Have you continuously played since you joined last year, or have you recently started to play again? If the former, since when are you experiencing this? If the latter, what has changed on your machine during your break?
In October last year Crate upgraded the renderer to DX11 with V1.0.2.0. That was a bit before your previous post. Some people have issues with it and needed to switch back to DX9. Does it improve if you add /d3d9 to your launch options?
So much for a start. More tech-savvy folks might be able to assist you better than I.