You cant adjust the speed of the animation, but you can compensate by using less frames in your animation.
What I mean by that, is you have 16 frames total for the animation sequence. If you animate all 16 frames the animation runs at warp speed.
But if you make an animation that contains only, say four different frames. you can have each frame play four times each, for the total of 16 frames, and your animation will appear to run slower.
I wish that this issue could be addressed in future updates, to give us more flexibility in the use of animations.
Hope this helps my friend.
In the Universe, nothing ever stays the same.