Hi, 2 of my customers have a speed issue (very big one) when the MsAccess MDB file (Ado) is on any of their Network drive. When the MDB is on the local C: drive every thing is very quick. After moving the MDB file on the network drive it become terrible . A simple Sql query on local drive is less than one sec. and on the network drive 8 to 9 sec. Everything was ok 3 or 4 month before. No update on my side. My app was compile with Delphi 10.4 using ADO connection .