Selecting many features in the attribute table is very slow

[qgib]

Author Name: Johannes Kroeger (Johannes Kroeger)
Original Redmine Issue: 15310
Affected QGIS version: 3.6.0
Redmine category:attribute_table

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Load eg. ne_10m_populated_places.shp

Open the attribute table

Click the rightmost "external" column of the table to select the first row, then scroll all the way down, hold Shift and click the last one.

On my i5 system this takes about 15 seconds until the selection appears and QGIS gets responsive again. It is even much worse if editing is enabled.

"Select all" via Ctrl-A or the icon is instant.

[qgib]

Author Name: Giovanni Manghi (@gioman)

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• regression was configured as 0
• easy_fix was configured as 0

[qgib]

Author Name: Jürgen Fischer (@jef-n)

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• category_id was configured as Unknown

[qgib]

Author Name: Giovanni Manghi (@gioman)

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Please check if this issue is still valid on QGIS 3.4.5 or 3.6.

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• status_id was changed from Open to Feedback

[qgib]

Author Name: Johannes Kroeger (Johannes Kroeger)

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Still happening in 3.6.0-Noosa.

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• description was changed from Load eg. ne_10m_populated_places.shp

Open the attribute table

Click the rightmost "external" column of the table to select the first row, then scroll all the way down, hold Shift and click the last one.

On my i5 system this takes about 15 seconds until the selection appears and QGIS gets responsive again. It is even much worse if editing is enabled.

"Select all" via Ctrl-A or the icon is instant. to Load eg. ne_10m_populated_places.shp

Open the attribute table

Click the rightmost "external" column of the table to select the first row, then scroll all the way down, hold Shift and click the last one.

On my i5 system this takes about 15 seconds until the selection appears and QGIS gets responsive again. It is even much worse if editing is enabled.

"Select all" via Ctrl-A or the icon is instant.

• status_id was changed from Feedback to Open

[qgib]

Author Name: Giovanni Manghi (@gioman)

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• version was changed from master to 3.6.0
• category_id was changed from Unknown to Attribute table

[SrNetoChan]

Confirmed the difference between Ctrl+A (5 secs to select 255k rows in my data set) and using first and last rows with shift to select everything (10 secs.)

QGIS 3.17 (3.18 RC) fba5093f18

[Pedro-Murteira]

Still valid on QGIS 3.22.3. (Windows 10)