speed up my ado conn access an server dir

[luca90]

...
Set CNSQL = New ADODB.Connection
CNSQL.Open "Provider=Microsoft.Jet.OLEDB.4.0;" & _
"Data Source=C:\DB_PAS_DUE.mdb;"
....

i use this ADO conn to point on my local c:\ and all work very fast...
but if i copy the same mdb on a server dir, the operation to read and write in table of mdb are very very slow...
Peraph is a question of server, or cursor type not set, or ?????