Log in times for switching accounts

I don't know if any one has talked about this, I haven't been on the forum for a while now, so I'm just going to bring it up. I have 12 accounts I play in one faction and I just about quit playing last year because the transfer times between accounts literally went from 13 seconds to sometimes over 45 seconds. This made events like frontline completely unbearable. I just stopped playing for months because of the frustration. It happened after an update and hasn't gotten any better. I started playing again but way less than I was. I mostly just log in and might fight one or two battles at the most. Can anyone explain to me what happened.