I'm confused. I downloaded UE5. Created starter fpp project. Built it and ran it as standalone onn dx12. Switched to fullscreen, showed fps counter (120fps on 120hz oled tv) but the "game" doesn't feel like 120fps. It feels like at most 60. And before I turned off motion blur it was really smudgy and after I turned if it's really choppy.
Can be a few things, but a lack of mouse input smoothing can be a culprit. If the viewport angle is "locked" to the mouse input ticks, it can display at effectively 60 Hz, where you'll get two identical frames per mouse movement. So 120 Hz of graphics, but 60 Hz of content.
What's happening?