[Qgis-developer] Testing/Master renders 7times slower than 2.2

[Anita Graser]

On Tue, Jun 17, 2014 at 6:37 PM, Martin Dobias <wonder.sk at gmail.com> wrote:
> For a good comparison, I would suggest to have a look where the
> slowness really comes from. Apart from labeling, there could be many
> more factors affecting the speed - data-defined symbology, expressions
> in rule-based renderer, used symbol layers, reprojections etc.

As mentioned on June 3rd, the problem seems to be gone in the new
versions. Of course it would still be interesting to break the
rendering time down into it's different parts.

> Generally speaking, we should try to handle the performance
> regressions more seriously - in the process of adding new features it
> is easy to introduce something that negatively affects the rendering
> speed. Radim has done some effort to build a benchmarking system for
> QGIS some time ago, maybe it is time to bring it back to life and
> start watching it more closely.

+1 for watching the rendering speed more closely when adding new
features. The standard settings shouldn't go slower if it can be
avoided.

> Btw. nice project for testing purposes. The multipolygons layer
> contains a bunch of invalid geometries, it helped to find bugs in some
> of the new features :-)

Always glad to help with some invalid geometries ;-)

Best wishes,
Anita



>
> Regards
> Martin
>
>
>
> On Sun, Jun 1, 2014 at 7:49 PM, Anita Graser <anitagraser at gmx.at> wrote:
>> Hi,
>>
>> I have a project with Spatialite and Shapefile layers and I found that
>> it's around 7times slower to render in the current test version than
>> in 2.2.
>>
>> The project is online, so you can try it yourself:
>> https://drive.google.com/folderview?id=0Bwc-5JFVTnfIZkZOM3Y0Um9jOHc&usp=sharing
>>
>> I've tried different rendering options including parallel rendering
>> but found no way to improve the rendering speed in Testing.
>>
>> I'd love to know if it's a general problem or if I have misconfigured something.
>>
>> Best wishes,
>> Anita
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