Affected QGIS version: 2.18.4
Redmine category:map_composer/printing

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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?

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• composer.mp4 (Reinhard Reiterer)
• composer.qgs (Reinhard Reiterer)
• composer_svg_export.mp4 (Reinhard Reiterer)

[qgib]

Author Name: Reinhard Reiterer (Reinhard Reiterer)

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

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• 10125 was configured as composer_svg_export.mp4

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• composer_svg_export.mp4 (Reinhard Reiterer)

[qgib]

Author Name: Nyall Dawson (@nyalldawson)

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

[qgib]

Author Name: Reinhard Reiterer (Reinhard Reiterer)

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

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• fixed_version_id was configured as Version 3.0

[qgib]

Author Name: Kilian Hagemann (Kilian Hagemann)

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I think this is a duplicate of #19203, perhaps the OP could confirm this

[qgib]

Author Name: Giovanni Manghi (@gioman)

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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!

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• status_id was changed from Open to Feedback
• version was changed from 2.14.3 to 2.18.4
• fixed_version_id removed Version 3.0

[qgib]

Author Name: Nyall Dawson (@nyalldawson)

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Maybe slightly better in master, but I've got some big fixes for this coming soon (next 2 weeks). Until then we should leave this open.

[qgib]

Author Name: Giovanni Manghi (@gioman)

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• status_id was changed from Feedback to Open

[qgib]

Author Name: Nyall Dawson (@nyalldawson)

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Fixed in changeset "c60a73cb9a6bd552a0991614aa7993b2fcd20f1f".

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• status_id was changed from Open to Closed