Solid shape pixelation bug?

[The Cathedral]

Having an issue where solid shapes show up pixelated near the edges. I originally though this was an issue with my screen, or my resolution, but after using the pathfinder>exclude option I ended up with the second image. Any ideas on what the issue could be? The lines are selectable individually, as if it were a 16-color image trace of a real photo or something.

[Bill Silbert]

Turn off GPU Performance. Click on the rocket ship in the top Illustrator menu.

[Mohammad.Harb]

this could be the Graphic Card, Try ctrl + E

[Ray Yorkshire]

In addition to the above answers you may find this Adobe help page useful

Troubleshoot GPU performance in Illustrator

[Ton Frederiks]

From the Pathfinder menu, try to increase the Pathfinder Precision setting to something very small like 0,001

[Ton Frederiks]

And for the first problem, as recommended by others, check the GPU preview.

And check your video card driver:

https://illustrator.uservoice.com/forums/601447-illustrator-bugs/suggestions/20444446-font-edges

[ceyhun_akgun · Accepted solution]

I turned this option off.

GPU Performance

[marieb52016052]

thank you. this worked for me.