How to Change framerate without re-animating

So, i just finished my animation when i realize that i set the framerate wrong. when i change the framerate, suddenly my animation is going too fast. is there anyway to set the animation with the new framerate?

The keyframes can be moved around and also scaled.

@humanartist

what if one uses NLAs?

Time remapping is a quick fix. Typically, you should manually adjust the keys though.
time_remapping