if you tried different antialiasing and nothing made a difference that’s good. we can rule that out.
the mem issue, that’s a separate issue. i think.
that message usually appears when one of the subsystems needs more memory.
ue adjusts mem usage so sometimes it will warn you, lower fps, and then go back up, but the quality has been lowered.
also keep in mind that the editor uses more memory than the game as it runs the editor, debug info, and the game together.
it miiiiiiight have an impact now that i think of, since you said you have 4k textures.
so low vram could affect memory streaming and virtual textures.
like i recommended before you should try to reduce the texture sizes.
8gb of vram is barely enough for ue. i think i have 8 too. i can work with it but i don’t expect a lot from it. certainly struggle with 4k textures. specially if you are using vsm, lumen and nanite which really use vram.
its a moire effect like i said. have you checked the video i’ve attached?
i would suggest you try the things i’ve detailed in the previous post. setting texture sizes, format, mipmap levels, and anisotropy which i think also might need to be set on the material. also play with the quality settings and screen percentage to pin down the root of the issue.
then improve the lods so that there is no geometry details at a distance, just a flat thing.