Model legs during stream.

So I am very new to this. Had someone create a model for me and I noticed that sometimes while like the model will lag but the game will be fine. I usually play Escape From Tarkov and Forza Horizon 6. I thought maybe it was my internet? Or maybe my my processor? I originally thought it was because my boot drive was almost full but that didn't make sense. Any advice or thoughts?

PC Specs

Mobo - ASUS ROG Strix X870E-E GAM Wifi 7

CPU - AMD Ryzen 7 7800X3D

GPU - Radeon 9070 XT