It's not you, they are limiting logins, so the stress on the server just doesn't exist.
Me and my wife both got a whole bunch of 90k's earlier this week, when it was stressed. However now that they restrict logins (1017) that stress is gone and so are the 90k errors.
I run a good system, she however has a horrible laptop and I'm happy to say even then, has gotten no lag at all. Nothing on her end goes wrong except graphics crashes when a lot is going on.

Not saying your tinkering didn't help, it would have improved things none the less, however not responsible for the halt of 90k.
Them keeping half the damn population out of the game is responsible for fixing it.