Document grid with dots fails to render clean pixels. GPU/CPU rendering differs.
The dotted document grid renders differently between CPU and GPU modes. None of the alternatives renders perfect pixels in the selected grid color.
CPU renders vertically lighter smeared dots.
GPU renders horizontally smeared dots.
See attached screenshots.
This may relate to another bug report i've posted:
https://illustrator.uservoice.com/forums/601447-illustrator-desktop-bugs/suggestions/44269260-bug-view-grid-dots-1px-freezes-illustrator
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Mikael commented
Just an image showing how GPU preview has changed since 25.2.3 (clean pixels) to current version 26.5 (smeared pixels).