If the issue only happens when you move your mouse and you are using an nvidia card, downgrade your driver to version 457. I am running a 3080 and the hardware acceleration seems to be the conflict here.
Hey, check to see what driver version you have, new versions have some updates for hardware acceleration that causes lag. Aion simply does not support it for what I can tell. I downgraded to Driver version 457 and have no additional issues.