>>272809729
Their paper has their opinion:
https://www.markussteinberger.net/papers/HumanUpperBodyIK.pdf
>Although many par ticipants thought that both conditions are indistinguishable “Were the modes the same?”, some participants commented that motion capturing felt a bit “sluggish” or “slightly slower”. An in-depth analysis of the motion capture data shows that the captured data is accurate and there seem to be no tracking issues. However, due to the technical setup, which ran the motion capturing on a dedicated server,motion capture arms introduced an additional delay due to network transmission. Precisely measuring the network delay turned out to be difficult, but we were able to narrow it down to approximately three frames of the HMD (22 ms to 33 ms). In contrast,the delay introduced by the motion controllers is a single frame. In some cases, when Optitrack has difficulties to track the markers,the delay can increase by another two to three frames. We believe this delay to be the reason for the slightly better performance of IK over motion capturing, especially in a game that requires very fast motion.