[Qgis-developer] Heatmap renderer: caching possible?

[Nyall Dawson]

On 27 November 2014 at 09:49, Andreas Neumann <a.neumann at carto.net> wrote:
> Hi,
>
> I tried the new heatmap renderer in QGIS master. It works nicely.
>
> I wonder if we could introduce a caching mechanism in a temporary raster
> layer to speed up zooming and panning? The idea would be to recreate the
> heatmap every time the project is loaded and then cache it while the project
> is open. At least as an option. For small data or smaller search radius the
> live behaviour would still work well, but for larger data sets of larger
> search radius, such a cache raster would speed things up significantly,
> especially in a server scenario.
>
> Would such a cache be technically possible and useful?

I'm not sure about a cache (would have to think about this), but try
changing the "Render quality" for the heatmap to "Fastest". That
should make a huge difference in the render speed.

Nyall