[eluser]TheFuzzy0ne[/eluser]
It's very hard to tell. In fact I don't even think there would be any noticeable improvement on performance unless you had thousand of rules or more to add. Even then I doubt there would be much difference. There are so many variables to take into account, however.
You're best bet would be to carry out some tests and perhaps let us know your findings? I know that I, for one, would be interested to know.