Animation curves all jagged

Hi everybody,
i ve this issue in an animation that i m doing, the curves from the animation are all jagged and because of that animation is kinda laggy as you can see.
i suspect that the problem might be the difference of scale between the objects in the scene… how can i fix this?
Thank you all.

Delete all keyframes in between and set the start/end curve points to be bicubic. Then fine tune the curve to look somewhat similar to where the dots used to be.

There are no key frame in between the start and the end… only one in the beginning and one in the end.
Thank you for the answer.