[Qgis-developer] [Qgis-user] Poor performance with large projects

[Luca Lanteri]

I can confirm this issue. I've the same problem when work with my complex
projects.
I'm not a developer so I can't propose a solution but I'm available for
testing.

Luca

2015-02-06 9:52 GMT+01:00 Sam Ingarfield <sjfingarfield at gmail.com>:

> Hi Everyone,
>
> I have been suffering from *very* poor performance on a number of
> projects, which only seems to become noticeable on large, complex projects.
> I have filed a bug with regards to this, see
> http://hub.qgis.org/issues/12125. Giovanni suggested I cross-post on the
> developer and user lists to see if others are experiencing the problem/have
> any ideas on what's going on.
>
> The issue I am experiencing manifests in two ways:
> a) Very slow project loading times (>30mins at times). Someone on the bug
> tracker suggested that this may in part be related to the retrieval of
> extent and geometry from postgis layers. I've had a look at the debugging
> logs (from the master build) and this seems to be the case, for what I
> estimate as about half the loading time.
> b) Very slow addition and removal of layers after the first save event.
> From a quick look at the debug output, it seems that after the first save,
> the entire project is being reloaded on each layer addition/removal, which
> takes a very long time. Before the first save event, performance is very
> good, addition and removal of layers is virtually instantaneous.
>
> Obviously long project times are annoying but manageable, so long as I
> only have to load the project infrequently. The second issue, however,
> makes Qgis pretty much unworkable and leads to very long times between
> saves (and the inevitable quit & reload to restore performance) which is
> poor practice.
>
> To give you an idea of the difference between pre and post-save behaviour,
> Qgis emits about 850 lines of debugging output pre-save, rising to over
> 430,000 lines post-save when adding a layer to one of my projects.
>
> Am happy to share debugging output with a developer off-list if that would
> help nail down what is happening and could lead to a fix.
>
> Cheers;
> Sam Ingarfield.
>
>
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