For multiplicative mining - one would take the biggest Lavishness sum of patterns sharing a single public key, and for additive mining - add all the Lavishnesses of all patterns (but also keep in mind different key generation rate for this method).
What is the difference in performance is on average? We should probably be calculating both of these options, with another ratio factor. The client should decide which method to use. This could become important when scaling up, if there is a lot of available work from different pubkeys.
Add these numbers to the new wiki page, too!
