Maybe I'm not reading rfc3390 right? This: "This increased initial window is optional: a TCP MAY start with a larger initial window." And specifically this:

Maybe I'm not reading rfc3390 right? This: "This increased initial window is optional: a TCP MAY start with a larger initial window." And specifically this: "MAY start with a larger initial window". "larger" than what? a.) larger than that proposed? or b.) larger than was standard before this proposal?