Disadvantages of Roaming User Profiles
Each time a user logs into a workstation, all of the files and settings are transferred over the network; the result is that the login process takes longer than if the user were to use a local profile. This is particularly the case if the profile is large in size. The login time may be reduced if the profile is cached as some files can be loaded from the local workstation and by using folder redirection to redirect folders that can grow to a large size, like My Documents, to a network share.
However, this limitation has been addressed in Windows Server 2008 Active Directory by allowing folder redirection of virtually all folders that were previously stored in a user's profile (including My Music, Favorites, and others) to a centralized and secured network share. This means that a user's roaming profile can easily be reduced to size smaller than 20MB, thus eliminating the long login times that were experienced with previous versions of AD. When using folder redirection and automatic caching of offline files, all of a user's files and preferences are available offline and synced in a much more efficient manner than previously possible when the computer is reconnected to the network using Remote Differential Compression (RDC).
Another problem is related to different set of applications installed on machines, applications stores information into Local Settings and some into the registry, but only the registry is transferred across. It can corrupt application functionality under roaming profile.
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