The faster people move, the more coordination cost there is.

You have to chase your peers to coordinate to get them to do something that coheres.

People are chasing you as you chase others.

… ad infinitum.

This goes up more than linearly, because often multiple other projects depend on any individual project.

The faster things are moving, the more slack you need to absorb that extra chasing energy without transmitting it on to the rest of the organization.