The secondary roles get ridiculously expensive, they are definitely not worth leveling up if you're trying to beat the game fast. You can't even get them past level 2 or 3 until after you beat the game, and ultimately they have less nodes overall than the core roles. Regardless, it takes around 2.5 million CP to master any one role.
Upgrading weapons can be a pretty good idea, I have Lightning's Omega Weapon right now and it's like strength+600 so not bad. I found it better to just level up one weapon like crazy and then when you're done with it/can't upgrade it anymore you move to the next one. Also a good tip is if you feed one weapon 36 "vials" of Vibrant Ooze you will get bonus X 3 on that weapon, probably the most efficient way to do so. Then just give it whatever amount of items will give it the most EXP before it goes down to bonus X 1.
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