AC Mirage 30fps Quality mode feels way choppier than Valhalla?

Hey everyone, I tested the 30fps Quality mode in both AC Mirage and AC Valhalla on Xbox Series X with Motion Blur turned OFF. Valhalla runs perfectly smooth and consistent. But Mirage feels like a stuttering 24-25fps slideshow. The moment I turn the camera in Baghdad, the image judders like crazy and causes eye strain. Since both games use the same Anvil engine, is this a bad frame pacing issue, or is Baghdad's density just too much for the console? Anyone else noticed this?