There are two noticeable side effects of HFR. The first is that things seem to move faster. This is because your brain isn’t filling in so many gaps like I mentioned above, but honestly, this one goes away quickly. It took me maybe 10 minutes to get used to how things appeared in HFR, but once I was, I felt like I was seeing a movie for the first time.
Link: https://awesomefriday.ca/2013/01/on-frame-rates/