Talk:Focus/@comment-24414058-20140315175334

hmmm... one focus slot every mastery rank is a little bit small, considering how long it takes to level it. i have 300+  hours of gameplay and i still am only level 10 with half the progression bar filled, even though i tend to raise my mastery using weapons i  do not really like.

What i noticed though, is that you get mastery and affinity very fast if you join highlevel defense missions in squads since all the affinity (gathered from mobs, killed by other players) is going towards all your equipped stuff instead of just the warframe and weapon you are using, like it is the case in soloplay.