Quick answer: Unity FSR2 upscaler producing motion blur on fast camera moves? Motion vectors aren't covering the full frame - enable Motion Vector For Per Object Motion on dynamic objects.

FSR2 looks great on stationary scenes. Sprint mode: image smears like cheap motion blur. FSR1 doesn't have this problem.

Enable per-object motion vectors

On dynamic MeshRenderers, Motion Vectors = Per Object Motion. FSR2 needs accurate motion data to dejitter; without per-object vectors, fast objects smear.

Verify the motion vector buffer

Frame Debugger > FSR2 Pass > Inputs. Motion vectors should be visible as colored streaks following dynamic objects.

Tune Camera Motion Vector Generation

For first-person, set Camera Motion Vectors to Camera and Object. Pure camera-only vectors miss head bob and weapon sway.

“Upscalers reconstruct from motion vectors. Bad vectors, bad image.”

When FSR or DLSS produces an artifact, check motion vectors first. They're the single biggest cause of upscaling artifacts.