I just noticed that the server's notes.ini variable
ADMIN_CLIENT_SKIP_DOMINO=1
seems not work with Domino 10 anymore. I tested on V10.0.1 and the setting is defined in a configuration document. Maybe someone from HCL can confirm this issue and create an internal "case"?
Update: It seems to be Linux only, Domino 10.0.1 on Windows acts as expected.
For all who are not aware of this setting: in older versions this prevents the Admin client from loading/scanning all the useless files that are not NSF or NTF files when opening the files tab. This speeds up the user experience when working with the files section in the Admin client. Try it for yourself. Any feedback is appreciated.