I was wondering on how to slow down the speed of an object following a path (that has been animated.) I'm trying to slow down how fast the UFO (with a particle system) goes along the bezier circle I've made, but I can't seem to find that option.
Parenting an object to a path keyframes and locks the evaluation time automatically. In graph editor, select evaluation time and look at its modifiers. Underneath "Expanded polynomial," activate "Additive." This should allow you to use keyframes to control the speed of the object on the path. You need not keyframe the frame count of the animation.