I don't know but I am sure it is only me experience the usual "pre maintanance lag". I have skill resets and latency like hell randomly not coming from my internet.
In raid we currently have days with 5 people lagging so its pretty annoying to progress stuff.

I know it hits those with "bad" internet first and some might not yet notice that but the game is also bugging out a lot:

E.g.:
- log in and log out messages (FC) don't show randomly
- party join/leave messages are missing randomly
- on unspoiled nodes I had instead of "You no longer sense..." I got a message with a new position and it showed on map like half a sec in new pos and then vanished
- random game kicks
- general skill resets or not activating of skills at all (crafting >.<)
- the undieable golem in T9 (idk if related)

I am pretty sure to set down servers like during maintance it could fix a lot.
Well maybe I will get the anger of too many mainance with this post but it is getting annoying for me at least and I fear waiting until 23rd will make the game unplayable during raid :/