>A customer is trying to use my VFP 9 application from a computer that connects to the server via WAN. The program runs very slow; queries take a long time. The IT person says that this facility (where PC is located) connects to the main network at 100 mb. Is it very slow? What are the acceptable speeds for a good application performance? What are the typical speeds of WAN?

The maximum speed is always the best speed.

But, I would say for now, internal network connectivity should be at 1 GB.

This architecture is pretty old now. You would probably have to see about a Web approach or something that would not add in the equation the bandwidth speed.