I realized that animations on Nothing OS are a little too fast, which makes them look kinda choppy or not smooth. So I tried making them slower, and trust me, it looks way better, everything feels smoother. It seems like Nothing did a good job with the animations themselves, but they just made them too fast (In my opinion).
If you wanna try it:
Go to Settings > About Phone and tap Build Number 7 times to unlock Developer Options.
Open Settings > System > Developer Options.
Scroll down to Window Animation Scale, Transition Animation Scale, and Animator Duration Scale.
Change them from 1x to 1.5x, trust me, it makes a difference.
Try it and see if it feels smoother for you!
