Having the same issue, previous PC had it, my new one also.
Other newer and more graphicly heavy games have been running with no issues or glitches.
Running a 1080 TI with an asus 144Hz gaming monitor running freesync if that helps.
Fixing the issue? They've never even mentioned it, or confirmed that it exists.I was reading the patch notes of the forthcoming chapter. I didn't see anything mentioning about fixing this issue. I hope this fix come implicit with the next patch, in other case, this will be absolutely sloth from the devs.
Like many issues, ZOS is well aware of it. They also know how to mitigate it, but won't.
This, and many other client issues, is being caused by the continuous influx of new art assets via crafting/outfit styles, mounts, vanity pets, accessories, etc..
This is also why other bugs aren't addressed. Their engineers are constantly focused on increasing the number of items the game can handle. They do improve the client, but whatever gains are made are quickly erased by again adding more content than the client can comfortably handle.
Basically, they are sacrificing performance and stability so they can sell us more things.