Have a look at the sketch:
Your entity won't move along the curve, instead it will move straight from one black arrow to the next. As a result, the entity probably will not reach the maximal height (= green line) on a low framerate.


"Falls das Resultat nicht einfach nur dermassen gut aussieht, sollten Sie nochmal von vorn anfangen..." - Manual

Check out my new game: Pogostuck: Rage With Your Friends