[Qgis-developer] Slow project opening

[Craig Leat]

Hi

Tim Sutton wrote:
> Manuel Massing wrote:
>> in my experience slow loading of project files is often due to
>> thumbnail creation, which requires creating a downsampled
>> version of the file. This may be very inefficient if the input file
>> does not support overviews.
>>
>> You could try adding overviews for your input rasters using the gdal
>> utility "gdaladdo".
>
> Could I suggest you use the gdalbuildvrt tool to create a single virtual
> raster dataset. Its much more efficient and means you only need to add a
> single layer to the legend which is much easier to deal with visually.

Thanks for the tips. My orthophotos are in MrSid format and include
overviews, but I could add overviews to my topo files. I like the idea
of a VRT file being more efficient for QGIS, so I'll explore this.

It seems I shouldn't be concerned with the CRS look up failures (?)

Craig