[Qgis-user] Query concerning processing times on Dissolve

[Mark Brooks]

Question
Does the dissolve process time exponentially increase with the number of
polygons being processed or is it linear?

Background
Dear All

I am using QGIS 2.14 64 on i7 laptop in particular I have been dissolving a
polygon file of around 20,000 individual polygons.

This using the standard menu

Vector / Geoprocessing Tools / Dissolve

and opting for dissolve all for the Dissolve field

Works great - it has been taking around 36 hours for 20,000 polygons.

Does the dissolve process time exponentially increase with the number of
polygons being processed or is it linear?

Its a great option but I could see that I might want to do the dissolve at
a national level and I could see my computer being tied up for a few weeks!

Thanks in advance

Mark
Edinburgh
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