Keyboard button presses lead to stuttering even AFTER hotfix

Update: I wasn't able to replicate the problem reliably by spamming every button on the keyboard, sometimes only movement keys cause the mouse stuttering described above.

Did some more testing: There is definitely some delay in the input processing when MSI Afterburner and RTSS are opened. I tried frantically spamming movement keys WASD and moved my mouse about: The input commands seemed to "pile up" and play out heavily delayed. My character was still moving 10 seconds after I stopped touching my keyboard and mouse.