https://bugs.kde.org/show_bug.cgi?id=383089

--- Comment #4 from NSLW <lukasz.wojnilow...@gmail.com> ---
That's common knowledge. Please read
https://en.wikipedia.org/wiki/Spatial_anti-aliasing

and especially this

"In computer graphics, anti-aliasing improves the appearance of polygon edges,
so they are not "jagged" but are smoothed out on the screen. However, it incurs
a performance cost for the graphics card and uses more video memory. The level
of anti-aliasing determines how smooth polygon edges are (and how much video
memory it consumes)."


On your computer (and your test case) you may see no performance difference,
but user computers can be less powerful or have heavier load cases. That's why
you shouldn't enforce performance sensitive option.

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