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 <sjfingarfi...@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. > > > _______________________________________________ > Qgis-user mailing list > qgis-u...@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/qgis-user >
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