The special stages can be difficult at first, but they won't change.
It's not only a matter of speed but more of a matter of identify the pattern of rings that arrives. The easiest one is the one that alternates left and right.
In general I expect the player to miss the first line of rings, but the ones following immediately after should be easy to get if you identified the pattern type.
Jump a lot to change side quickly, don't move on the ground.
By the time you unlock Wechnia, you'll clear them with an amount of rings that is far higher than the requirement.