[QGIS-Developer] "Show selected features" is very slow in recent versions

[Alessandro Pasotti]

Hi,

Seems pretty bad, please file a ticket.

On Tue, Jul 28, 2020, 21:45 Anita Graser <anitagraser at gmx.at> wrote:

> Hi,
>
> There seems to be a performance regression concerning "Show selected
> features" in the attribute table of recent QGIS versions. (See also
> https://twitter.com/DrChrisGeoSci/status/1288120808951312389)
>
> I've tested this with the Natural Earth dataset ne_10m_populated_places
> layer. The expression "NAME" like 'A%' is close to instantaneous but
> switching to "Show selected features" takes forever and freezes QGIS master
> and 3.14 in a way that looks like it crashed (i.e. "not responding" on
> Windows).
>
> In 3.4 "Show selected features" is much faster. There's no freeze.
>
> Is this a known issue or should I open a ticket?
>
> Regards,
>
> Anita
>
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