Slideshow FPS and memory Leak

So for the last few months i team up with a pair of friends and we face down large and large groups of baddies.

But one of my friends has been getting late game lag spikes where his frame rate drops to that of a sloth's power point presentation, while spiking his vRam

He's got a Ryzen 9 3900x, a Zotac GeForce RTX 2080Ti (12GB), and 128gb of ram.

I'm not seeing the lag either on my older R7 3700x/RTX2060ko rig or my newer R7 9800x3d/rx9060xt rig, and our 3rd is on a laptop.

any help would be nice