Can I use a generic proxy to speed up a connection to a server across the

I notice significantly slower performance across my VPN at peak usage
times and was wondering if a generic proxy at the remote sites would speed
things up to this Access database.

If so, what would the genric proxy look like? I do not know what ports
Access is using and I have had little luck finding them (it is going
across the VPN, so there are no discarded packets).

Any input is greatly appreciated.

Steve D.