So to put it another way this is the reason why Qgis wants to use a huge amount of memory (40 GB) when I have a lot of raster images loaded in the background.

On 16/11/17 18:56, Tim Sutton wrote:
Hi

On 16 Nov 2017, at 04:35, Patrick Dunford <enzedrailm...@gmail.com <mailto:enzedrailm...@gmail.com>> wrote:

What is this "preview job" function?



Its application logic to prefetch / pre-render offscreen content in anticipation of user panning the map.

Regards

Tim

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