Conversely, if the UI lets the user manipulate the object before the lock is granted, the user will lose control once the system realizes that the user does not in fact have permission to modify the object. Some have suggested that social conventions can suffice in place of a lock, such as a convention that users not grab objects that others are already holding. However, in a collaborative environment these social conventions often break down. The actions initiated by other participants are also a source of lag, since a remote participant's actions necessarily require the potentially high-lag network transmission of information. An avatar might appear to move slowly or not at all, simply due to poor network performance.
Objects being controlled by other participants suffer from similar problems.