Yeah, Android when it comes to “smoothness” is an enigma to me. For games it makes sense since the GPU is weak. But for browsing and stuff it should be plenty fast.
You could also try to AOT compile apps with these adb commands to maybe get better performance:
adb shell pm compile -a -f --check-prof false -m everything
adb shell pm compile -a -f --check-prof false --compile-layouts