Bug report #15310
Selecting many features in the attribute table is very slow
|Affected QGIS version:||3.6.0||Regression?:||No|
|Operating System:||Easy fix?:||No|
|Pull Request or Patch supplied:||No||Resolution:|
|Crashes QGIS or corrupts data:||No||Copied to github as #:||23242|
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.