Questions about Performance of Montage

I have some Question about Animation and Montage

  1. In below tutorial, Montage can contain Animations of Different mode.
    Editing an Animation Montage | Unreal Engine 4.27 Documentation

For Example, One Montage can contain walk slot and crouch walk slot.
And I make Start, Loop, and End sections to make walking animation perfectly.
But Each Start, Loop, and End Animation of both Walking and Crouch Walking is Different, so Section is not matched.

In this case, What should I do?
I guess using one montage is better than split it to two in performance, so Match both Slot Animation by fixing Speed.
But It makes some section Animation weird.

Should I Split it to two Montage? or Is there another Solution?

  1. I want to know the order of performance with below cases.
    (1) Using One Montage
    (2) Using Multiple Montage
    (3) Not use Montage, Use Switch and Animation Sequence in Animation FSM Directly.