D2R - lag/render issue

I start the game it works - get to main menu and its lagging like crazy.

tried to check my gpu its not my gpu it works just fine.
checked with isp nothing wrong there.

HELP! this game worked for me a week ago.

when i alt-tab out the game doesnt lag at all and returnes to normal as i can see it cause i have multiple monitors.

Oh and i even tried to scan and repair my files. it didnt work.

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