Any lag I had before this patch is gone, so I don't think it has anything to do with the datacenter restructuring.
Just because it's not worse for you doesn't mean it's not worse for people on other servers. I've noticed a big degradation in performance on Tonberry, connection chunking in dungeons, got a random 90k just standing around last night. All is not well on Tonberry.

NOTHING has changed for the actual data centre you're on, this seems to be a personal issue with either your own hardware or ISP.
AGAIN. Just because you haven't seen it doesn't mean people on other worlds aren't experiencing it. It's noticeably worse on Tonberry after the patch.

Maybe it's got a lot to do with the influx of players coming back, but honestly, by now the servers should be handling the load that gets thrown at them. It's pretty obvious they're falling short on a number of worlds.