Bug report #21088
QGIS 3.4 much much slower to delete shapes
|Affected QGIS version:||3.4.4||Regression?:||Yes|
|Operating System:||Easy fix?:||No|
|Pull Request or Patch supplied:||No||Resolution:||duplicate|
|Crashes QGIS or corrupts data:||Yes||Copied to github as #:||28906|
As per Bug report #21085
Just noting that this is still a significant issue in version 3.4.4 (Madiera).
Deleting a small number of shapes is very slow. Deleting a large number of shapes crashes QGIS (not responding).