The sign-in process finishes when the surrogate
is initialized and the user is connected to the surrogate. In
this experiment, five mobile users repeatedly join the system
and log off as soon as the respective surrogate is initialized.
We inject JavaScript snippets into the client of CloudMov on
the mobile device to record the timestamps during the sign-in
process. Fig. 9 shows the average sign-in latencies experienced
by these clients during a 4.5-hour span.