https://forum.flightgear.org/viewtopic.php?f=37&t=29475
That is the Anti-aliasing FXAA in your video driver.
I deliberately use it with all other anti-aliasing off, because it is light weight.
See, you better not waste your time at the wrong places
![Smile :-)](./images/smilies/icon_e_smile.gif)
Kind regards, Vincent