I am looking to compare the speed of the dissolve tool because the QGIS dissolve tool is performing very slow for me. However, I need to dissolve all the features into one so that I can create an outline of the perimeter of these.

The QGIS dissolve tool has this as a tick option (please see first image below).

Is it possible to do this with the GDAL UI?

enter image description here

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    Possible duplicate of Dissolve/aggregate polygons with ogr2ogr or gpc? – RoperMaps Dec 4 '17 at 14:05
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    Don't think there is such menu in the GUI. You could create a new field which contains the same value for all features (if there is currently no such field). Then use this field when running the GDAL tool for dissolve. – Joseph Dec 4 '17 at 14:13

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