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

[Anita Graser]

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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