I'm on an iMac running Mojave, but this has been a problem for about 2 years and I'm finally just sick of it.
Here is what it looks like, another guy with the same issue posted this video.
My cursor constantly flickers and sputters in Illustrator. I've seen multiple posts similar to mine and the solution always seems to be "uninstall 3rd party web companion programs" like Lavasoft, but I don't have any of them installed.
Has there been any solution to this, or do I just have to suffer through it? Apparently this has been an unresolved issue for over 6 years.