The mouse lag your getting when your stress testing could mean that your OC is not completely stable.
It only happens when Sonic Suite II is enabled - that's it. I've even tried running LinX, RealBench, CineBench, and IBT all at the same time - no mouse lag when Sonic Suite II is closed, but lag when it's enabled.
So, technically, you could be correct - but surely one would expect to see the lag regardless of whether or not one application is open.
I should add: I found other reports on forums reporting the same issue with different hardware.
AMD Ryzen R9 5900X
ASUS ROG Strix B550-E (the worst motherboard I've owned in 25 years)
Corsair H150i Pro XT 360mm
32GB Corsair VENGEANGE LPX 3600MHz CL18
EVGA RTX 3080 FTW Hybrid w/ 280mm radiator
M.2 WD 1TB SN550 | 2 * WD Blue 1TB SATA | 2 * Toshiba N300 8TB | 400TB on a 48-bay Supermicro server
Fractal Meshify 2
Microsoft Windows 11 Pro