I have been experiencing lag as well. Mine began around Monday. I live in Japan and play on an NA server, but had zero latency issues before Monday. Now I sometimes have to wait 6-10 seconds for actions to process. I guess the game is still playable, but it isn't very fun anymore. I have been playing conjurer and tried doing Halatali the other day. Managed to get through it, but it really hard to heal with that kind of lag. -_- I get error 90000 a fair amount too.