Actors animation - speed by velocity multiplier does not work.

[tyFlow]

The problem is that your actor root particles have no velocity - only the rig particles have velocity (the PhysX bones driving your meshes). And since the Actor Animation operator measures the velocity of the root particle for the relative speed calculations, and your root particles have no velocity, there is no speed adjustment.

There are probably a variety of ways to tackle this issue, but a really quick/hacky one is to just leech the speed for your root particle from the nearest rig particle. Attached shows how to do this, using targets.