It is possible to speed up browsing of remote shared folders, which have been customized. It is done by enabling caching of the desktop.ini.

[HKEY_LOCAL_MACHINE \Software \Microsoft \Windows \CurrentVersion \policies \Explorer]
UseDesktopIniCache = 1 (Default = 0)

More Info MS KB840309
More Info MS KB883791

Note if having placed the "My Documents" on a remote share, and have enabled caching of the desktop.ini, then it might give slow performance, because a bug in the cache process makes it cache the entire contents of the "My Documents" folder. More Info MS KB898612