Beamng performance issue need help asap

Hey guys.

I got and issue, im playing on the italy map with ai traffic and my game stutters.

Im on medium settings in 1440p and my specs:

Amd ryzen 7 5800x

Rx7700xt

32gb ddr4

My avg fps is nat that bad but my 1% lows are terrible. My game is not smooth and i have micro laggs. (Only in beamng)

And only the game uses half of my pc.