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Rendering slow with "LIKE" in vector layer styling #433

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PeterPetrik opened this issue Aug 27, 2019 · 5 comments
Open

Rendering slow with "LIKE" in vector layer styling #433

PeterPetrik opened this issue Aug 27, 2019 · 5 comments
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@PeterPetrik
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profile ios rendering of the rasters
@PeterPetrik
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PeterPetrik commented Sep 2, 2019 •
edited

it looks like it is due to super slow regex evaluation for complex OSM-based maps with a lot of custom rule based renderings.

when nextFeature() logic for pre-filtering the features based on regex is commented out, it is even slower.

@PeterPetrik
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test project (qgis relwithdebuginfo)

  • 16k lines, 121 multilines, 51k polygons, 10k points
  • osm (all symbols as simple one color symbols): 18sek features + 100sek labels
  • osm (nice symbols with rule based stuff): 42sek features + 15sek labels
  • osm (only lines, rule based): 40 sek + 15sek labels
  • osm (only lines, simple symbol, no labels): 2 sek
  • only raster bg: 1 sek
  • osm (only minor roads, full symbology, labels): 3sek

looks like the problematic part is other_tags LIKE '%border%' OR other_tags LIKE '%boundary%'
the "LIKE" stuff

Screenshot 2019-09-06 at 10 54 51

Screenshot 2019-09-06 at 11 01 51

@PeterPetrik PeterPetrik changed the title speed up ios rendering Rendering slow with "LIKE" in vector layer styling Sep 6, 2019
@PeterPetrik
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PeterPetrik commented Sep 6, 2019 •
edited

WORKAROUND: instead of other_tags LIKE '%border%' better to use other_tags ~ 'border'

@PeterPetrik
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  • saber/osm-defultst: 30 sek
  • saber/osm-defultstyle-nolabel: 5 sek
  • saber/osm-defultstyle-nolike: 1 sek
  • saber/osm-defultstyle-nolike-tilde: ~ 2 sek

@wonder-sk wonder-sk mentioned this issue Sep 6, 2019
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@saberraz
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This has been addressed in QGIS. We need an update of the SDK.

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@PeterPetrik @saberraz