I don't see how this is surprising in any way - a follower is another full character added to the portfolio, and portfolios load all the characters in them when you load them. Seems obvious that the more info you have to load, the longer it's going to take, and eventually you're going to hit memory ceiling issues. With 12 followers, you're loading 13 full characters, each of which is taking an exponentially longer amount of time to load.
I'd recommend just doing separate NPC portfolios for the followers so you can load them and print them as needed.
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