Bug#874054: Setting QT_LINUX_ACCESSIBILITY_ALWAYS_ON=1 has a huge negative performance impact, should not be always on

[Lisandro Damián Nicanor Pérez Meyer]

On 2 September 2017 at 12:11, Alex ARNAUD <alexarnaud at hypra.fr> wrote:
> Le 02/09/2017 à 16:28, Lisandro Damián Nicanor Pérez Meyer a écrit :
>>
>> I'm really open to suggestions. at-spi2-core is being installed by default
>> on
>> standard installations, so we are inflicting a huge performance drawback
>> to
>> most of our users. On the other hand people needing a11y really need to
>> get
>> this on as simple as possible.
>
>
> Primary, could you explain why you tell us that?

Because it's at-spi2-core the package which sets the variable.

> In which case you've
> noticed issue? I'm running Debian 8.9 with QT accessibility enabled without
> any performance issue.

Look at the upstream thread I linked in the first mail. Allan happens to be the
developer behind the relevant Qt code.

>> I'm pretty sure that if all the interested parties try we can find a good
>> technical solution to this.
>
>
> Indeed. I wait to reproduce and to understand your use-case before to
> participate to a debate to figure out your issue.

Basically: Qt issuing all the necessary messages for a11y in machines
not needing a11y makes a lot
of cpu power waste, whether you notice it or not.

So we have a huge user base wasting power for something they don't
need. I'm pretty sure we can find a way to
avoid that happen and at the same time letting people who need a11y
easily turn it on.

-- 
Lisandro Damián Nicanor Pérez Meyer
http://perezmeyer.com.ar/
http://perezmeyer.blogspot.com/