Obviously the jittery movement occurs because when using upscale render all the movements are happening at absolute integer values and theres no smoothing between these steps what really makes this feature useless unless you are using really high pixel resolution so that the steps are smaller and not so noticeable or you make some kind of shader that smooths the movement or use this technique discussed in this thread Pixel Perfect Camera - Optimization for seamless camera movement
Though i wish unity would add some sort of movement smoothing to the upscale render feature making it usable as ive not seen any or many games use this feature because of the jitter and these threads about pixel perfect jittering keeps popping up regular basis because of it.
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