[Qgis-developer] Using PostGIS on a slow connection

Mathieu Pellerin nirvn.asia at gmail.com
Mon Mar 3 04:54:52 PST 2014

Martin, maybe render caching should be turned/forced on by default on qgis
master builds right now so there can be a higher of ppl using it and
reporting possible regressions? If it's now smooth and problem-free
following mtr merge, it can be left on by default for final 2.4 release.
On 3 Mar 2014 19:43, "Martin Dobias" <wonder.sk at gmail.com> wrote:

> Hi Paolo
> On Mon, Mar 3, 2014 at 7:18 PM, Paolo Cavallini <cavallini at faunalia.it>
> wrote:
> > Il 27/02/2014 03:17, Martin Dobias ha scritto:
> >
> >> Paolo: make sure you have render caching turned on. Deactivating (and
> >> activating again) a layer should be immediate. Of course, if you pan
> >> the map or zoom in/out, everything will be re-rendered.
> >
> > Hi Martin,
> > thanks for this. It helps, but my question remains: why should we reload
> > data, just to *disable* a layer from the legend?
> In order to remove a layer from a map, you simply need to redraw the
> whole map _without_ that layer. The render caching helps by recording
> image of each layer separately, so removing a layer from legend
> requires just combining the rendered images together without the
> removed one - without having to redraw also other layers. Maybe we
> should just make render caching default.
> Regards
> Martin
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