If you connect on the server to localhost, is there still a problem? Are you using a GDB or FDB files extension. GDB has issues.
Also, check you just have one instance of Firebird/Interbase running. Make sure your network cables are the right ones for your network's speed. Make sure your anti-virus isn't scanning your database files (as well as any automated backup software) PS. if there are brand new machines, I'd put 64 bit windows on, then run 32 bit applications. That way your PC can utilise more memory.
