Hello, same here.
Not sure, but it could be after windows 11 24H2 update...
CPU : 9950X
GPU : RTX 4090
RAM : 64gb
no HDD / SDD saturation.
Since some days (24H2 update ?) i have serious lags when IR is on, serious as 8-10 seconds with mouse pointer not moving, sound stopped, and whole PC stopped... Then it comes back et works fast as usual... then after some seconds, again stopped...