[Qgis-psc] Performance regressions (was QGIS 2.18 bug fixing effort)

[Giovanni Manghi]

Hi Nyall,

On Tue, May 23, 2017 at 8:23 AM, Nyall Dawson <nyall.dawson at gmail.com> wrote:
> On 23 May 2017 at 03:27, Giovanni Manghi <giovanni.manghi at gmail.com> wrote:
>
>>
>> rendering time:
>> real    0m38.663s
>> user    0m33.572s
>> sys     0m1.244s
>>
>> so... quite slower in rendering my test 758k ploygon layer.
>
> Hi Giovanni,
>
> I'm struggling to reproduce these rendering regressions. I've tested
> building snapshots from 2.14.0 through to 2.18.8 and for my tests the
> rendering performance has remained relatively constant throughout this
> time.
>
> This is using both a 3 million point shapefile and a 3 million polygon
> shapefile. Ubuntu 16.04, 64 bit, Release mode build using gcc.
>
> Could there be something else which is involved? Are you reprojecting
> the layers? Using labeling? Some other non-default styling?


I will make a new detailed report (eventually sharing with you my test
dataset as I cannot make it public) and see if something changed.


cheers!

-- G --