Hi,
That is a lot of Style filters to be applying, Is there any way you could reduce the Categorising? The other thing is your Indexing, make sure the fields you are using in the style are indexed, along with the Geometry.
Regards,

Richard

On 14/02/2018 11:26, Enrico Fiore wrote:

Hi,
I have noticed that QGIS 2.18.16 has strange behavior, that I'm going to try to explain.

The view freezes for 3 - 4 seconds after zooming or dezooming action.
View freezing happen only if in the Project there is a specific layer with categorized style (the same layer with single simbol style doesn't cause the problem). The layer has 130421 feature (point) and 2381 items in the legend (after have applied the style) and the datasource is db (The problem raised happens both with data deriving from Oracle and PostgreSQL database).


The behaviour didn't happen in qgis 2.8.4.

Has anyone experienced the same problem ?

Can be a bug?


Enrico



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