>Is there any good websites for this?

You may want to check out the Transaction Processing Performance Council.

>Do they include VFP in any benchmarks?

NO. In fact, the benchmarks are DB neutral. However, that is not to say you can do this stuff with VFP. Remember, VFP is NOT a server database. It is a file-based. The benchmarks are concerned with DB's like SQL Server, Oracle, Sybase, etc...