Related - there's a Guinness record for the fastest Rubik's cube solving robot; it stands at 103 milliseconds:
https://www.youtube.com/shorts/ue2gZ2vxs48
https://engineering.purdue.edu/ECE/News/2025/purdue-ece-stud...
https://www.youtube.com/shorts/ue2gZ2vxs48
https://engineering.purdue.edu/ECE/News/2025/purdue-ece-stud...
Second, nanosecond? You know that a GHz CPU does a single clock tick in one nanosecond, right?