Slow down speed for entire animation controller

Is there a simple way to slow down an animation controller?
I know one option is to plug a speed variable into all of the states in the entire controller, but this seems kinda silly and also doesn't affect transitions.

 

When you're using Animator Controllers normally, you can just set the Animator.speed.

It's only the Playables API that doesn't seem to have a way to do it.

 

Doesn't the animator controller use playables under the hood? I wonder what Animator.speed does then...

 

It definitely does because the Playable Graph Visualiser works on it, but there are a few weird things like this where the behaviour is inexplicably different.

Try calling animancer.Playable.PauseGraph() then in Update call animancer.Evaluate(Time.deltaTime * speed). That could be how Animator.speed does it.