is there a way to speed up the deployment of a new agent in ZCM?

I have configured ~400 Wkstn. to upgrade yesterday, today ~350 are pending.

Maybe it is urgent to remark that the regulary refresh of the Agent is
disabled at the moment. But even if a user refresh the agent manually
the upgrade will not occur.

IMHO the upgrade is a multiple step process. At first the agent will be
copied to the WkStn. and later it will be installed?!