Well, there is actually nothing else to say. I like to wait for a good moment to spawn on my squad-mate and sometimes I can watch the 3rd person camera for like 3-5 minutes. Is this time affecting my SPM [score per minute]?
I can't find official confirmation of this, but I believe that score per minute is based on the amount of time you're in-game, alive or dead. You can still score points after you die, so it seems to me that score per minute would have to count the time you wait before you respawn as well as the time you are alive.