Severe Lag Issues

So this started about early January if this year. the game is so laggy that i cant even move inventory items. i also have a problem with my fullscreen resolution resetting and then a box appears in the very top right corner where i can only click a back button. im not sure what is causing this and why but it makes the game unplayable.
The game lagged to the point i couldnt even close it with alt+tab.
I was trying to arrange my inventory.
the bug repeats now with severe lag no matter what i...

Severe Lag Issues