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

[Anita Graser]

On 28.07.2020 22:15, Alessandro Pasotti wrote:
> Hi,
>
> Seems pretty bad, please file a ticket.

Thanks, Alessandro!

Done: https://github.com/qgis/QGIS/issues/38018

Anita


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