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<p class="MsoNormal"><span lang="EN-GB">Dear QGIS developers,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">we are facing some crucial performance issues while loading a big QGIS project.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">The project ...<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">... has 1080 layers<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">... has 167 layer groups<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">... is heavily styled (in fact, most of the information in the .qgs file are stylings)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">... has a size of 53 MB (the .gqs file)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">... loads the data from a PostGIS database
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">The main problem we are facing is, that the loading time of the .qgs file is between 10 and 15 Minutes (depending on the network traffic).<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">We don't need all the layers which are defined in the .qgs file immediately. In most cases, we just need a bunch of those layers at once.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Therefore, the question is, if QGIS provides a mechanism to postpone the initial loading of all layers from QGIS startup to the point in time when we actually need the layers? I.e., the layer structure is loaded but not
the layer data.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Is there a build-in QGIS mechanism that allows loading only the needed layers from the .qgs file and write the appropriate styles to it or is it planned to implement such a mechanism in QGIS?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal">Kind regards,<o:p></o:p></p>
<p class="MsoNormal">Josef<o:p></o:p></p>
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